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Plant Disease Resistance-Related Signaling Pathways: Recent Progress and Future Prospects

Li-Na Ding, Yue-Tao Li, Yuan-Zhen Wu and 5 more (opens in a new tab)

International Journal of Molecular Sciences · 2022 · Review · CC BY

doi:10.3390/ijms232416200 (opens in a new tab)

Abstract

Plant–pathogen interactions induce a signal transmission series that stimulates the plant’s host defense system against pathogens and this, in turn, leads to disease resistance responses. Plant innate immunity mainly includes two lines of the defense system, called pathogen-associated molecular pattern-triggered immunity (PTI) and effector-triggered immunity (ETI). There is extensive signal exchange and recognition in the process of triggering the plant immune signaling network. Plant messenger signaling molecules, such as calcium ions, reactive oxygen species, and nitric oxide, and plant hormone signaling molecules, such as salicylic acid, jasmonic acid, and ethylene, play key roles in inducing plant defense responses. In addition, heterotrimeric G proteins, the mitogen-activated protein kinase cascade, and non-coding RNAs (ncRNAs) play important roles in regulating disease resistance and the defense signal transduction network. This paper summarizes the status and progress in plant disease resistance and disease resistance signal transduction pathway research in recent years; discusses the complexities of, and interactions among, defense signal pathways; and forecasts future research prospects to provide new ideas for the prevention and control of plant diseases.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 23, 2026. Paragraph numbers are ours, so an answer can point at one.

1. Introduction

1Plants have established multi-level passive and active resistance mechanisms during the course of evolution that can be used coordinately against pathogen infection. Passive resistance mainly involves physical barriers on the plant cell surface and substances inside cells that are toxic to pathogens, such as antibacterial compounds, phenols, unsaturated lactones, and antimicrobial peptides. Active defense is mainly induced rapidly after pathogen infection, and it includes the release of reactive oxygen species (ROS), the production of the hypersensitive response (HR), the formation of phytoalexin, and the reinforcement and repair of the cell wall. The activation time and intensity of the defense response determine the plant’s resistance level.

2After plants are infected by pathogens, such as bacteria, fungi, oomycetes, mycoplasma, or viruses, the activation of the defense response is finely regulated. At the infection site, the plant defense response is initiated by two types of molecules that are derived from pathogens. A pathogen-associated molecular pattern (PAMP), recognized by cell-surface-localized pattern-recognition receptor (PRR)-triggered immunity (PTI), initiates the first defense line of host-induced defense responses, giving plants a basic resistance to most pathogens. In the resistant host–pathogenic microbe pathosystem, after recognizing the PAMPs produced by pathogens, resistant hosts directly induce PTI, such as calcium ion (Ca2+) influx, ROS production, and mitogen-activated protein kinase (MAPK) activation. Then, the downstream salicylic acid (SA) or jasmonic acid (JA)/ethylene (ET) signal pathway is activated, which leads to the biosynthesis of defense-related factors and the activation of disease resistance in plants (Figure 1). The other type of initiator is effector proteins, such as AvrPto, AvrPtoB, and AvrPphB, which are transported to plant cells mostly by the pathogen type III secretion system. Effector-triggered immunity (ETI) induced by the interactions of plant resistance (R) proteins and pathogen effectors can start the second line of host-induced defense responses (Figure 1). It stimulates a series of defense responses, such as HR/programmed cell death (PCD) and systemic acquired resistance (SAR). These reactions can be induced by SA, resulting in a strong resistance to some biotrophic or hemi-biotrophic pathogens. The JA/ET-mediated pathway is involved in inducing resistance to necrotrophic pathogens. To survive pathogen invasion, plants use a variety of signaling pathways to activate their resistance responses. Therefore, plant-induced resistance is regulated by a complex signal transduction network and involves the expression of a series of resistance-related genes (Figure 2).

3At present, it is clear that some signal molecules, such as Ca2+, ROS, nitric oxide (NO), the heterotrimeric G protein, and non-coding RNAs (ncRNAs), play important roles in regulating disease resistance and the defense signal transduction network. Both PTI and ETI are regulated by plant hormones, with SA, JA, and ET being the main signals. In addition, the disease resistance response by plants also involves the immune response mediated by MAPK and the subsequent antibacterial products, ROS, defensins, and phytoalexins, which can also enhance the defensive capability against pathogens. In recent years, important progress has been made in the research on plant disease resistance signaling pathways. This paper summarizes the progress and forecasts future research to provide a theoretical basis for the prevention and control of plant diseases.

