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Role of Arbuscular Mycorrhizal Fungi in Plant Growth Regulation: Implications in Abiotic Stress Tolerance

Naheeda Begum, Cheng Qin, Muhammad Abass Ahanger and 5 more

Frontiers in Plant Science · 2019 · Review · CC BY

doi:10.3389/fpls.2019.01068

Abstract

Abiotic stresses hamper plant growth and productivity. Climate change and agricultural malpractices like excessive use of fertilizers and pesticides have aggravated the effects of abiotic stresses on crop productivity and degraded the ecosystem. There is an urgent need for environment-friendly management techniques such as the use of arbuscular mycorrhizal fungi (AMF) for enhancing crop productivity. AMF are commonly known as bio-fertilizers. Moreover, it is widely believed that the inoculation of AMF provides tolerance to host plants against various stressful situations like heat, salinity, drought, metals, and extreme temperatures. AMF may both assist host plants in the up-regulation of tolerance mechanisms and prevent the down-regulation of key metabolic pathways. AMF, being natural root symbionts, provide essential plant inorganic nutrients to host plants, thereby improving growth and yield under unstressed and stressed regimes. The role of AMF as a bio-fertilizer can potentially strengthen plants' adaptability to changing environment. Thus, further research focusing on the AMF-mediated promotion of crop quality and productivity is needed. The present review provides a comprehensive up-to-date knowledge on AMF and their influence on host plants at various growth stages, their advantages and applications, and consequently the importance of the relationships of different plant nutrients with AMF.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 17, 2026. Paragraph numbers are ours, so an answer can point at one.

Introduction

Arbuscular mycorrhizal fungi (AMF) facilitate host plants to grow vigorously under stressful conditions by mediating a series of complex communication events between the plant and the fungus leading to enhanced photosynthetic rate and other gas exchange-related traits, as well as increased water uptake. Numerous reports describe improved resistance to a variety of stresses including drought, salinity, herbivory, temperature, metals, and diseases due to fungal symbiosis. Nearly 90% of plant species including flowering plants, bryophytes, and ferns can develop interdependent connections with AMF. AMF form vesicles, arbuscules, and hyphae in roots, and also spores and hyphae in the rhizosphere. Formation of hyphal network by the AMF with plant roots significantly enhances the access of roots to a large soil surface area, causing improvement in plant growth. AMF improve plant nutrition by increasing the availability as well as translocation of various nutrients. AMF improve the quality of soil by influencing its structure and texture, and hence plant health. Fungal hyphae can expedite the decomposition process of soil organic matter. Furthermore, mycorrhizal fungi may affect atmospheric CO2 fixation by host plants, by increasing “sink effect” and movement of photo-assimilates from the aerial parts to the roots. Keeping in view the importance of AMF and the research advancements related to their applications in agriculture, the present review focuses on the role of AMF as bio-fertilizers in the regulation of plant growth and development with improved nutrient uptake under stressful environments, and the level to which AMF can enhance plant growth under stressful environments.

Background of Arbuscular Mycorrhizal Fungi

AMF are soil-borne fungi that can significantly improve plant nutrient uptake and resistance to several abiotic stress factors. A majority of the species of AMF belong to the sub-phylum Glomeromycotina, of the phylum Mucoromycota. Four orders of AMF, namely, Glomerales, Archaeosporales, Paraglomerales, and Diversisporales, have been identified in this sub-phylum that also include 25 genera. They are obligate biotrophs and ingest plant photosynthetic products and lipids to accomplish their life cycle. AMF-mediated growth promotion is not only by improving water and mineral nutrient uptake from the adjoining soil but also by safeguarding the plants from fungal pathogens. Therefore, AMF are vital endosymbionts playing an effective role in plant productivity and the functioning of the ecosystem. They are of key importance for sustainable crop improvement.

