Current Advances in Plant Growth Promoting Bacteria Alleviating Salt Stress for Sustainable Agriculture

Mokrani, Slimane; Nabti, El-hafid; Cruz, Cristina

doi:10.3390/app10207025

Cited by 67 publications

(35 citation statements)

References 242 publications

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“…Besides the effect of PSB on root architecture and exudation in hydroponics, these bacteria sustained the plant growth under P stress as indicated by a significant increase in plant antioxidant enzyme (SOD, POD, MDA, and CAT) activity with a concomitant decrease in MDA and H 2 O 2 contents (Figure 7). There is increasing evidence that PGPR confers tolerance in plants to various abiotic stresses (Mokrani et al, 2020;Bhat et al, 2020;Khan et al, 2020;Camaille et al, 2021) by activating enzymes like CAT, POD, and SOD activity which act as primary reactive oxygen species (ROS) scavengers (Grover et al, 2021). These enzymes catalyze the O 2− to H 2 O 2 , and H 2 O 2 is further converted into H 2 O and O 2 by peroxidases, thereby enhancing tolerance and eliciting resistance in plants against oxidative stress (Li et al, 2020;Eljebbawi et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Differential Root Exudation and Architecture for Improved Growth of Wheat Mediated by Phosphate Solubilizing Bacteria

et al. 2021

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Phosphorous (P) deficiency is a major challenge faced by global agriculture. Phosphate-solubilizing bacteria (PSB) provide a sustainable approach to supply available phosphates to plants with improved crop productivity through synergistic interaction with plant roots. The present study demonstrates an insight into this synergistic P-solubilizing mechanism of PSB isolated from rhizosphere soils of major wheat-growing agro-ecological zones of Pakistan. Seven isolates were the efficient P solubilizers based on in vitro P-solubilizing activity (233-365 μg ml–1) with a concomitant decrease in pH (up to 3.5) by the production of organic acids, predominantly acetic acid (∼182 μg ml–1) and gluconic acid (∼117 μg ml–1). Amplification and phylogenetic analysis of gcd, pqqE, and phy genes of Enterobacter sp. ZW32, Ochrobactrum sp. SSR, and Pantoea sp. S1 showed the potential of these PSB to release orthophosphate from recalcitrant forms of phosphorus. Principal component analysis indicates the inoculation response of PSB consortia on the differential composition of root exudation (amino acids, sugars, and organic acids) with subsequently modified root architecture of three wheat varieties grown hydroponically. Rhizoscanning showed a significant increase in root parameters, i.e., root tips, diameter, and surface area of PSB-inoculated plants as compared to uninoculated controls. Efficiency of PSB consortia was validated by significant increase in plant P and oxidative stress management under P-deficient conditions. Reactive oxygen species (ROS)-induced oxidative damages mainly indicated by elevated levels of malondialdehyde (MDA) and H2O2 contents were significantly reduced in inoculated plants by the production of antioxidant enzymes, i.e., superoxide dismutase, catalase, and peroxidase. Furthermore, the inoculation response of these PSB on respective wheat varieties grown in native soils under greenhouse conditions was positively correlated with improved plant growth and soil P contents. Additionally, grain yield (8%) and seed P (14%) were significantly increased in inoculated wheat plants with 20% reduced application of diammonium phosphate (DAP) fertilizer under net house conditions. Thus, PSB capable of such synergistic strategies can confer P biofortification in wheat by modulating root morphophysiology and root exudation and can alleviate oxidative stress under P deficit conditions.

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Section: Discussionmentioning

confidence: 99%

Differential Root Exudation and Architecture for Improved Growth of Wheat Mediated by Phosphate Solubilizing Bacteria

et al. 2021

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“…This study further demonstrates that the makeup of the microbial community altered with salinity, where certain microbial OTUs from the non-saline source soil, which was employed as the original substrate, were filtered out or became less numerous as salinity increased [159]. It is presumed that salinity lowers the biomass of microbes as well as their activity and community structure due to their large area volume ratio, high permeability of cell membrane and rapid turnover rate, mostly due to osmotic pressure causing cells to shrink resulting in water efflux from the microbial cells and therefore retarding their growth [160,161]. When it comes to salt stress, fungi are more vulnerable than bacteria [108,162,163], hence in saline soils, the bacterium/fungi ratio might be raised.…”

