Mining Saline Soils to Manifest Plant Stress-Alleviating Halophilic Bacteria

Nagaraju, Yalavarthi; Gundappagol, R. C.; Mahadevaswamy,

doi:10.1007/s00284-020-02028-w

Cited by 12 publications

(12 citation statements)

References 56 publications

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“…Several strains of Pseudomonas sp., Bacillus sp., and Acinetobacter sp. were reported to produce EPS, IAA, ACC deaminase, and solubilize insoluble minerals under different strains (Verma et al, 2018;Nagaraju et al, 2020). The precursor (L-tryptophan) concentration directly affects IAA produced (Nagaraju et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

The Role of Phyllosphere Bacteria in Improving Cotton Growth and Yield Under Drought Conditions

Sharath

Triveni

Nagaraju³

et al. 2021

Front. Agron.

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Cotton is a valuable fiber and cash crop in Telangana, India. This study examines how crop growth and fiber yield are affected by the uneven distribution of rainfall. Cotton phyllosphere bacterial isolates were gathered from the Rangareddy and Warangal Districts of Telangana, and in total, 31 phyllosphere bacterial isolates were obtained. These isolates were screened for drought tolerance and it was found that fifteen suitable isolates grew at −1.25 Mpa stress level with copious amounts of exopolysaccharides production. These isolates were further screened for ACC deaminase production and we observed 0.13–0.40 mM of α-ketobutyrate per milligram of cellular protein per hour. Five efficient bacterial isolates, namely Pseudomonas stutzeri, Acinetobacter sp., Bacillus mojavensis, Pseudomonas chlororaphis, and Enterobacter asburiae were found to produce ACC deaminase and were able to grow at −1.25 Mpa stress level. The cotton variety ADB-542 (drought susceptible) was treated with drought-tolerant five isolates. Acinetobacter sp. treated seeds had the highest seed germination and seedling vigor of 76.67 and 45.81%, respectively. The nutrient status of inoculated plots was considerably improved. The root length, fresh weight, proline content, and the number of bolls were increased by 28.52, 41.9, 28.78, and 12.99%, respectively, with the inoculation of Acinetobacter sp., to plants at −0.75 Mpa water potential. Overall the performance of cotton was improved significantly with the inoculation of phyllosphere bacteria to seeds; hence they can be recommended for the application of field crops as bio-inoculants.

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Section: Discussionmentioning

confidence: 99%

The Role of Phyllosphere Bacteria in Improving Cotton Growth and Yield Under Drought Conditions

Sharath

Triveni

Nagaraju³

et al. 2021

Front. Agron.

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“…Halophilic bacteria are well adapted to saline soils, but also bring about plant growth and solubilize macro and micronutrients in saline soils (Nagaraju et al 2020). The halophilic bacterial isolates in our study exhibited antifungal activity through the release of siderophores, chitinase enzyme production and HCN production.…”

Section: Discussionmentioning

confidence: 99%

Exploration of The Biocontrol Potential of Halophilic Bacteria Against Sclerotium Oryzae and Rhizoctonia Solani

Nagaraju

Swamy

Gundappagol

et al. 2021

Preprint

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There is a pressing need for biocontrol agents to control soil borne plant pathogens through biocontrol agents. The focus of this research was on the interactions of halophilic bacterial isolates with the phytopathogenic fungi such as Sclerotium oryzae and R. solanii. The biocontrol ability of fifty bacterial strains isolated from saline soils of the Koppal (Gangavathi) and Raichur districts was assessed in vitro. Eight isolates, HB-10, HB-17, HB-28, HB-30, HB-39, HB-48, HB-49 and HB-50 showed strong antifungal activity against S. oryzae and R. solani in dual culture method. These prospective isolates were identified as Bacillus cereus (HB-48 and HB-49), Bacillus albus (HB-17), Bacillus safensis (HB-28), Staphylococcus xylosus (HB-39), Lysinibacillus sphaericus (HB-50) and Pseudomonas stutzeri (HB-10 and HB-30) based on 16S rRNA analysis. We found a link between isolates producing HCN, siderophore and hydrolytic enzymes and the biocontrol function of isolates. The isolate B. albus (HB-17), produced both catechol and hydroximate type of siderophores, confirmed in Arnow’s and Csaky’s tests. All isolates were tested for drug resistance and were shown to be immune to penicillin, oflaxacin and vancomycin. In addition, these isolates were investigated at three NaCl concentrations (3, 6 and 10 % w/v) for their plant growth promoting attributes viz., phosphorous, and zinc solubilization and potassium release. The solubilization zones of zinc carbonate, zinc oxide and phosphorous were within the range of 5.20 to 9.0 mm, 6.06 to 13.20 mm, 6.30 to 9.70 mm respectively, at 6 % NaCl concentration.

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“…It has been reported that some AST-PGPB are even more active under harsh environmental conditions [52,84]. Nagaraju et al demonstrated that the solubilization of zinc compounds decreases significantly with increasing salinity [139]. In addition, selected AST-PGPB may not exhibit PGPB properties or promote plant growth under standard conditions.…”

Section: Abiotic Stress Tolerant Pgpbmentioning

confidence: 99%

“…Ashfaq et al have reported about halotolerant rhizobacteria, which may improve potassium availability under salinity stress [ 112 ]. Twenty-nine isolates out of 50 halophilic rhizobacteria were able to solubilize zinc carbonate and zinc oxide, under 3% NaCl concentration, while 10 isolates solubilized zinc carbonate under 10% concentration of NaCl [ 139 ]. It has also been reported that selected salt-tolerant PGPB may also increase iron, copper, zinc, manganese content due to their activity [ 13 , 125 , 166 , 167 ].…”

Section: Pgpb and Its Role In Inducing Different Abiotic Stress Tolerance In Plantsmentioning

confidence: 99%

The Contrivance of Plant Growth Promoting Microbes to Mitigate Climate Change Impact in Agriculture

2021

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Combating the consequences of climate change is extremely important and critical in the context of feeding the world’s population. Crop simulation models have been extensively studied recently to investigate the impact of climate change on agricultural productivity and food security. Drought and salinity are major environmental stresses that cause changes in the physiological, biochemical, and molecular processes in plants, resulting in significant crop productivity losses. Excessive use of chemicals has become a severe threat to human health and the environment. The use of beneficial microorganisms is an environmentally friendly method of increasing crop yield under environmental stress conditions. These microbes enhance plant growth through various mechanisms such as production of hormones, ACC deaminase, VOCs and EPS, and modulate hormone synthesis and other metabolites in plants. This review aims to decipher the effect of plant growth promoting bacteria (PGPB) on plant health under abiotic soil stresses associated with global climate change (viz., drought and salinity). The application of stress-resistant PGPB may not only help in the combating the effects of abiotic stressors, but also lead to mitigation of climate change. More thorough molecular level studies are needed in the future to assess their cumulative influence on plant development.

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Mining Saline Soils to Manifest Plant Stress-Alleviating Halophilic Bacteria

Cited by 12 publications

References 56 publications

The Role of Phyllosphere Bacteria in Improving Cotton Growth and Yield Under Drought Conditions

The Role of Phyllosphere Bacteria in Improving Cotton Growth and Yield Under Drought Conditions

Exploration of The Biocontrol Potential of Halophilic Bacteria Against Sclerotium Oryzae and Rhizoctonia Solani

The Contrivance of Plant Growth Promoting Microbes to Mitigate Climate Change Impact in Agriculture

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