Characteristics of AMF Symbiosis

The symbiosis of AMF with plants had been reported 400 million years ago. Such types of links are established as a succession of biological processes, which lead to a variety of useful effects in both natural ecosystem and agricultural biotas. The symbiotic association of AMF is a classic example of mutualistic relationship, which can regulate the growth and development of plants. The mycelial network of fungi extends under the roots of the plant and promotes nutrient uptake that is otherwise not available. The fungal mycelium colonizes roots of many plants even if they belong to different species, resulting into a common mycorrhizal network (CMN). This CMN is considered as a primary component of the terrestrial ecosystem with its significant effects on different plant communities, particularly on invasive plants and the fungal-mediated transport of phosphorus (P) and nitrogen (N) to plants. Moreover, communal nutrients also relocate from fungi to the plant, along with other related effects, which is probably why AMF improve plant tolerance to biotic and abiotic factors. They have the ability to improve characteristics of soil and consequently encourage plant development in normal as well as in stressful circumstances. AMF colonization improves tolerance of plants to stressful cues by bringing about several changes in their morpho-physiological traits. AMF are considered as natural growth regulators of a majority of terrestrial flora. AMF are used as bio-inoculants, and researchers encourage their use as prominent bio-fertilizers in sustainable crop productivity. Furthermore, AMF-inoculated soil forms more constant masses and significantly higher extra-radical hyphal mycelium than do the non-AMF-treated soils. Glomalin-related soil protein (GRSP) is believed to maintain water content in soils exposed to different abiotic stresses, which later on regulates water frequencies between soil and plants, automatically triggering plant development. Glomalin contains 30–40% C and its related compounds that safeguard soil from desiccation by enhancing the soil water holding capacity. Growth-related functions, for example, stomatal conductance, leaf water potential, relative water content (RWC), PSII efficiency, and CO2 assimilation are affected by AMF inoculation. AMF also help improve water stress tolerance by physiological alteration of the above-ground organs and tissues. Furthermore, inoculation of AMF improves the accumulation of dry matter and enhances water moisture uptake, consequently improving plant tolerance against stresses like drought and salinity. Exploitation of AMF for plant growth in various biological ecosystems can contribute greatly to organic culturing for growth promotion and yield maximization ( Figure 1 ).

AMF as a Bio-fertilizer

Bio-fertilizers are a mixture of naturally occurring substances that are used to improve soil fertility. These fertilizers are very useful for soil health as well as for plant growth and development. Different research studies conducted on AMF during the past two decades have highlighted their countless benefits on soil health and crop productivity. Therefore, it is widely believed that AMF could be considered as a replacement of inorganic fertilizers in the near future, because mycorrhizal application can effectively reduce the quantitative use of chemical fertilizer input especially of phosphorus. Continuous use of inorganic fertilizers, herbicides, and fungicides has caused various problems to soil, plants, and human health, through their damaging impact on the quality of food products, soil health, and air and water systems. It is believed that AMF can possibly lower down the use of chemical fertilizers up to 50% for best agricultural production, but this estimate depends on the type of plant species and the prevalent stressful regimes ( Table 1 ).

AMF and Mineral Nutrition

Excessive land use may have a drastic impact on the overall biodiversity, which in turn may affect the ecosystem function as shown by several reports. A prominent role of such symbiotic relationship is to transfer nutrients, for example, organic carbon (C), in the form of lipids and sugars. AMF colonization is widely believed to stimulate nutrient uptake in plants ( Table 1 ). It is evident that inoculation of AMF can enhance the concentration of various macro-nutrients and micro-nutrients significantly, which leads to increased photosynthate production and hence increased biomass accumulation. AMF have the capability to boost the uptake of inorganic nutrients in almost all plants, specifically of phosphate. AMF are also very effective in helping plants to take up nutrients from the nutrient-deficient soils. Apart from the macronutrients, AMF association has been reported to increase the phyto-availability of micronutrients like zinc and copper. AMF improve the surface absorbing capability of host roots. Experimental trials on tomato plants inoculated with AMF have shown increased leaf area, and nitrogen, potassium, calcium, and phosphorus contents, reflecting enhanced plant growth. AMF develop symbiosis with roots to obtain essential nutrients from the host plant and consequently provide mineral nutrients in return, for example, N, P, K, Ca, Zn, and S. Thus, AMF provide nutritional support to the plants even under inappropriate conditions inside the root cells. AMF produce fungal structures like arbuscules, which assist in exchange of inorganic minerals and the compounds of carbon and phosphorus, ultimately imparting a considerable vigor to host plants. Therefore, they can significantly boost the phosphorus concentration in both root and shoot systems. Under phosphorus-limited conditions, mycorrhizal association improves phosphorus supply to the infected roots of host plants. For example, Pi uptake rate was markedly improved in the AMF-colonized maize plants. Increased photosynthetic activities and other leaf functions are directly related to improved growth frequency of AMF inoculation that is directly linked to the uptake of N, P, and carbon, which move towards roots and promote the development of tubers. It has been observed that AMF maintain P and N uptake ultimately helping in plant development at higher and lower P levels under different irrigation regimes. For example, mycorrhizal symbiosis positively increased the concentrations of N, P, and Fe in Pelargonium graveolens L. under drought stress. reported improved levels of P, Ca, and K in Euonymus japonica under salinity stress due to instant fungus attachment. In another study, AMF-inoculated Pistachio plants exhibited high levels of P, K, Zn, and Mn under drought stress. In addition, AMF inoculation improved P and N contents in Chrysanthemum morifolium plant tissues and increased seedling weight by improving water content and intercellular CO2, P, and N contents in Leymus chinensis.

