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Plant growth-promoting microorganisms as biocontrol agents of plant diseases: Mechanisms, challenges and future perspectives

Mohamed T. El-Saadony, Ahmed M. Saad, Soliman M. Soliman and 12 more

Frontiers in Plant Science · 2022 · Review · CC BY

doi:10.3389/fpls.2022.923880

Abstract

Plant diseases and pests are risk factors that threaten global food security. Excessive chemical pesticide applications are commonly used to reduce the effects of plant diseases caused by bacterial and fungal pathogens. A major concern, as we strive toward more sustainable agriculture, is to increase crop yields for the increasing population. Microbial biological control agents (MBCAs) have proved their efficacy to be a green strategy to manage plant diseases, stimulate plant growth and performance, and increase yield. Besides their role in growth enhancement, plant growth-promoting rhizobacteria/fungi (PGPR/PGPF) could suppress plant diseases by producing inhibitory chemicals and inducing immune responses in plants against phytopathogens. As biofertilizers and biopesticides, PGPR and PGPF are considered as feasible, attractive economic approach for sustainable agriculture; thus, resulting in a “win-win” situation. Several PGPR and PGPF strains have been identified as effective BCAs under environmentally controlled conditions. In general, any MBCA must overcome certain challenges before it can be registered or widely utilized to control diseases/pests. Successful MBCAs offer a practical solution to improve greenhouse crop performance with reduced fertilizer inputs and chemical pesticide applications. This current review aims to fill the gap in the current knowledge of plant growth-promoting microorganisms (PGPM), provide attention about the scientific basis for policy development, and recommend further research related to the applications of PGPM used for commercial purposes.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 22, 2026. Paragraph numbers are ours, so an answer can point at one.

Introduction

1Plant pathogens and pests can have a large impact on agricultural productivity. Plant diseases reduce yields by 21–30% in several important crops worldwide. Meanwhile, certain plant pathogens have developed long-term resistance against chemical management. Some economically important plant diseases have become more prevalent. Dependence on chemical pesticides has become one of the most pressing challenges to global environmental sustainability and public health. Because many of insecticides are difficult to break down into simpler components that are less dangerous, toxic residues remain in the soil; thus, posing health concerns. Awareness of the environmental and health risks associated with synthetic chemical pesticides is highly recommended for sustainable crop management and less used chemicals.

2Synthetic agrochemicals have been considered unsustainable, causing the quest for more environmentally friendly alternatives. The focus of modern agriculture research has turned to farm practices. Plant growth-promoting rhizobacteria (PGPR) are effective, environmentally safe, and non-toxic naturally occurring microorganisms than can serve as a promising alternative to chemical pesticides. Besides, environmental factors can affect agricultural productivity; thus, this may worsen the scenario in a variety of ways. We have many reasons to take serious actions toward plant disease control management to improve our health and reduce the effects of environmental stresses. Biological control provides one of the most economical and long-term effective strategies for managing plant diseases and reducing crop loss.

3Recent advances in our understanding to plant growth-promoting microorganisms (PGPMs) warrant a proper scientific evaluation of the relationship between the properties of PGPMs and their impact on plant growth, yield, and resistance/tolerance to biotic and abiotic stresses. In addition, this review study builds on a growing body of literature concerning some potential implementations of PGPMs in sustainable agriculture. Here, the aim is to provide a state-of-knowledge review reporting the effects of PGPMs on plants and finding solutions to the challenges that face microbial biological control agents (MBCAs) when applied on a large scale compared with those of chemicals.

PGPR as promising biocontrol agents

4Soil is a complex ecosystem containing various groups of microorganisms, including bacteria, fungi, protists, and animals. These microorganisms play key roles in plant development, nutrient regulation, and biocontrol activities. They settle in the rhizosphere and endo-rhizosphere of plants, where they use a variety of direct and indirect processes to support plant growth. have stated that the phytomicrobiome (plant-associated microorganisms) can provide competitive, exploitative, or neutral alliances with plants; thus, affecting crop yield. Recently, scientists have looked deeply into employing beneficial PGPR to inhibit phytopathogens and promote plant growth. A key part of this might be attributed to the enhancement of target specificity between PGPR and the plant species.

5According to, rhizosphere microbiome refers to bacterial, archaeal and fungal communities as well as their genetic material closely surrounding plant root systems. Microorganisms can indirectly impact crop health and phenotypic plasticity by influencing the growth of plants and defense responses due to their co-evolution with plants on a large scale. The rhizosphere is home to various microorganisms that provide steady PGPR supplies. The phytomicrobiome includes the bacterial population that colonize the rhizosphere, on the root surface, and between the root cortex cells. Since plants can first colonize the terrestrial environments, PGPR have co-evolved with related plants; resulting in synergistic host plants’ relationships. The effects, methods, and possibility for successfully applying PGPR to agricultural plant production in controlled situations have been the subject of numerous studies. This is critical for developing more widely used methods of biological control that consider field settings.

