Application of Plant Growth Promoting Rhizobacteria (PGPR) in Crop Productivity Improvement and Sustainable Agriculture

Gontia‐Mishra, Iti; Sapre, Swapnil; Sikdar, Sumana; Tiwari, Sharad

doi:10.1007/978-981-16-2339-4_27

Cited by 5 publications

(4 citation statements)

References 140 publications

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“…There is a lot of information that IAA-producing microorganisms play a significant role in enhancing plant growth under stress conditions. They participate in the regulation of stress-associated genes [99], initiate auxin-sensitive gene signaling in plants [100], activate antioxidant enzymes, promote the synthesis of osmoprotectors, and enhance the accumulation of photosynthetic pigments [41,94,97]. These mechanisms collectively contribute to improved plant resilience and performance under stress.…”

Section: Discussionmentioning

confidence: 99%

The Contribution of Hormonal Changes to the Protective Effect of Endophytic Bacterium Bacillus subtilis on Two Wheat Genotypes with Contrasting Drought Sensitivities under Osmotic Stress

Lastochkina,

Yuldashev,

Avalbaev

et al. 2023

Microorganisms

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A comparative analysis was conducted to evaluate the effects of seed priming with endophytic bacterium Bacillus subtilis 10-4 (BS) on the hormonal system and cell wall tolerance (lipid peroxidation (LPO), electrolyte leakage (EL), and root lignin deposition) of two Triticum aestivum L. (wheat) varieties with contrasting drought sensitivities (Ekada 70—drought-tolerant (DT); Salavat Yulaev—drought-sensitive (DS)) under normal conditions and 12% polyethylene glycol-6000 (PEG)-induced osmotic stress. The results showed that under normal conditions, the growth stimulation in wheat plants by BS was attributed to changes in the hormonal balance, particularly an increase in endogenous indole-3-acetic acid (IAA) accumulation. However, under stress, a significant hormonal imbalance was observed in wheat seedlings, characterized by a pronounced accumulation of abscisic acid (ABA) and a decrease in the levels of IAA and cytokinins (CK). These effects were reflected in the inhibition of plant growth. BS exhibited a protective effect on stressed plants, as evidenced by a significantly lower amplitude of stress-induced changes in the hormonal system: maintaining the content of IAA at a level close to the control, reducing stress-induced ABA accumulation, and preventing CK depletion. These effects were further reflected in the normalization of growth parameters in dehydrated seedlings, as well as a decrease in leaf chlorophyll degradation, LPO, and EL, along with an increase in lignin deposition in the basal part of the roots in both genotypes. Overall, the findings demonstrate that BS, producing phytohormones, specifically IAA and ABA, had a more pronounced protective effect on DT plants, as evidenced by a smaller amplitude of stress-induced hormonal changes, higher leaf chlorophyll content, root lignin deposition, and lower cell membrane damage (LPO) and permeability (EL) compared to DS plants.

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Section: Discussionmentioning

confidence: 99%

The Contribution of Hormonal Changes to the Protective Effect of Endophytic Bacterium Bacillus subtilis on Two Wheat Genotypes with Contrasting Drought Sensitivities under Osmotic Stress

Lastochkina,

Yuldashev,

Avalbaev

et al. 2023

Microorganisms

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“…Over the past few decades, microorganisms have become an integral part of sustainable agriculture practices worldwide [1]. The application of plant growth-promoting rhizobacteria (PGPR) has steadily gained attention in agriculture, providing the sustainable alternative to pesticides, supplements, and chemical fertilizers required for the growth of economically important crops such as potato [2]. Potato (Solanum tuberosum L.) ranks as the third most economically important vegetable crop globally, after wheat and rice.…”

Section: Introductionmentioning

confidence: 99%

In silico identification and characterization of nifH protein of Azospirillum strains isolated from Solanum tuberosum L.