2.1. Calcium-Mediated Disease Resistance Pathway

4Ca2+ is a conserved second messenger and the main mediator of plant immune and stress responses. A recent study showed that NRG1.1, a plant nucleotide-binding leucine-rich repeat receptor function in ETI, actually encodes a Ca2+-permeable channel. As a ubiquitous signal molecule, Ca2+ controls a wide range of cellular metabolic processes, including the regulation of oxidative burst, gene expression, and signal transduction, and it also regulates many key points in the apoptotic process. It is crucial to the regulation of various stress genes involved in plant resistance. The distribution of Ca2+ in plant cells is extremely unbalanced. A change in the intracellular free Ca2+ concentration may be mainly realized by the transmembrane transport of Ca2+ or the regulation of Ca chelates. The Ca2+ concentration is crucial for immunity triggered by Ca2+-dependent PAMPs in plants. At a sufficient external Ca2+ concentration, the encoded cyclic nucleotide-gated channel is the key determinant of Ca2+ signaling and PTI responses induced by PAMPs and ROS. After pathogen invasion, the channel is phosphorylated and activated by the effector kinase Botrytis-induced kinase 1 of the pattern-recognition receptor complex, triggering an increase in the intracellular Ca2+ concentration. Plant perception of pathogen-related stress usually leads to stomatal closure. The Arabidopsis thaliana Ca2+ osmotic channel OSCA1.3 and its phosphorylation by Botrytis-induced kinase 1 can control stomatal closure during immune signal transduction. Ca2+ signals are also involved in the regulation of biotic/abiotic stress-induced PCD in plants, and Ca2+ participation in early apoptosis is particularly important.

5Intracellular Ca2+ signals are transduced through downstream receptor proteins. At present, there are mainly two kinds of calcium receptor proteins in plants: calmodulins (CaMs) and Ca2+-dependent protein kinase (CDPK). In Arabidopsis, CaMs and calmodulin-like proteins (CMLs) constitute a large Ca2+-sensing receptor protein family that translates and transmits Ca2+ signals in many signal transduction cascade reactions. In addition, a CaM antagonist can inhibit the PAMP-induced Ca2+ channel and nitric oxide synthase (NOS)-mediated induction of NO, suggesting that Ca2+, CaMs, and NOS are involved in the signal transduction cascade of plant pathogens. Moreover, the CaM transcription activator factor is involved in SA biosynthesis and SA-mediated immune responses. Recent studies have shown that CML proteins, such as CML13 and CML8, are involved in plant defense responses to many pathogens, such as Pseudomonas syringae and Ralstonia solanacearum, and their overexpression regulates pathogenesis-related (PR) genes as well as many genes involved in signal transduction and stress responses. In recent years, the evidence for CDPKs being involved in plant defense responses has gradually increased. The A. thaliana CPK5 enhances SA-mediated resistance to the bacterial pathogen P. syringae pv. tomato strain DC3000, resulting in the differential expression of plant defense genes and the synthesis of ROS. Rice OsCPK10 interferes with the growth of necrotic fungi by reducing the accumulation of hydrogen peroxide (H2O2), which improves basic disease resistance. However, the overexpression of some CDPKs, such as AcoCPK1 and GhCDPK28–6, weakens plant resistance to necrotic pathogens and reduces hormone response gene expression. In short, Ca2+, as a very important intracellular signal transduction factor, is crucial to the regulation of plant defense response gene expression and plays a key role in plant innate immunity. However, the specific mechanisms of Ca2+ regulation at the molecular level are still unclear.

2.2. ROS-Mediated Disease Resistance Signaling Pathway

6During biotic or abiotic stress, ROS in plants will be produced rapidly and briefly, resulting in the cellular ROS concentration being significantly higher than normal. This represents the frequently mentioned ‘oxidative burst’. In addition, glucan, galactosaldehyde, peptides, and SA from pathogenic fungi and their plant hosts can also induce the plants to produce ROS and increase cell mortality. There are five types of ROS, with H2O2 being a relatively stable type that can diffuse into subcellular intervals, making it a more physiologically important ROS type. The plant NADPH oxidase RBOHD is the main participant in ROS production during innate immunity, and the ROS oxidative burst is likely caused by NADPH oxidase activity. The C-terminal of RBOHD is regulated by the phosphorylation and ubiquitination of various kinases to ensure the production of a full elicitor-induced ROS burst. The mutation of a phosphorylation site weakens the defense responses of plants against pathogen infection. However, how the ROS level is precisely regulated to avoid cell damage owing to excessive ROS production, and how pathogens tolerate ROS stress, remains unclear.

7ROS have dual functions under stress conditions. On the one hand, due to their strong oxidative properties, ROS disrupt the normal metabolism of organisms and also cause the degradation of macromolecular substances, resulting in cell damage, the loss of normal physiological functions, and even death. On the other hand, ROS, as important signal molecules, are active in many biological systems. For example, ROS may be used as antibacterial agents and have direct toxicity against invasive pathogens. ROS are also involved in the lignification of the cell wall and the cross-linking of related proteins with the cell wall, strengthening the cell wall and enhancing the structural disease resistance of the host.

8An ROS burst is also considered to be a characteristic response of an HR and one of the earliest responses to pathogens. From the beginning of pathogen infection to the production of plant SAR, a continuous signal transmission process occurs. As a signal in this process, ROS also function as excitation signals to induce the formation of SAR. At this point, ROS play dual roles in plant defense responses; that is, at high concentrations, ROS damage plants, but at low concentrations, ROS signal transduction induces the expression of plant resistance and defense genes. Although ROS waves have been shown to be essential for rapid systemic signaling, they do not convey the specificity of all systemic responses. Recent studies have shown that ROS waves and calcium waves interact with each other and have potential co-amplification effects. Moreover, ROS, calcium, and electric signals have also been proposed to have a potential link in systemic signal transduction from local tissues to the whole plant. How these rapid systemic signals interact with and integrate each other under different stresses remains largely unknown.

