Recent advances in PGPR-mediated resilience toward interactive effects of drought and salt stress in plants

Frontiers in Microbiology, Год журнала: 2023, Номер 14

Опубликована: Сен. 27, 2023

The present crisis at hand revolves around the need to enhance plant resilience various environmental stresses, including abiotic and biotic ensure sustainable agriculture mitigate impact of climate change on crop production. One such promising approach is utilization growth-promoting rhizobacteria (PGPR) mediate these stresses. Plants are constantly exposed stress factors, as drought, salinity, pathogens, nutrient deficiencies, which can significantly reduce yield quality. PGPR beneficial microbes that reside in rhizosphere plants have been shown positively influence growth tolerance through mechanisms, solubilization, phytohormone production, induction systemic resistance. review comprehensively examines mechanisms promotes resilience, acquisition, hormonal regulation, defense induction, focusing recent research findings. advancements made field PGPR-mediated multi-omics approaches ( viz. , genomics, transcriptomics, proteomics, metabolomics) unravel intricate interactions between discussed their molecular pathways involved tolerance. Besides, also emphasizes importance continued implementation PGPR-based strategies address pressing challenges facing global food security commercialization bio-formulations for agricultural.

Язык: Английский

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The PGPR Mechanisms of Salt Stress Adaptation and Plant Growth Promotion

Agronomy, Год журнала: 2022, Номер 12(10), С. 2266 - 2266

Опубликована: Сен. 22, 2022

Worldwide crop productivity hampers severely due to the adverse effects of salinity. Global warming causes a rapid escalation salt-affected area, and new agricultural land is affected through saltwater intrusion. The ever-growing human population impulses utilize saline area for cultivation ensure food security. Salinity resistance crops could be promising substitute but with minor success because inappropriate tactics on soil management resulted in unsatisfactory yield. Salt-tolerant plant growth-promoting rhizobacteria (ST-PGPR) considered an alternate way towards enhancing growth ecosystems. It reported that PGPR enabled produce exopolysaccharides which lead biofilm formation generate osmoprotectants antioxidant enzymes can significantly contribute stimulating ecosystem. In addition, several characteristics such as acquisition essential nutrients upsurge hormone production enhance simultaneously. this review, we will explore survival mechanisms ST-PGPR their influence promotion

Язык: Английский

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Bacterial volatile organic compounds (VOCs) promote growth and induce metabolic changes in rice

Frontiers in Plant Science, Год журнала: 2023, Номер 13

Опубликована: Фев. 9, 2023

Plant growth-promoting bacteria (PGPB) represent an eco-friendly alternative to reduce the use of chemical products while increasing productivity economically important crops. The emission small gaseous signaling molecules from PGPB named volatile organic compounds (VOCs) has emerged as a promising biotechnological tool promote biomass accumulation in model plants (especially Arabidopsis thaliana) and few crops, such tomato, lettuce, cucumber. Rice (Oryza sativa) is most essential food crop for more than half world's population. However, VOCs improve this performance not yet been investigated. Here, we evaluated composition effects bacterial on growth metabolism rice. First, selected isolates (IAT P4F9 E.1b) that increased rice dry shoot by up 83% co-cultivation assays performed with different durations time (7 12 days). Metabolic profiles co-cultivated these controls (without non-promoter bacteria-1003-S-C1) were investigated via1H nuclear magnetic resonance. analysis identified metabolites (e.g., amino acids, sugars, others) differential abundance between treatments might play role metabolic pathways, protein synthesis, signaling, photosynthesis, energy metabolism, nitrogen assimilation, involved promotion. Interestingly, IAT displayed consistent promotion activity also able increase vivo. Molecular identification sequencing 16S rRNA gene E.1b showed higher identity Serratia Achromobacter species, respectively. Lastly, volatilomes two other (1003-S-C1 Escherichia coli DH5α) through headspace solid-phase microextraction coupled gas chromatography-mass spectrometry. Compounds belonging classes, benzenoids, ketones, alcohols, sulfide, alkanes, pyrazines, identified. One VOCs, nonan-2-one, was validated vitro bioactive compound capable promoting growth. Although further analyses are necessary properly elucidate molecular mechanisms, our results suggest potential candidates sources bioproducts, contributing sustainable agriculture.

