Evaluation of Plant Growth-Promoting and Salinity Ameliorating Potential of Halophilic Bacteria Isolated From Saline Soil

Kapadia, Chintan; Patel, Nafisa; Rana, Ankita; Vaidya, Harihar; Al‐Farraj, Saleh A.; Ansari, Mohammad Javed; Gafur, Abdul; Poczai, Péter; Sayyed, R. Z.

doi:10.3389/fpls.2022.946217

Cited by 30 publications

(16 citation statements)

References 82 publications

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“…In the present study, selected drought-tolerant bacteria produced acetic acid, citric acid, gluconic acid, and succinic acid during P solubilization in NBRIP medium as detected by HPLC ( Table 1 ). The production of organic acids is one of the key mechanisms involved in P solubilization ( Kapadia et al., 2022 ). Three most efficient drought-tolerant bacteria, i.e., Bacillus subtilis NM2, Brucella haematophila NM4, and Bacillus cereus NM-6, produced higher acetic acid, succinic acid, and gluconic acid ( Table 1 ).…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2023

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

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Section: Discussionmentioning

confidence: 99%

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

et al. 2023

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“…has been reported as the best phosphate solubilizers [ 86 ] by Sadeghi et al [ 87 ]; Jog et al [ 88 ]; and Sreevidya et al [ 89 ]. Plant growth-promoting bacteria help phosphorus solubilize, improve nutrient availability, control phytopathogens, produce phytohormones, biosynthesize metal chelators, and alleviate abiotic stress in plants [ 16 , 90 , 91 , 92 , 93 , 94 ]. These properties are considered an important practice for sustainable agriculture and good alternative practices to reduce environmental hazards with chemical fertilizers and pesticides.…”

Section: Discussionmentioning

confidence: 99%

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

Omar

Abdelmageed

Alturki

et al. 2022

Plants

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

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“…Several studies suggested that biofilm producing bacteria's are helpful in not only mitigation of abiotic stress but also prevent phytopathogen (Chandwani and Amaresan, 2022;Singh and Chauhan, 2022). They produce the exopolysacchrides which gives the adhesion potential and facilitates the plant microbial interaction (Kant, 2022;Kapadia et al, 2022). They play imperative role in neutralizing the abiotic stress and improving crop yield and quality (Admassie et al, 2022;Siddique et al, 2022) as shown in Figure 5.…”

Section: Discussionmentioning

confidence: 99%

Evaluating the adhesive potential of the newly isolated bacterial strains in research exploitation of plant microbial interaction

et al. 2022

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Bacterial adhesion potential constitutes the transition of bacteria from the planktonic to the static phase by promoting biofilm formation, which plays a significant role in plant-microbial interaction in the agriculture industry. In present study, the adhesion potential of five soil-borne bacterial strains belonging to different genera was studied. All bacterial strains were capable of forming colonies and biofilms of different levels of firmness on polystyrene. Significant variation was observed in hydrophobicity and motility assays. Among the five bacterial strains (SH-6, SH-8, SH-9, SH-10, and SH-19), SH-19 had a strong hydrophobic force, while SH-10 showed the most hydrophilic property. SH-6 showed great variability in motility; SH-8 had a swimming diffusion diameter of 70 mm, which was three times higher than that of SH-19. In the motility assay, SH-9 and SH-10 showed diffusion diameters of approximately 22 mm and 55 mm, respectively. Furthermore, among the five strains, four are predominately electron donors and one is electron acceptors. Overall, positive correlation was observed among Lewis acid base properties, hydrophobicity, and biofilm forming ability. However, no correlation of motility with bacterial adhesion could be found in present experimental work. Scanning electron microscopy images confirmed the adhesion potential and biofilm ability within extra polymeric substances. Research on the role of adhesion in biofilm formation of bacteria isolated from plants is potentially conducive for developing strategies such as plant–microbial interaction to mitigate the abiotic stress.

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Evaluation of Plant Growth-Promoting and Salinity Ameliorating Potential of Halophilic Bacteria Isolated From Saline Soil

Cited by 30 publications

References 82 publications

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

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

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

Evaluating the adhesive potential of the newly isolated bacterial strains in research exploitation of plant microbial interaction

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