2.3. NO-Mediated Disease Resistance Signaling Pathway

9NO is a redox signaling molecule that is widely distributed in organisms and that participates in a variety of physiological processes through the regulation of different post-translational modifications (PTMs). The bioactivity of NO can be initiated by S-nitrosation, a process involving the addition of the NO moiety to protein cysteine thiols to form S-nitrosothiols, which are considered to be important PTMs that control numerous cellular processes associated with plant immunity. In plants, NO can regulate SUMOylation through the S-nitrosation of the SUMO (small ubiquitin-like modifier)-conjugating enzyme, which has been proposed to control the activation of plant immunity. The range of research on NO free radicals as messengers involved in plant immune responses has increased gradually. Under the stimulation of pathogens, the NO synthesis efficiency increases, which can induce the accumulation of phytoalexins, affect the accumulation of peroxidase ROS, induce the generation of H2O2, regulate the redox state of the host, and activate the expression of MAPK defense genes and disease-related proteins. Many studies have shown that NO regulates the HR–PCD and activates the expression of plant disease resistance- and defense-related genes through synergistic effects with ROS. During the compatible interaction between tobacco and the necrotrophic fungus Botrytis cinerea, both NO and ROS increase, and SA-induced protein kinases and some defense related genes are activated. A loss of function and virus-induced gene silencing analyses have shown that NO plays key roles in the resistance to B. cinerea and in inducing PR-1 expression. In contrast, ROS are positively correlated with lesion expansion. In the HR reaction, NO can also interact with SA to regulate the production of ET, and finally affect the formation of an HR. After plants perceive a pathogen infection, an oxidative burst promotes the accumulation of NO and ROS and activates the downstream signal cascade. However, the production and transmission of NO in plants, and the regulation of downstream genes, are still vague. In the future, the untapped role of NO in gene transcription should be further explored using omics technology.

3.1. SA-Mediated Disease Resistance Signaling Pathway

10In recent years, research on the function of SA has become an important and rapidly developing field in biology. SA plays a wide range of physiological roles in plant growth, development, maturation, aging regulation, and stress-resistance induction. However, the current research on the physiological roles of SA in plants is still focused on disease resistance and signal transduction. After infection, SA is closely related to the formation of the local resistance of infected tissues and the SAR of uninfected tissues (Figure 3). Infected tissues show the HR response, produce signaling substances such as SA, and activate SAR gene expression. SA, as a system signal, can also cause an increase in the SA level in uninfected tissues and then induce the expression of PR genes, resulting in disease resistance throughout the whole plant.

11Plant SAR is realized through the mutual recognition and interaction between plant resistance genes (R) and the avirulence genes of pathogenic microorganisms. SA is a signal molecule of plant systemic resistance responses that is specific to many R genes, and which can regulate many immune-related genes (Shine et al. 2016). The SA accumulation caused by pathogen infection can be controlled by some protein regulators, such as enhanced disease susceptibility 1 (EDS1), phytoalexin-deficient 4 (PAD4), EDS4, EDS5, and non-race-specific disease resistance 1 (NDR1). EDS1 and its interaction factors, including PAD4 and the sensitivity-associated senescence-associated gene 101 (SAG101), are involved in regulating the accumulation of HR–PCD and SA. In turn, SA can enhance the expression of EDS1/PAD4/SAG101 through a positive feedback loop. Moreover, EDS1 and SA have redundant functions in some coiled-coil nucleotide-binding site–leucine-rich repeat (CC-NB-LRR) protein-mediated signal transduction. NDR1 is an R protein containing a CC domain located in the plasma membrane. The Arabidopsis NDR1 gene is a positive regulator of SA accumulation and is necessary for R gene-mediated signaling. As with EDS1, NDR1 acts upstream of SA to regulate SA accumulation, and the induction of the SA/NDR1-mediated pathway may increase plant resistance to pathogens.

12SA is perceived by two classes of receptors: transcriptional activator non-expressor of PR genes 1 (NPR1) and the transcriptional repressors NPR3/NPR4. NPR1’s encoding of a redox-sensitive protein results in an important regulatory element in the SA signaling pathway. NPR1 is a key component of SA-induced SAR. When there is no pathogen infection, NPR1 is continuously cleared by proteasomes to limit the activity of its coactivator, thereby preventing untimely SAR activation. However, not all SAR-mediated responses depend on NPR1. The Arabidopsis whirly transcription factor (AtWHY1) and SSI1 are two regulators of SAR that depend on SA and not on NPR1. The activation of NPR1 also regulates SA tolerance, the expression of isochorismate synthase 1 (ICS1), and SA accumulation in Arabidopsis. As a transcription inhibitor, NPR3/NPR4 inhibits the response of the SA pathway in the absence of pathogen infection, which is the opposite function of NPR1 in plant immune regulation. After binding with SA, its transcriptional repressor activity is inhibited, activating downstream target genes and defense responses. Recent studies have shown that SAR requires the opposite effects of NPR1 and NPR3/NPR4, which may also contribute to the production of PTI and ETI.