It is believed that AMF improve the uptake of almost all essential nutrients and contrarily decrease the uptake of Na and Cl, leading to growth stimulation. The extra-radical mycelium (ERM) can effectively improve nutrient uptake, thereby improving plant growth and development. Nitrogen (N), being a main source of soil nutrition, is a well-known mineral fertilizer, even in those areas where there are enough livestock and farm-yard manure (FYM). Many scientists have reported the role of AMF in uptake of soil nutrients, especially of N and P, which can effectively promote the growth of host plants. In higher plants and some crops, N is a premier growth limiting factor. Several studies have explained that AMF have the ability to absorb and transfer N to the nearby plants or host plants. have demonstrated AMF mediated increased allocation of shoot biomass to panicles and grains through increased N and P redistribution to panicles particularly under low fertilizer levels. Translocation of N into seeds is enhanced from heading to maturity. AMF after establishing symbiosis produce extensive underground extra-radical mycelia ranging from the roots up to the surrounding rhizosphere, thereby helping in improving the uptake of nutrients specifically N. The interaction of salinity stress and AMF significantly affects the concentrations of P and N and the N:P ratio in plant shoots. Recently, it has been reported that native AMF treatments produce significant alterations in the N contents of crop plants.

It has been widely accepted that fungi have the ability to take substantial amount of N from dead and decomposed material that later increases their fitness to grow and stay alive. Apart from this, large biomass and increased N requirements for AMF render them the main stakeholder of global N pool that is equivalent in scale to fine roots. Thus, they play a pivotal role in the N cycle. The AMF extra-radical hyphae can absorb and assimilate inorganic N. Several studies have shown that approximately 20–75% of the total N uptake of AM plants can be transferred by the AMF to their hosts. Increased N in AMF-colonized plants evidently results in higher chlorophyll contents, as chlorophyll molecules can effectively trap N. Other evidences favoring the AMF-mediated improvement in plant N nutrition can also be seen in the literature. AMF inoculation improves C and N accumulation and N assimilation under ambient and elevated CO2 concentrations. For example, in olive plants, AMF were reported to improve growth, accumulation of micro-nutrients and macro-nutrients, and their allocation in the plantlets grown under increased levels of Mn.

Enhancement of plant nutrition and maintenance of Ca2+ and Na+ ratio are the significant dynamic attributes that help improve beneficial aspects of AMF colonization on overall plant performance. Improved growth and levels of protein, Fe, and Zn were found in mycorrhizal chickpea. Moreover, different reports have shown enhanced activity of a K+ transporter in the mycorrhizal roots of Lotus japonicus. Moreover, two meta-analysis reports that appeared a few years ago showed the role of mycorrhizal symbiosis to various micro-nutrients in crops (;; as reviewed by ). reported that the specified fungal association enhanced the contents of macronutrients such as N, P, K, Ca, and Mg of Antirrhinum majus under drought. AMF also proved to be effective in restricting the high accumulation of Na, Mn, Mg, and Fe in roots. Several studies conducted during the last few years have shown that AMF, such as Glomus mosseae and Rhizophagus irregularis exhibited improved heavy metal translocation in the shoot. Micronutrients such as Zn and Cu being diffusion limited in soils are absorbed by plants with the help of mycorrhizal hyphae.

AMF and Plant Yield

Beneficial rhizosphere microorganisms not only can improve the nutrient status of crops, as described above, but also can enhance the quality of crops. For example, AMF-colonized strawberry exhibited increased levels of secondary metabolites resulting in improved antioxidant property. AMF can enhance the dietary quality of crops by affecting and production of carotenoids and certain volatile compounds. observed beneficial effects of AMF on the quality of tomatoes. In another study, have reported increased contents of sugars, organic acids, vitamin C, flavonoids, and minerals due to Glomus versiforme resulting in enhanced citrus fruit quality. Mycorrhizal symbiosis induces enhanced accumulation of anthocyanins, chlorophyll, carotenoids, total soluble phenolics, tocopherols, and various mineral nutrients. AMF have been employed in a large-scale field production of maize, yam, and potato, confirming that AMF possess a considerable potential for enhancing crop yield. AMF can also enhance the biosynthesis of valuable phytochemicals in edible plants and make them fit for healthy food production chain.

have reported that the abiotic stress mitigation by AMF could occur through maintenance of soil pH, thereby protecting its horticultural value. In addition, AMF can also play a critical role in improving the resistance of plants to stressful environments, as described below.