6Safety and quality control are more crucial in vegetable cultivation since we use them less processed or unprocessed, and they have impact on health. PGPR are more achievable under greenhouse conditions. Because of the controlled environment, a significant number of prospective BCA has been discovered, and maybe ready for placement; thus, they have been confirmed to be successful in greenhouse investigations. Bacillus subtilis, Bacillus amyloliquefaciens and Pseudomonas stutzeri are among those shown to achieve success in root colonization as well as prevention of the pathogen Phytophthora capsici in cucumber. At the post-harvest stage, B. subtilis can protect tomato fruits from infection by Penicillium sp. and Rhizopus stolonifer.

7Under greenhouse conditions, B. amyloliquefaciens isolates, diminish Fusarium oxysporum causing Fusarium wilt disease. In controlled situations, PGPR -as BCAs- are effective, indicating their role in greenhouse production systems and their efficacy in commercial horticulture. It is not necessary to distinguish the indirect PGPR pathways for pathogen infection avoidance and plant growth promotion under abiotic stresses. In addition, PGPR with biocontrol activities that also enhance plant growth would be more effective in practice. Plant tolerance to abiotic conditions and resistance to phytopathogens causing plant diseases can be improved by PGPR. Some strains benefit plants’ coping with stress and flourishing in abiotic environments.

8While most researchers have reported PGPR under these controlled conditions, few of them have investigated their effectiveness as BCAs, especially when combined with an abiotic stress. This is a critical factor in field biocontrol, and when climate change affects the ecosystem. The long synergism between PGPR and plant may deliver various benefits to the host plant.

Biocontrol mechanisms using PGPR

9PGPR can enhance the availability of certain nutrients [phosphate solubilization and nitrogen (N2) fixation], or synthesize the phytohormones [indole-3 acetic acid (IAA), ethylene (ET), jasmonic acid (JA), gibberellic acid (GA), and cytokinins (CKs);;;; ].

10PGPR colonizing a host plant can stimulate its growth through direct and indirect mechanisms (Figure 1). Direct mechanisms include the production of plant hormones, solubilization of phosphates, and increased uptake of iron. Indirect effects include antibiotics production, nutritional competition, parasitism, pathogen toxin inhibition, and induced resistance. The attitude of “PGPR” in creating phytohormones, molecules of signaling metabolites, and related substances describe how plants protect themselves from drought as an example of abiotic stress and salinity. According to, PGPR may also alter the shape of the roots, resulting in increased root surface and improved root performance. In addition, PGPR can compete with other bacteria by colonizing rapidly and accumulating a greater supply of nutrients, preventing other organisms from growing. PGPR have different strategies to colonize, of which each is tied to a particular host. In general, pathogen infections can be suppressed by using antibiotics and antifungal metabolites; thus considered a well-known direct biological control strategy. Bacteriocins, antibacterial proteins, and enzymes are examples of antimicrobial peptides. Antibiotics are small antimicrobial molecules produced by PGPR that can inhibit the process of metabolic or growth activities of microbial pathogens. These antibiotics, which are mostly strain-specific, can target the ribosomal RNA (rRNA), alter the membrane structure, and damage the cell walls of bacterial pathogens.

11Many bacteria produce bacteriocins, where some have a greater variety of inhibitory activities than others. Siderophores are specialized chelating agents of ferric iron that inhibit phytopathogens from gaining access to iron; thus, maintaining plant health particularly in iron-deficient environments. PGPR can manage various plant diseases by depriving pathogens of iron, thereby reducing disease development and generating extracellular siderophores. Bacteriocins, siderophores, and antibiotics have thus been identified as the three supreme operative approaches for potential biocontrol prior to in vivo applications. Several studies have investigated PGPR as a potential plant disease management tool to synthesize plant-beneficial metabolites such as siderophores.

12PGPR can indirectly increase crop stress tolerance. Signal chemicals, such as phytohormones and specialized signal molecules, enable plant-to-microbe and microbe-to-plant communication. The control and regulation of activities in the holobiont include the host plant and the “specific” phytomicrobiome (the plant-phytomicrobiome interaction). Two microbe-to-plant signals, lipo-chitooligosaccharides (LCOs) and thuricin17 (TH17), enhance stress tolerance in different plant species. Resistance-inducing and antagonizing PGPR might be useful as new inoculants with combinations of different mechanisms of action, leading to a more efficient use for biocontrol strategies and plant growth promotion.