3.2. JA-Mediated Disease Resistance Signaling Pathway

13JA is also a stress signal molecule that accumulates rapidly and massively when plant tissues are invaded by microbial pathogens or insects. JAs may induce the expression of defense-related proteins, such as polyphenol oxidase, protease inhibitors, peroxidase, and lipoxygenase. JAs may also induce the production of alkaloids and some volatiles, and the formation of defense structures, which exert the stress and disease resistance functions of plants.

14Although there is a good understanding of the JA synthesis pathway, the perception and subsequent signal transduction of JA are not very clear. The jasmonate ZIM domain (JAZ) is known to be an inhibitor of the JA signaling pathway that inhibits the expression of JA response genes through interactions with MYC2. JA signals can promote the interaction between JAZ and SCFCOI1 ubiquitin ligase, resulting in the ubiquitination of the JAZ protein and degradation by the 26S proteasome. After JAZ protein degradation, transcription factors such as MYC2 are promoted to activate JA response genes. Recent studies have shown that JAZ4, a family member of JAZ, enhances resistance to the bacterial pathogen P. syringae pv. tomato strain DC3000 by inhibiting the JA pathway. Phytochrome and flowering time 1, which encodes the subunit of the mediator complex, is a key regulator of JA-dependent defense responses in Arabidopsis, and it presumably acts downstream of the COI1–JAZ–MYC2 complex. In combination with another mediator complex subunit, MED8, it is involved in regulating plant growth and development (such as flowering time) and JA-dependent defense responses. There may be crosstalk between the JA signaling pathway and antiviral RNA-silencing pathways. The JA-responsive transcription factor JAMYB transcriptionally activates Argonaute18, the core component of RNA silencing, to increase the resistance of rice to viral diseases. In addition, JA suppresses the brassinosteroid (BR) pathway in a COI1-dependent manner in response to rice black-streaked dwarf virus infection. However, BR and JA positively regulate rice stripe virus resistance in the rice–virus interaction.

3.3. ET-Mediated Disease Resistance Signaling Pathway

15ET plays an important regulatory role in many physiological processes of plants, from seed germination to senescence. ET biosynthesis is regulated by many factors, including developmental and environmental factors. There are five ET membrane-binding receptors in Arabidopsis, ETR1, ETR2, ERS1, ERS2, and EIN4, which can transmit signals to downstream effectors. Arabidopsis infected by Fusarium oxysporum can stimulate ETR1-mediated ET signaling and enhance susceptibility. Additionally, ETR1 receptor mutant plants can significantly increase the resistance compared with wild-type plants, but other ET mutants, including ein2, ein5, and ein4, are as susceptible as wild-type plants. CTR1 is a serine/threonine protein kinase belonging to the Raf family that is located downstream of the ET receptor. In the absence of an ET signal, the ET receptor activates CTR1, which negatively regulates the downstream ET response pathway. After binding to ET, the receptor is inactivated, resulting in the inactivation of CTR1, and EIN2 becomes a positive regulator of the ET pathway. EIN2 transmits a signal to the EIN3 transcription factor located in the nucleus, causing EIN3 to bind to the ET response element in the promoter of ET response factor 1 (ERF1). ERF1 can interact with the GCC box of the target gene promoter to activate the downstream ET response. The ineffective mutation of EIN2 leads to insensitivity to ET during the whole plant developmental process, indicating that EIN2 is a key positive regulator in the ET signal transduction pathway. EIN3 is a member of a multigene family of nuclear localization proteins in Arabidopsis. Among the six members of this family, EIN3, EIN3-like 1 (EIL1), and EIL2 can restore the phenotypes of EIN3 mutants, indicating that EIL1 and EIL2 are also involved in ET signal transduction.

16JA and ET jointly mediate rhizosphere microorganism-triggered induced systemic resistance (ISR), which can improve the resistance of plants to a broad spectrum of pathogens, such as Alternaria brassicicola, Botrytis cinerea, and Pseudomonas syringae pv. tomato DC3000. ERF1 and MYC2 integrate signals from the JA/ET signal transduction pathway and activate defense-related genes, such as PR-3, PR-4, and PR-12, which encode antimicrobial peptides involved in the JA/ET response. Further studies showed that the expression of PDF1.2 depends on the simultaneous activation of JA and ET signals, whereas the expression of Thi2.1 only depends on methyl jasmonate (Me-JA). In addition, ET can also produce inducible systemic resistance in the jar1 mutant, indicating that the elements of the ET response act downstream of JA in the signal transduction process of inducible systemic resistance.

4. Heterotrimeric G Protein-Mediated Disease Resistance Signaling Pathway

17The growth, development, and differentiation of plant cells are controlled by the stimulation of plant internal factors and the external environment. A considerable number of regulatory factors do not enter the cell, but are transformed into intracellular signals through transmembrane signaling pathways, in which the signal transduction components on the plasma membrane play crucial roles. Among them, heterotrimeric G proteins are currently considered to be ubiquitous signal transduction elements in eukaryotes, including plants, fungi, and animals. The heterotrimeric G protein signaling pathway not only converts extracellular signals into intracellular signals, but it also functions to amplify signals and activate multiple downstream effector enzymes, such as adenylate cyclase in animals and phospholipase C (PLC) in plants. Effector enzymes can produce a large number of second messengers, such as cAMP, which can also further amplify signals through signal transduction pathways.