Drought

Drought stress affects plant life in many ways; for example, shortage of water to roots reduces rate of transpiration as well as induces oxidative stress. Drought stress imparts deleterious effects on plant growth by affecting enzyme activity, ion uptake, and nutrient assimilation. However, there is a strong evidence of drought stress alleviation by AMF in different crops such as wheat, barley, maize, soybean, strawberry, and onion. Plant tolerance to drought could be primarily due to a large volume of soil explored by roots and the extra-radical hyphae of the fungi.

Such a symbiotic association is believed to regulate a variety of physio-biochemical processes in plants such as increased osmotic adjustment, stomatal regulation by controlling ABA metabolism, enhanced accumulation of proline, or increased glutathione level. Symbiotic relationship of various plants with AMF may ultimately improve root size and efficiency, leaf area index, and biomass under the instant conditions of drought. Moreover, AMF and their interaction with the host plant are helpful in supporting plants against severe environmental conditions (; Table 1 ). The AMF symbiosis also results in enhanced gas exchange, leaf water relations, stomatal conductance, and transpiration rate. AMF can facilitate ABA responses that regulate stomatal conductance and other related physiological processes. Recently, have demonstrated AMF-mediated enhancement in growth and photosynthesis in C3 (Leymus chinensis) and C4 (Hemarthria altissima) plant species through up-regulation of antioxidant system.

Salinity

It is widely known that the soil salinization is an increasing environmental problem posing a severe threat to global food security. Salinity stress is known to suppress growth of plants by affecting the vegetative development and net assimilation rate resulting in reduced yield productivity. It also promotes the excessive generation of reactive oxygen species. Attempts are being made to explore potential means of achieving enhanced crop production under salt affected soils. One such potential means is the judicious use of AMF for mitigating the salinity-induced adverse effects on plants. Several research studies have reported the efficiency of AMF to impart growth and yield enhancement in plants under salinity stress (;; Table 1 ). reported that AMF enhanced growth rate, leaf water potential, and water use efficiency of the Antirrhinum majus plants. Recently, have reported the beneficial effects of AMF symbiosis on physiological parameters such as photosynthetic rate, stomatal conductance, and leaf water relations under saline regimes. AMF significantly alleviated the deleterious effects on photosynthesis under salinity stress. Mycorrhizal inoculation markedly improved photosynthetic rate, and other gas exchange traits, chlorophyll content, and water use efficiency in Ocimum basilicum L. under saline conditions. AMF-inoculated Allium sativum plants showed improved growth traits including leaf area index, and fresh and dry biomass under saline conditions. Recently, have reported considerable enhancement in fresh and dry weights, and N concentration of shoot and root due to mycorrhizal inoculation under moderate saline conditions.

Furthermore, plants possessing AMF show enhanced synthesis of jasmonic acid, salicylic acid, and several important inorganic nutrients. For example, concentrations of total P, Ca2+, N, Mg2+, and K+ were higher in the AMF-treated Cucumis sativus plants compared with those in the uninoculated plants under salt stress conditions. Mycorrhizal inoculation to Capsicum annuum exhibited enhanced chlorophyll contents, and Mg2+ and N uptake coupled with reduced Na+ transport under saline conditions. In addition, have shown with lettuce that the mycorrhizal plants had higher biomass production, increased synthesis of proline, increased N uptake, and noticeable changes in ionic relations, particularly reduced accumulation of Na+, than those in non-mycorrhizal plants under stress conditions. AMF inoculation can effectively regulate the levels of key growth regulators. For example, and have observed AMF-mediated improvement in cytokinin concentration resulting in a marked photosynthate translocation under salinity stress. In addition, AMF-mediated growth promotion under salinity stress was shown to be due to alteration in the polyamine pool. Furthermore, showed that enhanced strigolactone in AMF-treated plants notably mitigated various salinity effects in lettuce plants. AMF-colonized plants have the ability to decrease oxidative stress by suppressing lipid membrane peroxidation under salinity stress. Furthermore, inoculation of AMF was also observed to enhance the accumulation of various organic acids resulting in up-regulation of the osmoregulation process in plants grown under saline stress. For example, observed an enhanced synthesis/accumulation of certain organic acids in maize plants growing in saline soil, and AMF induced increased production of betaine, confirming the indirect role of AMF in plant osmoregulation under salinity stress.