13PGPR can also produce volatile organic compounds (VOCs) that play a significant role in plant growth and induced systemic resistance (ISR) to pathogens. found that PGPR can trigger ISR as a strategy to improve disease resistance of plants. Roots colonization by arbuscular mycorrhizal fungi (AMF) and certain strains of non-pathogenic bacteria can improve plant resistance to biotic stresses. ISR triggered by PGPR and plant growth-promoting fungi (PGPF) can be found in a wide range of plant taxa. Systemic acquired resistance (SAR); however, can be activated by a pathogen infection. Salicylic acid (SA) signaling is associated with the production of pathogenesis-related (PR) genes. Unlike SAR, ISR functions independently of SA, but requires responses to ET and JA. This can be achieved by the induction of defense-related gene expression; although is not always associated with induced PR proteins.

14Previous studies have identified ISR to stimulate PGPR via the SA-dependent pathway rather than the JA/ET-dependent pathway. Other plant hormones, such as auxins, GA, CKs and brassinosteroids, may also contribute to plant immunity. Hormonal crosstalk is thought to allow the cultivation and exert their immunological growth and defense reactions.

15PGPR are involved in diverse mechanisms to enhance plant growth and/or act as BCAs. Crop production promotion and disease management could be investigated together to ensure sustainability and cost-effectiveness of agricultural systems. Thus, effective PGPR strains can promote stress tolerance and nutrient absorption, plant development, and battling fungal/bacterial diseases. Thus, this appears to be a win-win situation to the PGPR strain and the host plant.

Challenges of employing PGPR as BCAs

16PGPR-based biocontrol provides effective and long-lasting disease management. Europe and the United States are the most promising marketplaces for biocontrol products, followed by South America. Although many PGPR have been tested in vitro and commercially proven as BCAs, new biocontrol products have been released from research activities carried out in the United States and Europe. In general, the market of BCAs and their products is growing; yet, it is not well-adopted compared with chemical pesticides as the most common crop management method.

17Before being publically accepted/registered as a commercial BCA, there are certain requirements/needs that have to be taken into consideration. As such, researchers should improve the efficacy of BCAs to manage certain disease(s). This can be achieved by having a BCA that has as many beneficial characteristics and mechanisms of action as possible. Such characteristics may include, but not limited to, the ability of the BCA to grow fast in vitro, produce a wide range of bioactive metabolites, possess high rhizosphere competence abilities, enhance plant growth performance, be environmentally safe, have the compatibility with other rhizobacteria/fungi, and be tolerant to abiotic stresses. Successful colonization of root tissues and/or the rhizosphere is a critical component for any PGPR strain to be an effective BCA; thus, to perform well against plant pathogens. On the other hand, performance of the inoculated PGPR may vary, depending on the survival rate in the soil, crop compatibility, interaction with other local microbial species and the environmental factors. Survival and colonization are major components when identifying effective BCA isolates. In vitro antagonism experiments are often used to investigate the effect of bacterial isolates on certain diseases, prior to greenhouse and/or field trials.

18Performance of PGPR is generally assessed according to the geographical areas, soil types, host crop species, and under various environmental conditions. BCA growth is often easier to monitor under controlled conditions, i.e., greenhouses. The preference of this stage by most researchers could be attributed to the stability of environmental conditions. Greenhouse experiments evaluating the performance of BCAs under controlled conditions can provide strong theoretical and practical support for the application of PGPR in the field. Thus, this ensures the feasibility and efficacy of PGPR for commercial horticulture production, disease management and climate change conditions such as those found under field conditions.

19PGPR stability is also influenced by the method, formulations, transportation, and storage conditions. To achieve high levels of the BCA survival, one should improve the formulation technology, increase the shelf-life of the BCA product, optimize the production of targeted microbial types and achieve low-cost production at large scales. Many scientists have attempted to extend the shelf-life of PGPR by decreasing the storage temperature and/or modifying the combinations of additives. Extensive research on the risks and benefits of BCAs is also required, because agricultural disease management approaches rely on this balance.

20Due to the diverse modes of action, identification, characterization, the registration of promising PGPR strains take time and require academic-industry collaborations. Using natural sources (e.g., BCAs) to control pathogens also poses a set of legal and ethical issues that may threaten the local biodiversity. In that regard, new species/populations of BCAs have been restricted from entering specific countries. For commercial uses, the application of PGPR in protected environments such as greenhouses is much easier, due to a more isolated and controlled environment delivery and potentially less negative ecological consequences. Another challenge that is linked to the widespread implementation of PGPR-based biocontrol is the regulatory problems. Currently, each country has its regulatory system that greatly vary among them.