18In Arabidopsis and rice, the typical heterotrimeric G protein consists of one α subunit, one β subunit, and two γ subunits. Heterotrimeric G protein signaling in plants is related to a variety of plant responses to biotic/abiotic stresses and the regulation of plant physiological growth and development. In particular, heterotrimeric G proteins are involved in the resistance and immunity of plants to a variety of pathogens. Arabidopsis G proteins could directly interact with the FLS2–BIK1 receptor complex to modulate flg22-triggered immunity through both pre-activation and post-activation mechanisms. In Arabidopsis, resistance to the necrotrophic pathogenic fungi A. brassicola and F. oxysporum depends on the Gβγ-mediated signaling pathway, and interfering with the Gβγ signaling pathways later affected many JA-mediated responses. Therefore, it has been speculated that G proteins may participate in plant resistance to necrotrophic pathogenic fungi by enhancing the JA signaling pathway. The heterotrimeric G protein β subunit is necessary for plant resistance against different P. syringae strains. It activates MAPK signaling and produces ROS through NADPH oxidase downstream of the G protein signal. The MAPK cascade can be used as a downstream effector of G protein signal transduction. RACK1 is a plant MAPK protein connecting heterotrimeric G proteins and the MAPK cascade to form a unique signal pathway in plant immunity. However, the mechanisms behind the ability of G protein complexes to trigger the activation of the MAPK cascade are still unknown. Moreover, how the upstream and downstream components of heterotrimeric G protein signaling participate and how the G protein regulates their active metabolism need to be explored.

5. MAPK Cascade-Mediated Disease Resistance Signaling Pathway

19Protein kinases are the target enzymes of many intracellular second messengers, which further transduce signals by regulating the phosphorylation of intracellular proteins. In plants, there are more than 30 kinds of known protein kinases, and they affect many processes, including light resistance, cold resistance, photosynthesis, self-incompatibility, and cell division. Among the protein kinases, MAPK is a type of Ser/Thr protein kinase, and it has three main types: MAPKs, MAPKKs, and MAPKKKs. They form a series of reactions that transfer and magnify external signals. MAPKKKs are located upstream of the chain reaction and link external signals with downstream regulators by phosphorylation. An activated MAPKKK activates MAPKK, and then the MAPK is activated through dual phosphorescence by MAPKK at Thr/Tyr phosphorylation sites. MAPK stays in the cell to activate a series of other protein kinases or enters the nucleus to regulate the expression of certain genes through transcription factor phosphorylation. MAPK signaling actively participates in PTI and ETI responses and mediates a variety of defense mechanisms in response to pathogen infection. Arabidopsis MKK7 belongs to group D of plant MAPKKs. Group D members from other species also play key roles in plant defense responses. For example, the overexpression of MKK4 from tomato leaves leads to cell death and activates MPK2 and MPK3, both of which are related to plant defense responses. The overexpression of MKK7 in Arabidopsis can positively regulate basic resistance and SAR by regulating SA synthesis. This is characterized by constitutive PR gene expression and enhanced resistance to pathogens. The transcriptional activation of MPKs depends on their phosphorylation. Under pathogen attack, cotton GhNTF6 is the only member of the MPK family that requires a phosphorylation reaction, and the overexpression of this gene in Arabidopsis enhances resistance against Verticillium dahlia. WRKY is a downstream transcription factor in the MAPK pathway, and its resistance role has been reported in many plants. An RNA-Seq analysis of rice WRKY67 shows that it can induce the transcription of defense-related genes, and the overexpression of WRKY67 in rice can increase resistance to bacterial blight.

20The reverse phosphorylation of protein phosphatase is a termination signal or a reverse regulation. Although research on protein phosphatase is not as in-depth as that on phosphokinases, it is of equal significance. The results of protein phosphorylation and dephosphorylation are different, and this may be related to the transduction of different stimulating signals in cells. In fact, it is the reversibility of protein phosphorylation that provides a switching effect for cell information that enables cells to effectively and economically regulate their responses to internal and external information.

6. ncRNA-Mediated Disease Resistance Pathway

21Non-coding RNAs (ncRNAs) refer to RNAs that do not encode proteins, which play an essential role in plant growth and development and resistance to abiotic/biotic stresses. ncRNAs involved in the regulation of plant innate immunity mainly include microRNAs (miRNAs), long non-coding RNAs (lncRNAs), and circular RNAs (circRNAs), which play an important role in plant immune responses. As short-chain (21–25 nt) ncRNAs, miRNAs usually regulate gene expression by cleaving or inhibiting the translation of target gene transcripts, and play critical roles in regulating plant development and immune responses. In Arabidopsis, tobacco, barley, and other species, miRNAs can regulate R gene expression by guiding the cleavage of R genes or triggering phasiRNA production, indicating that miRNAs play a role in regulating plant PTI or ETI. Moreover, some miRNAs and small interfering RNAs (siRNAs) can directly target key signaling components such as immune receptors, receptor-like kinases, or downstream transcription factors to modulate immunity. Disease resistance and high yields in plants are often antagonistic. miR393 can enhance plant immunity by fine-tuning the balance of SA–auxin hormone and promoting the exocytosis of antibacterial proteins in plants. In rice, miR396 and its target growth-regulating factor (OsGRF) genes modulate the trade-offs between rice blast disease resistance and yield. However, the specific mechanisms by which most miRNAs regulate disease resistance are still poorly understood.