Naqqash,

Zahra,

Bilal Hussain

et al. 2023

PJBB

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Nitrogen (N) constitutes as a fundamental macronutrient necessary for maintaining plant health, metabolism, and overall survival. However, it exists in the soil in insoluble compound forms that plants cannot directly uptake. Biological N-fixation (BNF) is a fundamental process wherein atmospheric N2 is reduced to form biologically available ammonium, providing a key N source for plants. The process of BNF is carried out by a diverse yet limited group of microorganisms termed diazotrophs, using the nitrogenase enzyme. This enzyme complex includes two proteins: di-nitrogenase reductase iron protein (nifH), and di-nitrogenase molybdenum iron protein. Due to its significant conservation, the nifH gene serves as a valuable molecular marker for assessing the potential of N-fixation in various microorganisms. Therefore, the current study focused on a comprehensive computational exploration nifH gene and protein of Azospirillum strains (TN03 and TN22). This analysis includes the evaluation of their physicochemical traits, phylogenetic analysis, structural properties (including 3D models), quality assessment of models, and functional annotation analysis using various established bioinformatics tools. The protein of both strains showed an average molecular weight of approximately 14959 and 15313 Da, respectively, exhibited thermal stability and an acidic profile. Furthermore, this theoretical insight could aid researchers in understanding the structure of predicted protein and might facilitate the designing of genetically modified N-fixing bacteria through the design of specific primers.

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“…The reason that cells require an increase in flagellar density is unknown, but it may be necessary to increase the total amount of thrust generated by the cell [34,35]. Moreover, biofilm formation and EPS production by PGPR are processes that help microorganisms endure adverse environments [36]. In saline environments, in particular, the high osmotic pressure usually causes cytoplasmic lysis and cell death.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Differential Impact of Salt Stress on Root Colonization Adaptation Mechanisms in Plant Growth-Promoting Rhizobacteria

Cappellari,

Bogino,

Nievas

et al. 2023

Plants

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Salinity inhibits plant growth by affecting physiological processes, but soil microorganisms like plant growth-promoting rhizobacteria (PGPR) can alleviate abiotic stress and enhance crop productivity. However, it should be noted that rhizobacteria employ different approaches to deal with salt stress conditions and successfully colonize roots. The objective of this study was to investigate the effect of salt stress on bacterial survival mechanisms such as mobility, biofilm formation, and the autoaggregation capacity of three plant growth-promoting strains: Pseudomonas putida SJ04, Pseudomonas simiae WCS417r, and Bacillus amyloliquefaciens GB03. These strains were grown in diluted LB medium supplemented with 0, 100, 200, or 300 mM NaCl. Swimming and swarming mobility were evaluated in media supplemented with 0.3 and 0.5% agar, respectively. Biofilm formation capacity was quantified using the crystal violet method, and the autoaggregation capacity was measured spectrophotometrically. In addition, we evaluated in vitro the capacity of the strains to ameliorate the effects of saline stress in Mentha piperita. The study found that the GB03 strain exhibited enhanced swarming mobility when the salt concentration in the medium increased, resulting in a two-fold increase in the halo diameter at 300 mM. However, high concentrations of NaCl did not affect the swimming mobility. In contrast, swimming motility was reduced in WCS417r and SJ04 under salt stress. On the other hand, exposure to 300 mM NaCl resulted in a 180% increase in biofilm formation and a 30% rise in the percentage of autoaggregation in WCS417r. Conversely, the autoaggregation percentage of the strains SJ04 and GB03 remained unaffected by saline stress. However, for GB03, biofilm formation decreased by 80% at 300 mM. Simultaneously, inoculation with the three evaluated strains alleviated the detrimental effects of salinity on plant growth. Under 150 mM salt stress, all strains showed increased fresh weight, with GB03 and WCS417r improving by 40% and SJ04 exhibiting the most remarkable effect with a 70% rise compared to non-inoculated plants. Despite their different strategies for mitigating salt stress, the application of these strains presents a promising strategy for effectively mitigating the negative consequences of salt stress on plant cultivation.

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Application of Plant Growth Promoting Rhizobacteria (PGPR) in Crop Productivity Improvement and Sustainable Agriculture

Cited by 5 publications

References 140 publications

The Contribution of Hormonal Changes to the Protective Effect of Endophytic Bacterium Bacillus subtilis on Two Wheat Genotypes with Contrasting Drought Sensitivities under Osmotic Stress

The Contribution of Hormonal Changes to the Protective Effect of Endophytic Bacterium Bacillus subtilis on Two Wheat Genotypes with Contrasting Drought Sensitivities under Osmotic Stress

In silico identification and characterization of nifH protein of Azospirillum strains isolated from Solanum tuberosum L.

Exploring the Differential Impact of Salt Stress on Root Colonization Adaptation Mechanisms in Plant Growth-Promoting Rhizobacteria

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