21High development costs for new commercial BCAs, for example, have been identified as a barrier to the BCA industry’s expansion in Australia. The high regulatory expenses of importing new BCAs into Australia is one of the most serious challenges. BCA registration requies tight coordination among governmental institutes, universities, and industrial sectors to facilitate the assessment and commercialization of new BCAs and their products. The shortage of programs for financial and ecological benefits can also be added as a challenging problem. For global marketing and local practical applications, commercialization should follow international legislation. The International Biological Control Organization (IOBC) have gathered academicians, researchers and practitioners from different sectors/fields to identify the barriers and provide recommendations to overcome these limitation.

22When compared to chemical pesticides, which are more reliable and predictable, farmers could notice little or no economic gain. Such programs, including local seminars, training workshops and free conferences may increase awareness about the application of BCA in specific farming areas. Finally, PGPR-based biocontrol can hold a lot of promises to reduce agrochemicals use in agriculture. The widespread use of PGPR as BCAs requires massive effort from regulatory bodies and crop growers to convince the public and earn their trust in the capacity of the new BCA products to manage diseases and increase crop yields. High-value crop production in greenhouses could be an ideal place to test the efficacy of PGPR as BCAs in response to different abiotic stresses. Based on recent successful greenhouse trials, BCAs can be used in the field for managing disease and associated agricultural plant growth enhancement.

Rhizobacteria as BCAs

23In the past few decades, rhizobacteria have gained attention when applied to grains, seeds, roots, and/or soils to help the plant grow and develop. Rhizobacteria are important for N2 fixation, promotion of plant growth, and biological control of plant pathogenic microorganisms. Recently, various microbial species are presently used in bacterization, containing Azospirillum, Azotobacter, Bacillus, Rhizobium, Serratia, Stenotrophomonas, Streptomyces Acinetobacter, Agrobacterium, Alcaligenes, Arthrobacter, Bradyrhizobium, Frankia, Pantoea, Pseudomonas, and Thiobacillus. Many plant diseases associated with nematodial, bacterial and fungal infections have been reported to be managed by PGPR. The use of BCAs has been controversial in suppressing nematode populations because other soil microorganisms and the host plant can be adversely affected. To manage diseases associated with plant-parasitic nematodes a combination of biological management, nematicides, organic soil amendments, and crop rotation have been used. In vitro culture filtrates of a strain of Pseudomonas sp. can suppress juvenile mortality of Meloidogyne javanica; thus, considerably reduce root gall and nematode population, and enhance plant development and yield. Furthermore, inoculations with Bacillus spp. affect nematode behavior and feeding. Pseudomonas striata, Pseudomonas fluorescens, and B. subtilis strains also overturn the population of nematodes (Table 1; ). Root-knot nematode (RKN) infestations have been successfully managed via biological management using Bacillus isolates. Few studies have reported the endophytic P. fluorescens and Bacillus spp. to promote systemic resistance in crops against nematodes owing to the increased activities of phenylalanine ammonia-lyase, polyphenol oxidase, and peroxidase, as defense-related enzymes for producing antagonistic chemicals and altering explicit root exudates such as amino acids and polysaccharides. P. fluorescens isolates increased defense enzymes in tomatoes resistant to RKN. In comparison with the control, the application of P. fluorescens and Paecilomyces lilacinus resulted in low nematode community in roots, tubers and soils.

24According to, losses resulting from post-fresh fruit and vegetable harvest in India ranged between 4.6% and 15.9%. Although fungicides can inhibit the growth of phytopathogens, their use causes problems to the environment as well as the human and animal health. The most environmentally acceptable practice to control post-harvest fungal diseases is by using BCAs. In general, BCAs can protect plants from fungal diseases, and are currently a viable option to manage post-harvest diseases associated with plant pathogens. In agriculture, BCAs can offer a number of advantages, including the reduction in the causing agents, farming preservation, minimum labor, soil, water plant contamination, and waste management difficulties. Fungal species, such as Alternaria, Aspergillus Penicillium, and Fusarium producing mycotoxins, are harmful to green vegetables and cause post-harvest diseases. Mycotoxins, such as fumonisin, ochratoxins, aflatoxins and other toxins, are released in vegetables and fruits infected with the fungal pathogens, Fusarium, Alternaria, and Aspergillus. The use of biopriming and pelletizing techniques of Serratia plymuthica HRO-C48 alongside Verticillium dahliae in canola plants revealed a significant biocontrol; thus, providing evidence of the ability of BCAs to manage diseases comparable to chemical fungicides.