22ncRNAs with a length greater than 200 nt are called lncRNAs, and some lncRNAs serve as precursors of miRNAs and siRNAs to assist in the cleavage of target genes. lncRNAs can regulate ROS accumulation and induce the expression of PR genes to modulate plant immunity. In tomato, lncRNA16397 induces the expression of glutaredoxin (GRX) to reduce the accumulation of ROS in cells, thereby reducing the damage to the cell membrane and enhancing the resistance to Phytophthora infestans. In addition, some lncRNAs serve as targets of miRNAs or endogenous target mimics for miRNAs to regulate host immunity. Circular RNA (circRNA) is another type of lncRNA, which is a closed-loop single-stranded RNA formed by the reverse splicing of introns or gene exons and delivered to the cytoplasm. Plant circRNAs can directly or indirectly bind to miRNA to competitively inhibit the regulation of miRNA on target genes, and are widely involved in the regulation of plant immune responses.

23Many studies have revealed that mobile ncRNAs, mainly miRNAs, can translocate between plants and pathogens to mediate cross-kingdom RNAi. Notably, virus-derived small interference RNAs (vsiRNAs) were shown to be a potential trigger for virus resistance via RNA silencing-related antiviral mechanisms or via regulating host defensive gene expression in transgenic plants. Thus, ncRNA-mediated regulation plays an important role in plant disease resistance, but the regulatory mechanisms and roles of ncRNAs in immunity response need to be further studied.

7. Interaction and Complexity of Disease Resistance Signaling Pathways

24In nature, plants often need to fight simultaneously against a variety of pathogens, and this alters the defense responses originally induced by plants. Therefore, plants need effective regulatory mechanisms to adapt to the changes in a hostile environment. The crosstalk between signaling pathways provides the plant with a powerful capacity to finely regulate defense responses. Plants can activate an effective defense response by regulating the level of signal molecules, changing the expression of defense-related genes, and coordinating the complex relationships among defense signaling pathways.

25There are at least two signaling pathways against different pathogens in Arabidopsis, the SA-dependent and JA/ET-mediated pathways. Many studies have shown that there is crosstalk between SA- and JA/ET-induced signaling pathways, and most evidence shows that the SA and JA/ET pathways have an antagonistic relationship (Figure 2). Perhaps because of this, the activation of SA responses may make plants more vulnerable to attackers connected to the JA/ET defense response. Robert showed that the antagonistic effect of SA on the JA signal transduction pathway is likely to be achieved by inhibiting the JA-mediated degradation of the JAZ protein. However, some studies have shown that there is a synergistic relationship between the SA and JA signaling pathways. JA and ET co-regulate and activate the expression of some defense-related genes, such as PR-3, PR-4, and PR-12. ERF1 is a positive regulator of JA and ET signal transduction. Recent studies have found that the overexpression of rice JAZ1 significantly inhibited the transcriptional expression of ERF1, confirming the synergy between the JA and ET pathways. However, JA and ET do not always cooperate with each other. For example, the wound response gene activated by JA is inhibited by ET, and the activation of JA by the transcription factor MYC inhibits their respective transcriptional activities by binding with an ET transcription factor, resulting in the weakening of plant defenses against insect attacks.

26The interaction between plants and pathogens is generally accompanied by intracellular Ca2+ transients, which activate the Ca2+ signaling pathway, induce the production of ROS and NO, and positively regulate early local and systemic acquired resistance (Figure 2). SA and ROS also have a common disease resistance signal-sensing mechanism. Recent studies have shown that small defense-associated protein 1 can regulate plant immunity through the SA-mediated defense pathway and induce a tolerance to oxidative stress. However, the relationship between SA-mediated defense responses and the Ca2+ signaling pathway is unclear. SA and ROS also have a common molecular signal-sensing mechanism of disease resistance. In wheat spotted-leaf mutants, the SA accumulation and enhanced Ca2+ signaling jointly triggered PCD, which eventually led to spontaneous leaf necrosis. However, it is not clear whether or how SA is regulated by the Ca2+ signal transduction pathway during plant–pathogen interactions.

27Regulatory proteins are the basis of crosstalk between different defense signal pathways, and they are also the key factors regulating the overall disease resistance of plants. At present, some key regulatory proteins involved in the crosstalk between the SA and JA/ET pathways and the coordination of their complex relationships, such as NPR1, EDS1 and MPK4, have been identified in Arabidopsis by gene mutation and gene transgenic techniques (Table 1), and this enables us to better understand the interaction mechanisms among different signaling pathways. However, although progress has been made in the study of plant disease resistance signaling pathways, the locations and mechanisms of synergistic or antagonistic interactions among pathways still lack direct experimental evidence. In addition, how plants coordinate these complex relationships and the corresponding molecular mechanisms need to be further studied.