Язык: Английский

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Mitigation of water scarcity with sustained growth of Rice by plant growth promoting bacteria

Frontiers in Plant Science, Год журнала: 2023, Номер 14

Опубликована: Янв. 23, 2023

Climate change augments the risk to food security by inducing drought stress and a drastic decline in global rice production. Plant growth-promoting bacteria (PGPB) have been known improve plant growth under stress. Here present study, we isolated, identified, well-characterized eight drought-tolerant from rhizosphere that are tolerant 20% PEG-8000. These strains exhibited multiple traits, i.e., 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, exopolysaccharide production, phosphate (P)-solubilizing activity (51–356 µg ml -1 ), indole-3 acetic (IAA) production (14.3–46.2 of organic acids (72–178 ). Inoculation bacterial consortium ( Bacillus subtilis NM-2, Brucella haematophilum NM-4, cereus NM-6) significantly improved seedling vigor index (1009.2-1100) as compared non-inoculated stressed plants (630-957). Through rhizoscanning, efficiency was validated root parameters such length (17%), diameter, surface area (18%) all tested genotypes with respective treatments. Furthermore, response inoculation on three positively correlated ameliorating traits accumulation osmoprotectant, proline (85.8%–122%), relative water content (51%), membrane stability (64%), antioxidant enzymes reduce oxidative damage reactive oxygen species. A decrease temperature chlorophyll inoculated were found using infrared thermal imaging soil analyzer development (SPAD), respectively. The key supporting role toward responses robust techniques like an gas analyzer. principal component analysis depicts contribution yield integration genotype (NIBGE-DT02) potential strains, NM-6, can serve effective bioinoculant cope scarcity current alarming issues related fluctuating climate.

Язык: Английский

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PGPR-Mediated Breakthroughs in Plant Stress Tolerance for Sustainable Farming

Journal of Plant Growth Regulation, Год журнала: 2023, Номер 43(9), С. 2955 - 2971

Опубликована: Май 1, 2023

Язык: Английский

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Isolation and characterization of halotolerant plant growth promoting rhizobacteria from mangrove region of Sundarbans, India for enhanced crop productivity

Frontiers in Plant Science, Год журнала: 2023, Номер 14

Опубликована: Апрель 20, 2023

Halotolerant plant growth promoting rhizobacteria (PGPR) are beneficial microorganisms utilized to mitigate the biotic and abiotic stresses in plants. The areas of Sundarban mangroves West Bengal, India have been reported be rich halotolerant microflora, yet major area remains unexplored. present study, therefore, aims map down region-specific native microbial community potent salt tolerance, (PGP) activity antagonistic against fungal pathogens. Bacterial samples were isolated from saline soil mangroves. A total 156 bacterial 20 screened for their tolerance potential. These isolates characterised using morphological, biochemical, molecular approaches. Based on 16s rRNA sequencing, they classified into 4 different genera, including Arthrobacter sp. (01 isolate), Pseudomonas plecoglossicida Kocuria rosea Bacillus (17 isolates). which possessed traits phosphate, zinc solubilization, indole acetic acid production, siderophore, ammonia generation selected. Further, effect two GN-5 JR-12 showed most prominent PGP activities was evaluated pea under high salinity conditions. improved survival by germination (36 43%) root-shoot weight comparison non-inoculated control In a subsequent dual culture confrontation experiment, both these halo-tolerant aggressive root rot disease-causing Macrophomina phaseolina (Tassi) Goid NAIMCC-F-02902. identified could used as potential bioagents soils, with disease. However, further studies at physiological level would help delineate detail mechanistic understanding broad-spectrum defence pathogen.

Язык: Английский

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Harnessing plant growth-promoting rhizobacteria, Bacillus subtilis and B. aryabhattai to combat salt stress in rice: a study on the regulation of antioxidant defense, ion homeostasis, and photosynthetic parameters

Frontiers in Plant Science, Год журнала: 2024, Номер 15

Опубликована: Июнь 13, 2024

Introduction The ongoing global expansion of salt-affected land is a significant factor, limiting the growth and yield crops, particularly rice ( Oryza sativa L). This experiment explores mitigation salt-induced damage in (cv BRRI dhan100) following application plant growth-promoting rhizobacteria (PGPR). Methods Rice seedlings, at five- six-weeks post-transplanting, were subjected to salt stress treatments using 50 100 mM NaCl seven-day intervals. Bacterial cultures consisting endophytic PGPR Bacillus subtilis B. aryabhattai ) an epiphytic administered three critical stages: transplantation 42-day-old vegetative stage five weeks post-transplantation, panicle initiation seven post-transplantation. Results Salt induced osmotic stress, ionic imbalances, oxidative plants, with consequent negative effects on growth, decrease photosynthetic efficiency, changes hormonal regulation, along increased methylglyoxal (MG) toxicity. treatment alleviated salinity by improving antioxidant defenses, restoring equilibrium, enhancing water balance, increasing nutrient uptake, attributes, bolstering hormone synthesis, MG detoxification. Discussion These findings highlight potential bolster physiological biochemical functionality serving as effective buffer against stress–induced damage. showed greatest benefits, while both had commendable mitigating plants.