25Bacillus spp. produce a variety of compounds involved in the biocontrol of phytopathogens on various plants, including potato, rice, tomato, wheat, groundnut, brinjal, chickpea, and cucumber. Bacillus sp. BS061 isolate can mitigate the effect of Botrytis cinerea to reduce the occurrence of gray mold and powdery mildew diseases in strawberry and cucumber. found that Pectobacterium carotovorum SCC1 can manage soft rot disease in tobacco plants when conjugated with B. subtilis strain B4 and BTH fungicides. The root-knot and root rot pathogens are often suppressed when Pseudomonas spp. are used as BCAs. revealed that PGPR isolates had antifungal activities in mungbean plants against Rhizoctonia solani, Macrophomina phaseolina, F. solani, and F. oxysporum. These isolates can also be used to prevent fungal infections that cause root rot disease. The application of the bacterial BCA, Pseudomonas aeruginosa, can manage anthracnose in the chili pepper against the causal pathogen Colletotrichum capsici. P. aeruginosa can also induce systemic resistance of chili pepper to anthracnose.

26Synthetic chemical pesticides are mainly used for post-harvest disease management. Thus, this may lead to plant pathogen resistance, soil deterioration, and toxicological hazards for the humans and the environment. Nowadays, a general trend, as a result, has been shifted toward finding an alternative to the use of agrochemicals in plant disease management. Compared to synthetic chemical fungicides, the use of microbial antagonists or BCAs has become a “hot” topic due to the numerous advantages as non-hazardous, green, economical and feasible applications to control post-harvest pathogen infections.

Fungi as BCAs

27Fungal BCAs are able to antagonize plant pathogens and protect their host plants. For example, several strains of Trichoderma have been developed as BCAs against the fungal pathogens Penicillium, Fusarium, Aspergillus, Alternaria, Pythium, Rhizoctonia, Phytophthora, Pyricularia, Botrytis, and Gaeumannomyces. As a BCA, Trichoderma can suppress various air- and soil-borne plant pathogens; thus, can be conceivably used as biopesticides in greenhouse and/or field trials. According to, certain strains of nematophagous fungi can manage the populations of Meloidogyne enterolobii in an integrated pest management (IPM) approach. AMF could also protect crops against soil-borne pathogens, including RKN, albeit the unclear mechanisms of antagonism.

28The use of nematophagous and endoparasitic fungi has been deployed as antagonists to suppress RKN. The talc-based formulation of the fungal BCA, Paecilomyces lilacinus, was found to be more active in reducing the population of Meloidogyne incognita in soils cultivated with tomato plants. The efficiency of P. lilacinus in controlling nematodes was observed in several horticultural crops, including tomato, okra, and capsicum. The most widely used BCA for plant-parasitic nematodes is the fungus P. lilacinus, which has shown an appropriate replacement to synthetic chemical control in pre- and post-planting applications. P. lilacinus infects eggs, juveniles and females of M. javanica by direct hyphal penetration. P. lilacinus can boost tomato yield while reducing the population of M. incognita in the soil and on the roots. RKN management can also be achieved by using P. lilacinus and Bacillus firmus either individually or in combination. However, the mixture of P. lilacinus and B. firmus applied in soils 2 weeks prior to tomato transplantation showed the best practice to control Meloidogyne spp..

29Coating the seed with Trichoderma viride and P. lilacinus effectively reduced the nematode population in the soil. Species of Aspergillus and Paecilomyces were found to be antagonistic to M. incognita when compared to the single bio-agent treatment; thus, resulting in enhanced plant growth (Table 1; ). developed a management technique using the nematophagous fungus Pochonia chlamydosporia to manage RKN for the purpose of organic vegetable production. Okra seeds treated with Trichoderma harzianum, T. viride, P. lilacinus, P. chlamydosporia, and P. fluorescens at 20 g kg−1 seed signifcantly reduced the nematode population in the soil and promoted plant growth development. have reported that P. chlamydosporia exhibited nematicidal effects against M. incognita on infected common bean under greenhouse condition. Trichoderma spp. synthesizing chitinases, lytic enzymes, proteases, and glucanases were found to manage vegetable crop diseases. T. harzianum, T. viride, and T. hamatum have nematocidal properties when they colonize the roots of host plant and enhance their growth performance. Because crop yield is mainly influenced by climatic conditions, agronomic factors, pests, and nutrient availability in the soil, researchers must consider these factors in the selection of fungal BCAs.