8. Conclusions and Prospects

28Plant diseases have always been a considerable problem that limit the achievement of high and stable yields, high-quality produce, and the safe production of crops. In-depth studies and the utilization of plant disease resistance mechanisms and disease resistance-related signaling pathways will provide new ideas for the prevention and control of plant diseases. The mechanisms of plant disease resistance responses are very complex and diverse. There are huge numbers of regulatory factors and genes involved in plant–pathogen interactions, disease resistance signal transduction, and defense responses, and they form a complex regulatory network (Figure 2). Signaling molecules, such as Ca2+, H2O2, NO, SA, JA, ET, and the heterotrimeric G protein, play important roles in this network. At present, studies have shown that other signaling molecules, such as abscisic acid, gibberellic acid, cytokinin, BR, and peptide hormones, are also involved in plant defense-related signal transduction pathways, but their roles in plant defense are still unclear.

29Plant hormone regulation involves complex signal transduction networks, such as those involved in growth, development, and environmental stress responses. At present, with the development of modern molecular biology and transgenic technology, substantial progress has been made in the identification of the key components in plant signal transduction and in the understanding of plant hormone signal transduction (especially for SA, JA, and ET). Now, an important issue is how different hormone-mediated developmental processes and defense responses are regulated in specific tissues and cells. In addition, not only can plants produce hormones, but some plant pathogens can also produce plant hormones, which can cause hormone imbalances and break the plant defense response system. It is not clear how pathogens regulate hormone signal transduction elements to make plants susceptible. An in-depth understanding of hormone-mediated defense responses is very important for controlling crop diseases and insect pests.

30Plant disease resistance signaling pathways are not isolated, but they are inter-connected through complex regulatory networks. Understanding how plants coordinate various signal components is an important aspect of future research. In recent years, many researchers at home and abroad have tried to identify the regulatory proteins acting between signaling pathways, but the results have not been consistent, and their specific functions and roles in hormone signaling pathways need to be studied further. Finding new contact points will be one of the hotspots in the research on plant disease resistance signaling pathways in the future. With the development of molecular biology and the in-depth study of disease resistance-related transcription profiles from some model plants, such as Arabidopsis and rice, many plant regulatory protein-encoding genes related to pathogen infection have been extensively studied and analyzed. Using plant genetic engineering technology, various transgenic disease-resistant plants have been constructed and applied in agricultural production. This may increase our understanding of plant resistance mechanisms and also enrich the candidate genes for crop disease resistance breeding and improvement, which has particularly important research significance and broad application prospects.