Язык: Английский

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Harnessing abiotic elicitors to bolster plant's resistance against bacterial pathogens

Plant Stress, Год журнала: 2024, Номер 11, С. 100371 - 100371

Опубликована: Янв. 24, 2024

Bacterial pathogens have been of considerable interest in the field plant pathology as they are known to cause serious constraints crop production once infected. When environmental conditions favor disease development, well-known bacterial including Pseudomonas syringae, Ralstonia spp., and Xanthomonas spp. exert severe harmful impacts across a variety plants. The infect tissues' extracellular spaces release virulence factors directly into cytosol or apoplast host plant. In this context, developing long-lasting effective methods for controlling infections becomes essential maintaining sustainable agricultural production. However, conventional such copper-based bactericides antibiotics often proven be ineffective also adversely affect human health environment. Therefore, immense challenges offered by diseases global agriculture encouraged environment-friendly alternatives chemical pesticides. Abiotic elicitors chemicals with non-biological origins that activate defense mechanisms can potentially help protection. Numerous abiotic shown impressive effectiveness boosting defenses against infections, employing multiple induced resistance various crops. present review explores rapidly discusses their role strengthening through induction resistance, understanding immunity, highlighting both potential benefits current strengthen food security.

Язык: Английский

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Exploring the Plant Growth-Promotion of Four Streptomyces Strains from Rhizosphere Soil to Enhance Cucumber Growth and Yield

Plants, Год журнала: 2022, Номер 11(23), С. 3316 - 3316

Опубликована: Дек. 1, 2022

The genus Streptomyces is the most abundant and essential microbes in soil microbial community. are familiar have great potential to produce a large variety of bioactive compounds. This considers an efficient biofertilizer based on its plant growth-promoting activities. Based their ability wide varieties molecules, present study aimed explore growth promotion four strains role enhancing cucumber yield under greenhouse conditions. sp. strain HM2, thinghirensis HM3, HM8, tricolor HM10 were chosen for current study. Plant (PGP) features, i.e., indole acetic acid (IAA) production, siderophore excretion, solubilizing phosphate, evaluated vitro. All produced IAA, siderophore, immobilized inorganic phosphate. Following 4 days incubation at 30 °C, copious amounts IAA (18, 22, 62, 146 µg/mL, respectively) siderophores (42.59, 40.01, 16.84, 64.14% SU, respectively). At same time, P solubilization efficacy scored 64.3%, 84.4%, 57.2%, 81.6% with frequency. During planta evaluation, selected combined rock phosphate assessed as biofertilizers plants. Under all treatments, positive significant differences studied traits manifested except dry stem matter (SDM), net assimilation rate (NAR), relative (RGR), fruit firmness (FF). Treatment T4 (rock + HM3) followed by T5 HM8) revealed best results height (PH), number leaves per (NLPP), root length (RL), fruits (NFPP), (FL), diameter (FD), fresh weight (FFWPP), (SP) after 21 DAT, end experiment. Notably, T6 HM10) caused considerable increase leaf area (LA). bacteria enhance through phosphorus solubilizing, improve nutrient availability, phytohormones, support abiotic stress. These features important sustainable agriculture reducing environmental pollution chemical fertilizers pesticides.

Язык: Английский

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Co-application of Mycorrhiza and methyl jasmonate regulates morpho-physiological and antioxidant responses of Crocus sativus (Saffron) under salinity stress conditions

Scientific Reports, Год журнала: 2023, Номер 13(1)

Опубликована: Май 6, 2023

Salinity stress is the second most devastating abiotic factor limiting plant growth and yields. Climate changes have significantly increased salinity levels of soil. Besides improving physiological responses under conditions, jasmonates modulate Mycorrhiza-Plant relationships. The present study aimed to evaluate effects methyl jasmonate (MeJ) Funneliformis mosseae (Arbuscular mycorrhizal (AM) on morphology antioxidant mechanisms in Crocus sativus L. stress. After inoculation with AM, pre-treated C. corms MeJ were grown low, moderate, severe Intense damaged corm, root, total leaf dry weight, area. Salinities up 50 mM Proline content Polyphenol oxidase (PPO) activity, but this trend proline. Generally, anthocyanins, soluble sugars, PPO. Total chlorophyll superoxide dismutase (SOD) activity by salinity. maximum catalase SOD activities + AM 125 mM, respectively, -MeJ treatment was 75 mM. Although 20 growth, using mycorrhiza enhanced trend. Moreover, these treatments reduced damage 100 Using can improve saffron various ranges levels; however, like 120 phytohormone F. could be adverse.

Язык: Английский

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