30Likewise, Trichoderma spp. can prevent nematode penetration and development in plants through the regulation of metabolites. have shown that the M. incognita and other RKN are more affected by the culture filtrate of Trichoderma. Species of Trichoderma can produce viridin, a nematicidal chemical. Gliotoxin and acetic acid, have also been reported as nematicidal substances in the culture filtrates of T. virens and T. longibrachiatum, respectively. In response to M. incognita, T. polysporum has the ability to synthesize cyclosporine, the peptide that has a nematicidal action. The efficacy of P. lilacinus, as bioagents or bioproducts in mixtures, significantly decreased the number of M. incognita on eggplant. It has been shown that different sources of N and carbon affect the growth and antagonism of Trichothecium roseum and T. viride. Although fructose and lysine were mostly effective against T. viride, rhamnose and glycine were more effective against T. roseum. There is an adverse effect of fungal culture filtrates on the egg hatching and juvenile mortality of RKN. Plants treated with the fungal BCA, Lecanicillium muscarium, decreased the number of galls in plants, eggs, juveniles (J2) and the reproduction factor (Rf) of Meloidogyne hapla compared to control plants. In addition, plant growth was greatly improved when treated with L. muscarium. Trichoderma and P. lilacinum isolates dramatically reduced nematode egg number and mass, minimized root gal injury, and improved plant root mass development when compared to control plants without the fungal BCAs. Overall, more than 30 genera and 80 species of fungi can parasite RKN. have demonstrated that the fungus, Colletotrichum falcatum, has antagonistic potential against the fungal pathogens Penicillium citrinum, Botrytis cinerea, and Trichodermum glaucum. Moreover, other fungi, such as Ampelomyces speciosus and Acremonium alternatum, have the ability to degrade the mycelia of fungal pathogens, indicating that not only rhizobacteria, but also fungi can serve as BCAs.

Mechanisms used by MBCAs

31Understanding the appropriate conditions for implementing proper programs against plant pathogens requires collaborations between different research groups focusing on the mechanisms associated with MBCAs to manage diseases on plants. In the last two decades, extensive research has focused on the antifungal effect, rhizosphere colonization, and crop benefits linked to MBCA. Thus, the products of MBCA on plant fungal pathogens and their impacts on plants are illustrated in Figure 2. The primary strategy of MBCA are summarized as antibiosis, competition for micronutrients such as iron, mycoparasitism, production of hydrolytic enzymes, and induction of ISR in host plants (Figure 3). In addition, the production of metabolites that are inhibitory to plant pathogenic rhizosphere microorganisms is considered one of the major biocontrol activities in many MBCA.

32In several microorganisms, antibiosis, also known as secondary metabolites, results in the production of various toxic chemicals to pathogenic microorganisms; thus, they are suitable for the plant growth and development. An antibiotic-producing microorganism must manufacture the antibiotic in the correct microniche on the root surface to effectively control plant diseases. Actinobacteria (8,700 distinct antibiotics), bacteria (2,900), and fungi (4,900) can produce massive amounts of antibiotics. Mutagenesis has been reported to be successful in determining the role of antibiotics generated by bacterial BCA isolates to control pathogens associated with plant infections.

33have investigated the lipopeptides (surfactin, iturin, and fengycin) in Bacillus spp. It has also been reported that pyrrolnitrin, 2,4-diacetylphloroglucinol (DAPG), and phenazine can be potential antibiotic metabolites in Pseudomonas. Pseudomonas spp. have the ability to generate pyoluteorin, siderophores, and cyanide, among other antimicrobial chemicals. In addition, the enzymatic activity of cellulase, proteases, β-glucanase, and chitinase can lyse fungal cells. Antibiotic metabolites produced by Pseudomonas spp. are regulated by complex regulatory networks and high number of transcription factors. Significant classes of antifungal antibiotics are lipopeptides or peptides that are produced by the ribosomes or non-ribosomes of Bacillus spp. (Figure 2). have discussed that antibiotics can be generated by BCA strains in soil.

34Bacillus spp. have the ability to produce various biologically active chemicals that hinder the development of several crop diseases. An investigation by revealed that the quantity of antibacterial or antifungal chemicals produced by Bacillus spp. in the rhizosphere is somewhat little, causing doubts on the role of rapid management of plant diseases. Several isolates of P. fluorescens were found to generate cyclic lipopeptides (CLPs), such as viscosinamide, amphisin and tensin, that were effective against fungal pathogens, R. solani and Pythium ultimum.