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Ding L.N., Li T., Guo X.J., Li M., Liu X.Y., Cao J., Tan X.L. Sclerotinia Stem Rot Resistance in Rapeseed: Recent Progress and Future Prospects. J. Agric. Food Chem. 2021;69:2965-2978.
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Spoel S.H., Dong X. How do plants achieve immunity? Defence without specialized immune cells. Nat. Rev. Immunol. 2012;12:89-100.
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Nicaise V., Candresse T. Plum pox virus capsid protein suppresses plant pathogen-associated molecular pattern (PAMP)-triggered immunity. Mol. Plant Pathol. 2017;18:878-886.
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Schreiber K.J., Chau-Ly I.J., Lewis J.D. What the Wild Things Do: Mechanisms of Plant Host Manipulation by Bacterial Type III-Secreted Effector Proteins. Microorganisms. 2021;9:1029.
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Signaling Crosstalk between Salicylic Acid and Ethylene/Jasmonate in Plant Defense: Do We Understand What They Are Whispering? · 2019
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Overmyer K., Vuorinen K., Brosché M. Interaction points in plant stress signaling pathways. Physiol. Plant. 2018;162:191-204.
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Disease Resistance Mechanisms in Plants · 2018
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A molecular roadmap to the plant immune system · 2020
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16.
Jacob P., Kim N.H., Wu F., El-Kasmi F., Chi Y., Walton W.G., Furzer O.J., Lietzan A.D., Sunil S., Kempthorn K., et al. Plant “helper” immune receptors are Ca2+-permeable nonselective cation channels. Science. 2021;373:420-425.
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Calcium Signalling in Plant Biotic Interactions · 2018
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Hilleary R., Paez-Valencia J., Vens C., Toyota M., Palmgren M., Gilroy S. Tonoplast-localized Ca2+ pumps regulate Ca2+ signals during pattern-triggered immunity in Arabidopsis thaliana. Proc. Natl. Acad. Sci. USA. 2020;117:18849-18857.
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Tian W., Hou C., Ren Z., Wang C., Zhao F., Dahlbeck D., Hu S., Zhang L., Niu Q., Li L., et al. A calmodulin-gated calcium channel links pathogen patterns to plant immunity. Nature. 2019;572:131-135.
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Calcium Sensors as Key Hubs in Plant Responses to Biotic and Abiotic Stresses · 2016
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Kim Y.S., An C., Park S., Gilmour S.J., Wang L., Renna L., Brandizzi F., Grumet R., Thomashow M.F. CAMTA-Mediated Regulation of Salicylic Acid Immunity Pathway Genes in Arabidopsis Exposed to Low Temperature and Pathogen Infection. Plant Cell. 2017;29:2465-2477.
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27.
Zhu X., Robe E., Jomat L., Aldon D., Mazars C., Galaud J.P. CML8, an Arabidopsis Calmodulin-Like Protein, Plays a Role in Pseudomonas syringae Plant Immunity. Plant Cell Physiol. 2017;58:307-319.
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Shen L., Yang S., Guan D., He S. CaCML13 Acts Positively in Pepper Immunity Against Ralstonia solanacearum Infection Forming Feedback Loop with CabZIP63. Int. J. Mol. Sci. 2020;21:4186.
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29.
Zhu X., Mazard J., Robe E., Pignoly S., Aguilar M., San Clemente H., Lauber E., Berthomé R., Galaud J.P. The Same against Many: AtCML8, a Ca2+ Sensor Acting as a Positive Regulator of Defense Responses against Several Plant Pathogens. Int. J. Mol. Sci. 2021;22:10469.
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32.
Bundó M., Coca M. Calcium-dependent protein kinase OsCPK10 mediates both drought tolerance and blast disease resistance in rice plants. J. Exp. Bot. 2017;68:2963-2975.
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Zhang M., Liu Y., He Q., Chai M., Huang Y., Chen F., Wang X., Liu Y., Cai H., Qin Y. Genome-wide investigation of calcium-dependent protein kinase gene family in pineapple: Evolution and expression profiles during development and stress. BMC Genom. 2020;21:72.
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Calcium-Dependent Protein Kinase GhCDPK28 Was Dentified and Involved in Verticillium Wilt Resistance in Cotton · 2021
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35.
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Regulation of ROS Metabolism in Plants under Environmental Stress: A Review of Recent Experimental Evidence · 2020
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Mechanisms of ROS Regulation of Plant Development and Stress Responses · 2019
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Regulation of reactive oxygen species during plant immunity through phosphorylation and ubiquitination of RBOHD · 2020
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Antimicrobial Actions of Reactive Oxygen Species · 2011
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Slesak I., Libik M., Karpinska B., Karpinski S., Miszalski Z. The role of hydrogen peroxide in regulation of plant metabolism and cellular signalling in response to environmental stresses. Acta Biochim. Pol. 2007;54:39-50.
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Convergent Evolution of Pathogen Effectors toward Reactive Oxygen Species Signaling Networks in Plants · 2017
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Yang C., Fernando W.G.D. Analysis of the Oxidative Burst and Its Relevant Signaling Pathways in Leptosphaeria maculans-Brassica napus Pathosystem. Int. J. Mol. Sci. 2021;22:4812.
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Gilroy S., Białasek M., Suzuki N., Górecka M., Devireddy A.R., Karpiński S., Mittler R. ROS, Calcium, and Electric Signals: Key Mediators of Rapid Systemic Signaling in Plants. Plant Physiol. 2016;171:1606-1615.
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Yang L., Li B., Zheng X.Y., Li J., Yang M., Dong X., He G., An C., Deng X.W. Salicylic acid biosynthesis is enhanced and contributes to increased biotrophic pathogen resistance in Arabidopsis hybrids. Nat. Commun. 2015;6:7309.
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Shapiro A.D., Zhang C. The role of NDR1 in avirulence gene-directed signaling and control of programmed cell death in Arabidopsis. Plant Physiol. 2001;127:1089-1101.
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SAG101 Forms a Ternary Complex with EDS1 and PAD4 and Is Required for Resistance Signaling against Turnip Crinkle Virus · 2011
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85.
Enhanced Disease Susceptibility 1 and Salicylic Acid Act Redundantly to Regulate Resistance Gene-Mediated Signaling · 2009
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86.
Lu H., Zhang C., Albrecht U., Shimizu R., Wang G., Bowman K.D. Overexpression of a citrus NDR1 ortholog increases disease resistance in Arabidopsis. Front. Plant Sci. 2013;4:157.
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Li X., Clarke J.D., Zhang Y., Dong X. Activation of an EDS1-mediated R-gene pathway in the snc1 mutant leads to constitutive, NPR1-independent pathogen resistance. Mol. Plant Microbe Interact. 2001;14:1131-1139.
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93.
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96.
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99.
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102.
He Y., Zhang H., Sun Z., Li J., Hong G., Zhu Q., Zhou X., MacFarlane S., Yan F., Chen J. Jasmonic acid-mediated defense suppresses brassinosteroid-mediated susceptibility to Rice black streaked dwarf virus infection in rice. New Phytol. 2017;214:388-399.
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Hu J., Huang J., Xu H., Wang Y., Li C., Wen P., You X., Zhang X., Pan G., Li Q., et al. Rice stripe virus suppresses jasmonic acid-mediated resistance by hijacking brassinosteroid signaling pathway in rice. PLoS Pathog. 2020;16:e1008801.
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104.
Binder B.M. Ethylene signaling in plants. J. Biol. Chem. 2020;295:7710-7725.
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