Heavy Metals

AMF are widely believed to support plant establishment in soils contaminated with heavy metals, because of their potential to strengthen defense system of the AMF mediated plants to promote growth and development. Heavy metals may accumulate in food crops, fruits, vegetables, and soils, causing various health hazards. AMF association with wheat positively increased nutrient uptake under aluminum stress. Plants grown on soils enriched with Cd and Zn exhibit considerable suppression in shoot and root growth, leaf chlorosis, and even death. There are many reports in the literature on uncovering the AMF-induced effects on the buildup of metals in plants (; Table 1 ). Heavy metals can be immobilized in the fungal hyphae of internal and external origin that have the ability to fix heavy metals in the cell wall and store them in the vacuole or may chelate with some other substances in the cytoplasm and hence reduce metal toxicity in the plants. The strong effects of AMF on plant development and growth under severe stressful conditions are most often due to the ability of these fungi in increasing morphological and physiological processes that increase plant biomass and consequently uptake of important immovable nutrients like Cu, Zn, and P and thus reduced metal toxicity in the host plants. It is also believed that enhanced growth or chelation in the rhizospheric soil can cause metal dilution in plant tissues. AMF reportedly bind Cd and Zn in the cell wall of mantle hyphae and cortical cells, thereby restricting their uptake and resulting in improved growth, yield, and nutrient status.

Mycorrhizae can disturb the uptake of different metals into plants from the rhizosphere and their movement from the root zone to the aerial parts. Mycelia of various AMF have a high cation-exchange capacity and absorption of metals. Metal non-adapted AMF settle the polluted soils and reduce uptake and accumulation of heavy metals, as observed in perennial ryegrass (Lolium perenne) in artificially polluted soil with various elements like Cd, Ni, and Zn. AMF are believed to regulate the uptake and accumulation of some key inorganic nutrients. For example, enhanced uptake of Si has been reported in mycorrhiza-inoculated plants like Glycine max and Zea mays. also recorded considerable uptake of Si in spores and hyphae of Rhizophagus irregularis and its transfer to the host roots. It is pertinent that low Cd mobility and toxicity can also be addressed with AMF by increasing soil pH, restoring Cd in the extra-radical mycelium, and binding Cd to glomalin, a glycoprotein. For example, in rice, AMF were very effective in lowering the levels of Cd in both the vacuoles and cell wall, which brought about Cd detoxification. observed that AMF-mediated improved Cd tolerance in alfalfa (Medicago sativa L.) had been possibly due to the modification of chemical forms of Cd in different plant tissues. Various processes that occur through the AMF are immobilization/restriction of metal compounds, precipitation of polyphosphate granules in the soil, adsorption to fungal cell wall chitin, and heavy metal chelation inside the fungus ( Figure 1 ).

Temperature (High and Low)

As soil temperatures increase, plant community reactions may be dependent on AMF interactions for sustainable yield and production. Heat stress significantly affects plant growth and development by imparting i) loss of plant vigor and inhibition of seed germination, ii) retarded growth rate, iii) decreased biomass production, iv) wilting and burning of leaves and reproductive organs, v) abscission and senescence of leaves, vi) damage as well as discoloration of fruit, vii) reduction in yield and cell death, and viii) enhanced oxidative stress. Generally, AMF-inoculated plants show better growth under heat stress than do the non-AMF-inoculated ones. have reported the association of AMF Glomus fasciculatum with plant growth and development leading to positive changes in growth under the conditions of high temperature ( Figure 2; Table 1 ).

AMF can increase plant tolerance to cold stress. Moreover, a majority of reports state that various plants inoculated with AMF at low temperature grow better than non-AMF-inoculated plants. AMF support plants in combating cold stress and eventually improve plant development. Moreover, AMF also can retain moisture in the host plant, increase plant secondary metabolites leading to strengthen plant immune system, and increase protein content for supporting the plants to combat cold stress conditions. For example, during cold stress, AMF-inoculated plants showed an enhanced water conservation capacity as well as its use efficiency. Symbiotic AMF relationship improves water and plant relationships and increases gas exchange potential and osmotic adjustment. AMF improve the synthesis of chlorophyll leading to a significant improvement in the concentrations of various metabolites in plants subjected to cold stress conditions. The role of AMF during cold stress has also been reported to alter protein content in tomato and other vegetables.