35Biological control is an application of beneficial organisms, genes, and their products in the form of metabolites. Several in vitro metabolites of microorganisms were utilized to control pathogenic infections. As a result, these secondary metabolites can be utilized as products of a BCA; and thus, they are effective to ameliorate the negative impact of other pathogenic microorganisms while also being environmentally friendly. Antimicrobial activities of some fungal BCAs may also exhibit antagonistic effects against fungi. For example, Trichoderma spp. are commonly found in soil and provide a variety of volatile and nonvolatile compounds. Volatile compounds, such as cyanide, hydrogen, ET, aldehydes, ketones and alcohols; and nonvolatile substances, such as peptides, can inhibit the mycelial growth in some pathogenic fungi. Many antifungal compounds, such as gliovirin, gliotoxin, viridiol, heptelidic acid, valinotrocin, and viridin can be produced by Gliocladium virens, which acts as a MBCA. demonstrated that gliotoxin can effectively reduce the fungal pathogens, Pythium aphanidermatum, M. phaseolina, Pythium debaryanum, R. solani, Sclerotium rolfsii, and Rhizoctonia bataticola. have stated that the production of 1-hydroxy-3-methylanthraquinone, 1,8-dihydroxy-3-methyl-anthraquinone, T22 azaphilone, harzianolide, T39butenolide, and harzianopyridone by T. harzianum strains T22 and T39 has the ability to control the plant fungal pathogens Leptosphaeria maculans, Phytophthora cinnamomi, R. solani, Botrytis cinerea, and P. ultimum. Several secondary metabolites have been isolated and recognized by different methods such as high-performance liquid chromatography (HPLC) and gas chromatography–mass spectrometry (GC–MS). have investigated three isolates, Cg-5, Cg-6, and Cg-7, that produce the secondary metabolite, chaetoglobosin A, in the culture filtrate detected by the UV spectrum at 250 nm. The antimicrobial compounds released by fungi may also control phytopathogens during post-harvest infections. The post-harvest infection causes excessive damages in vegetables and fruit (Figures 4, 5).

Competition in the rhizosphere

36Co-existence of two living microorganisms occurs when a population of a particular microorganism strives to achieve something greater, such as space or food supply. Pathogenic and non-pathogenic microorganisms compete for food and resources in the rhizosphere. It has been known for a long time that non-pathogenic plant-associated bacteria are usually protected by colonizing plants and, as a result, this debilitate the limited available substrates and prevent the spread of the pathogens. The abilities of any microorganism to compete with others for essential nutrients and exudates secreted by the plant roots and their capability of colonizing into the root surface of host plants are termed rhizosphere competence. In the rhizosphere, the beneficial interactions between plants and microorganisms can regularly occur; thus, promoting growth and/or enhancing tolerance to biotic and abiotic stresses in plants.

37Rhizosphere competence can successfully establish microbial communities on or near the plant roots. Plant root colonization by PGPM can protect plants against pathogens and promote plant growth, and chemotaxis to root exudates is considered as an essential prerequisite for efficient root colonization. Microbial community in the rhizosphere is found to be important shortly after planting, but regularly decreases during the cropping season. have reported in vitro antagonism of 15 Pseudomonas strains to R. solani in the rhizosphere. Only Pseudomonas jessenii RU47 has been effective to bottom rot disease on lettuce caused by R. solani. Tryptophan can stimulate the growth of adventitious roots and root hairs of the IAA-producing B. subtilis SRB28, which can colonize root tissues in sorghum, produce microcolonies, and persist in the rhizosphere.

38Rhizosphere microorganisms promoting plant growth, represent a wide range of species. PGPM are categorized according to their ability to colonize roots, survive, increase their numbers in the microhabitats on the root surface, compete with indigenous microorganisms, and increase resistance in host crops. PGPM can not only promote plant development, but also they are often used as BCAs to suppress plant diseases. The plant-associated Bacillus, Pseudomonas, Lactobacillus and actinobacteria strains are used as biofertilizers and BCAs in agriculture. Furthermore, Acetobacter, Serratia, Azospirillum, Paenibacillus Burkholderia, Herbaspirillum, and Rhodococcus can also enhance growth in crop plants. reported that a number of PGPR traits, such as production of siderophore, solubilization of phosphate, synthesis of IAA, and antagonism against fungal pathogens, were found to stimulate growth in tea plants. This has been linked with an increase in the number of shoots and leaves under greenhouse and field conditions. In general, soils with active microbial ecosystems and high organic matter require less fertilizer than soils without any microorganisms.

39Biofertilizers made from microorganisms that help plants obtain their nutrients can colonize plant roots, to solubilize P, produce siderophore and HCN, and fix N2 (Figure 5;; ). N2 fixation by PGPR provides a considerable amount of N to the farming systems worldwide, with estimations ranging from 20 to 22 Tg N annually, which may reach in some years to up to 40 Tg N. Moreover, it has been reported that the biological N2 fixation may provide the African countries approximately 12 Tg N year−1. Crop yields might be limited by other nutritional elements, such as Fe and Zn. Similar to P, Fe is highly abundant in soils; yet, it is not available to plants in most cases. The synthesis of organic acids or siderophores by various PGPR strains increases Fe accessibility.