Section: Salinitymentioning

confidence: 99%

Effects of Abiotic Stress on Soil Microbiome

Rahman

Hamid

Nadarajah

2021

IJMS

117

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Rhizospheric organisms have a unique manner of existence since many factors can influence the shape of the microbiome. As we all know, harnessing the interaction between soil microbes and plants is critical for sustainable agriculture and ecosystems. We can achieve sustainable agricultural practice by incorporating plant-microbiome interaction as a positive technology. The contribution of this interaction has piqued the interest of experts, who plan to do more research using beneficial microorganism in order to accomplish this vision. Plants engage in a wide range of interrelationship with soil microorganism, spanning the entire spectrum of ecological potential which can be mutualistic, commensal, neutral, exploitative, or competitive. Mutualistic microorganism found in plant-associated microbial communities assist their host in a number of ways. Many studies have demonstrated that the soil microbiome may provide significant advantages to the host plant. However, various soil conditions (pH, temperature, oxygen, physics-chemistry and moisture), soil environments (drought, submergence, metal toxicity and salinity), plant types/genotype, and agricultural practices may result in distinct microbial composition and characteristics, as well as its mechanism to promote plant development and defence against all these stressors. In this paper, we provide an in-depth overview of how the above factors are able to affect the soil microbial structure and communities and change above and below ground interactions. Future prospects will also be discussed.

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“…PGPR may act via diverse processes, including the regulation of the transcription of various genes, cellular communication through quorum sensing and by regulating the production of various secondary metabolites (Bakka & Challabathula, 2020). According to Mokrani et al (2020), PGPR can mitigate the harmful effects of salinity stress and restore crop production by maintaining the osmotic balance, ion homeostasis, and turgor pressure of the plant body as well as sustain the soil health in salt‐infested soils. Numan et al (2018) have highlighted the role of halotolerant PGPR and their usage as a cost‐effective strategy for the induction of salinity tolerance and growth promotion in plants.…”

Section: Salt‐tolerant Microorganisms: Supporting Plant Performance Under Salinity Stressmentioning

confidence: 99%

Understanding the potential of root microbiome influencing salt‐tolerance in plants and mechanisms involved at the transcriptional and translational level

Roy

Chakraborty

Chakraborty³

2021

Physiologia Plantarum

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Soil salinity severely affects plant growth and development and imparts inevitable losses to crop productivity. Increasing the concentration of salts in the vicinity of plant roots has severe consequences at the morphological, biochemical, and molecular levels. These include loss of chlorophyll, decrease in photosynthetic rate, reduction in cell division, ROS generation, inactivation of antioxidative enzymes, alterations in phytohormone biosynthesis and signaling, and so forth. The association of microorganisms, viz. plant growth‐promoting rhizobacteria, endophytes, and mycorrhiza, with plant roots constituting the root microbiome can confer a greater degree of salinity tolerance in addition to their inherent ability to promote growth and induce defense mechanisms. The mechanisms involved in induced stress tolerance bestowed by these microorganisms involve the modulation of phytohormone biosynthesis and signaling pathways (including indole acetic acid, gibberellic acid, brassinosteroids, abscisic acid, and jasmonic acid), accumulation of osmoprotectants (proline, glycine betaine, and sugar alcohols), and regulation of ion transporters (SOS1, NHX, HKT1). Apart from this, salt‐tolerant microorganisms are known to induce the expression of salt‐responsive genes via the action of several transcription factors, as well as by posttranscriptional and posttranslational modifications. Moreover, the potential of these salt‐tolerant microflora can be employed for sustainably improving crop performance in saline environments. Therefore, this review will briefly focus on the key responses of plants under salinity stress and elucidate the mechanisms employed by the salt‐tolerant microorganisms in improving plant tolerance under saline environments.

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Current Advances in Plant Growth Promoting Bacteria Alleviating Salt Stress for Sustainable Agriculture

Cited by 67 publications

References 242 publications

Differential Root Exudation and Architecture for Improved Growth of Wheat Mediated by Phosphate Solubilizing Bacteria

Differential Root Exudation and Architecture for Improved Growth of Wheat Mediated by Phosphate Solubilizing Bacteria

Effects of Abiotic Stress on Soil Microbiome

Understanding the potential of root microbiome influencing salt‐tolerance in plants and mechanisms involved at the transcriptional and translational level

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