AMF and Combined Abiotic Stresses

It is widely accepted that AMF could alleviate various stresses or combination of stresses that include, drought, salinity, temperature, nutrients, and heavy metals. For example, exposure of plants to a combination of drought and salinity causes an enhanced production of reactive oxygen species, which can be highly injurious to plants. Detoxification of reactive oxygen species (ROS) is done by the enzymes that include commonly superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and glutathione reductase (GR). In addition, combined application of drought and salinity to tomato plants inoculated with Scolecobasidium constrictum showed improved biomass production, leaf water relations, stomatal conductance, and Fv/Fm relative to those in non-inoculated plants. Thus, AMF are critical for improving plant growth and yield under stress. Very rare research reports are available in the literature demonstrating the role of AMF in mitigation of combined effects of two or more stresses. AMF symbiosis protects plants against a variety of abiotic stresses using various processes such as improved photosynthetic rate, uptake and accumulation of mineral nutrients, accumulation of osmoprotectants, up-regulation of antioxidant enzyme activity, and change in the rhizosphere ecosystem. Several studies have shown improved nutritional status of AMF plants under osmotic stress conditions resulting from deficit irrigation or salinity. Similarities among the tolerance mechanisms may occur in response to AMF-mediated combined stress adaptations. It is proposed that AMF-mediated alterations in phytohormone profile, mineral uptake and assimilation, accumulation of compatible osmolytes and secondary metabolites, and up-regulation of antioxidant system can be the common mechanisms induced during different stresses. However, specific mechanisms like compartmentation and sequestration of toxic ions, production of phytochelatins, and protein expression can be specific and exhibit a significant change with stress type and the AMF species involved. Changes in root characteristics like hydraulic conductivities can improve the osmotic stress tolerance to considerable levels. have shown that the AMF protected castor bean against saline stress by altering gas exchange traits and the levels of some key metabolites. The said characteristics of AMF may elevate nutraceutical quality of crops and could be of considerable agronomic importance for production and management of different potential crops. However, extensive studies are required to unravel the role of AMF in counteracting the effects of combined stresses.

Conclusion and Future Prospects

A few research reports have already documented the beneficial role of AMF in improving plant growth under stressful environments. Therefore, in this review, the existing information related to the role of AMF has been combined in a coherent way for understanding of AMF symbiotic relationship with a variety of plants under stress environments. Previously, the AMF have been mainly discussed as beneficial entities for nutrient uptake from soil; however, recently, it has been clearly depicted that plants inoculated with AMF can effectively combat various environmental cues, like salinity, drought, nutrient stress, alkali stress, cold stress, and extreme temperatures, and thus help increase per hectare yield of a large number of crops and vegetables. Encouragement of AMF usage is of immense importance for modern global agricultural systems for their consistent sustainability. Undoubtedly, exploitation of AMF for agricultural improvement can significantly reduce the use of synthetic fertilizers and other chemicals, thereby promoting the bio-healthy agriculture. AMF-mediated growth and productivity enhancement in crop plants can be beneficial to overcome the consumption requirement of increasing population across the globe. In addition, environment-friendly technologies shall be highly encouraged due to their widespread use. The primary focus of future research should be on the identification of genes and gene products controlling the AMF mediated growth and development regulation under stressful cues. Identification of both host as well as AMF specific protein factors regulating symbiotic association and the major cellular and metabolic pathways under different environmental stresses can be hot areas for future research in this field. Understanding the AMF induced modulations in the tolerance mechanisms and the crosstalk triggered to regulate plant performance can help improve crop productivity. Taken together, AMF must be explored at all levels to further investigate their role in nature as a bio-fertilizer for sustainable agricultural production.

Author Contributions

NB, CQ, MAA, SR, MIK, NA, and LZ contributed equally in preparation of this manuscript. MA helped considerably in writing of this manuscript and made final corrections.

Funding

This work was supported by the National Key Research and Development Program of China (2017YFE0114000), Sci-tec Project of China Tobacco Shaanxi Industrial Co. Ltd. (SXYC-2016-KJ-02) and Sci-tec Project of Shaanxi China Tobacco Industrial Co., Ltd. (JS-FW-2016-001).

Conflict of Interest Statement

All authors declare that there is no potential conflict of interest with any commercial or financial institution other than acknowledged in “Funding” section of this manuscript.

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