40Auxins are produced by a variety of PGPR that is involved in plant growth and development and plant architecture. The auxin, IAA, produced by PGPR has received much of attention. It is highly involved during PGPR-plant interactions. Auxin-producing PGPR have been reported to cause transcriptional alterations in the hormone levels, resistance/tolerance to biotic/abiotic stress, and regulation of cell wall-linked genes. IAA may also increase root length, enhance root biomass, while reducing the size and density of stomata. Plant growth and development can also be stimulated by the induction of auxin-response genes.

41In addition, PGPRs can produce GA and CKs, although the exact process remains unknown. A limited number of PGPR strains can produce huge amounts of GA; thus, significantly increase the shoot growth in plants. Exudates are expected to contain organic acids, sugars, and amino acids, which are highly abundant in the cytoplasm of plants, but low quantities of complex secondary metabolites, including flavonoids, terpenes, and phenolic substances, which may attract certain rhizosphere microorganisms. Plant health and physiology could be improved due to PGPR colonization of roots, resulting in more seeds and blooms. According to, actinobacteria isolated from the rhizosphere of bamboo was found to be capable to suppress the fungal pathogen, Fusarium sp., while boosting plant growth and development. Harzianic acid produced by T. harzianum not only promoted plant growth, but also showed antifungal effects against Pythium irregulare, Sclerotinia sclerotiorum, and R. solani, even at very low doses. MBCA are important to the advancement and improvement of plant growth development, as well as the prevention of the attack of plant pathogens.

Future perspectives

42Biological control management is one of the most promising applications for sustainable agriculture. It is a proven to be eco-friendly agricultural pest control approach. This strategy uses living microorganisms to reduce the pest populations in a conservative, dependable, and ecologically amicable manner. In the developed countries, biological control is a remarkable tool to achieve sustainable, less expensive, and safe pest control management; thus, offering benefits to breeders and consumers when compared to synthetic (chemical) pest management. This review has provided an overview of antagonistic modes of action of MBCA, which are regarded as practical substitutions to synthetic fungicides as well as stimulation of plant growth and development for post-harvest purposes. Researchers working in the field of MBCA must anticipate new and distinct questions, in order to provide solutions that help in the development of novel biocontrol technologies/applications. Bioinformatics, molecular biology, analytical chemistry, and biostatistics have also shed lights on new research areas aimed at defining the MBCA-pathogen-plant interaction.

43One should not neglect the environmental conditions that also play a crucial role in the process of antagonism and the mode(s) of action of MBCA. The following conditions should be taken into consideration, when researchers isolate, identify and characterize a MBCA strain:

441. The spread of the infection associated with nematodes, fungi, and bacteria, as well as the potential antagonists in the micro- and macro-environment of the interaction.

452. The best conditions for the application of BCA.

463. The reaction of MBCA to the local communities and to various management strategies.

474. The limiting factors of effective colonization and articulation of biological control characteristics.

485. The plant components and dynamics that induce host defense.

Conclusion

49Many crops are affected by various pathogens. PGPM of pests and diseases in crops are generally regarded as a sustainable alternative for conventional chemical plant protection. These PGPR and PGPF acting as MBCAs are a safe, effective, and environmentally friendly form of pest management that do not harm the environment or the human health. PGPR/PGPF are antagonistic microorganisms that could be exploited as biopesticides and biofertilizers for better plant health and growth improvement. Adoption of PGPR/PGPF-based biopesticides/biofertilizers on a commercial scale may substantially contribute to sustainable agriculture and safe environment. This review has provided an overview on the research related to PGPMs, their benefits and effects as potential bioinoculants for plant growth and biological control. The increased use of PGPMs requires the achievement of accurate selection of beneficial PGPR/PGPF strains and consortia, the mechanisms underlying PGPM-plant interactions, and the ability to prepare for future agricultural challenges.

Author contributions

50All authors listed have made a substantial, direct, and intellectual contribution to the work and approved it for publication.

Funding

51This project was funded by Abu Dhabi Education and Knowledge (Grant #: 21S105) to KE-T and Khalifa Center for Genetic Engineering and Biotechnology-UAEU (Grant #: 31R286) to SA.

Conflict of interest

52The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

53All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Bacterial and Fungal Biocontrol Agents for Plant Disease Protection: Journey from Lab to Field, Current Status, Challenges, and Global Perspectives · 2023
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