Microbe-mediated alleviation of drought stress and acquisition of phosphorus in great millet (Sorghum bicolour L.) by drought-adaptive and phosphorus-solubilizing microbes

Kour, Divjot; Rana, Kusam Lata; Kaur, Tanvir; Sheikh, Imran; Yadav, Ajar Nath; Kumar, Vinod; Dhaliwal, H. S.; Saxena, Anil Kumar

doi:10.1016/j.bcab.2020.101501

Cited by 132 publications

(28 citation statements)

References 60 publications

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“…Our PSB and KSB isolates identified as Acinetobacter pittii , Pseudomonas alcaligenes , Acinetobacter calcoaceticus , Acinetobacter sp., and Acinetobacter oleivorans. Although bacteria belonging to Pseudomonas have been already reported to include PSB and KSB as well as Acinetobacter which is known as PSB [ 27 – 29 ], to our knowledge, this is the first report on K solubilization potential of genera Acinetobacter .…”

Section: Discussionmentioning

confidence: 99%

Isolation of Bacteria with Potential Plant-Promoting Traits and Optimization of Their Growth Conditions

et al. 2020

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This research aimed at investigating the isolation and identification of bacterial strains with biological nitrogen-fixing capability and phosphate, potassium, and zinc solubilization activities from a durum wheat field under two different tillage practices including 10 years of conventional tillage (CT) and no-tillage (NT) practices. Attempts were also extended to estimate their relative abundances in the soil as well as to develop accurate mathematical models in determining the effect of different temperatures, NaCl concentrations and pH on the growth, and activity of selected isolates. Twelve effective bacterial strains, including Pseudomonas, Acinetobacter, and Comamonas genera, were identified with a great potential to solubilize the insoluble forms of phosphate (from 11.1 to 115.5 mg l−1 at pH 8), potassium (from 32.2 to 35.6 mg l−1 at pH 7), and zinc (from 1.11 to 389.90 mg l−1 at pH 9) as well as to fix N2 gas (from 19.9 to 25.2 mg l−1). To our knowledge, this is the first report of the ability of Comamonas testosteroni and Acinetobacter pittii to fix nitrogen and to solubilize insoluble potassium compound, respectively. Three families, Moraxellaceae, Pseudomonadaceae, and Comamonadaceae, showed a higher percentage of abundance in the NT samples as compared to the CT, but only significant difference was observed in the relative abundance of Pseudomonadaceae (P < 0.01). These strains could be definitively recommended as inoculants to promote plant growth in the wide ranges of pH, salinity levels (with maximum growth and complete inhibition of growth from 0.67–0.92% to 3.5–9.3% NaCl, respectively), and temperatures (2.1–45.1 °C).

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Section: Discussionmentioning

confidence: 99%

Isolation of Bacteria with Potential Plant-Promoting Traits and Optimization of Their Growth Conditions

et al. 2020

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“…This role led to improved soil features and plant growth characters through organic acids which are secreted from these bacteria to facilitate a release of the bound forms of phosphates from calcareous soils by decreasing the pH in the rhizosphere. PGPB are environmentally friendly biofertilizers which not only increase and solubilize free phosphate and increase the fixation of biological nitrogen but also increase Fe and Zn availability in the rhizosphere as well as decrease the necessity of application of chemical fertilizers [152]. The phosphate solubilization process depends on C-P lyase, nonspecific phosphatases, and phytases, enzymes that act through the formation of organic acids such as oxalate, acetate, succinate, glycolate and citrate [153].…”

Section: The Role Of Plant Growth-promoting Bacteria As Biofertilizersmentioning

confidence: 99%

The Role of Plant Growth-Promoting Bacteria in Alleviating the Adverse Effects of Drought on Plants

Abdelaal

AlKahtani

Attia

et al. 2021

Biology

121

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Plant growth-promoting bacteria play an essential role in enhancing the physical, chemical and biological characters of soils by facilitating nutrient uptake and water flow, especially under abiotic stress conditions, which are major constrains to agricultural development and production. Drought is one of the most harmful abiotic stress and perhaps the most severe problem facing agricultural sustainability, leading to a severe shortage in crop productivity. Drought affects plant growth by causing hormonal and membrane stability perturbations, nutrient imbalance and physiological disorders. Furthermore, drought causes a remarkable decrease in leaf numbers, relative water content, sugar yield, root yield, chlorophyll a and b and ascorbic acid concentrations. However, the concentrations of total phenolic compounds, electrolyte leakage, lipid peroxidation, amounts of proline, and reactive oxygen species are considerably increased because of drought stress. This negative impact of drought can be eliminated by using plant growth-promoting bacteria (PGPB). Under drought conditions, application of PGPB can improve plant growth by adjusting hormonal balance, maintaining nutrient status and producing plant growth regulators. This role of PGPB positively affects physiological and biochemical characteristics, resulting in increased leaf numbers, sugar yield, relative water content, amounts of photosynthetic pigments and ascorbic acid. Conversely, lipid peroxidation, electrolyte leakage and amounts of proline, total phenolic compounds and reactive oxygen species are decreased under drought in the presence of PGPB. The current review gives an overview on the impact of drought on plants and the pivotal role of PGPB in mitigating the negative effects of drought by enhancing antioxidant defense systems and increasing plant growth and yield to improve sustainable agriculture.

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“…Breakage in plasmid DNA is also one of the critical parameter in determining the genotoxicity of wide range of chemicals and this test is very commonly used in environmental monitoring [89][90][91][92] . Incidence of DNA damage is profound indicator of potential risk of malignancy in human being 93 .…”

Section: Discussionmentioning

confidence: 99%

Genotoxic Hazard and Oxidative Stress Induced by Wastewater Irrigated Soil With Special Reference to Pesticides and Heavy Metal Pollution

Zeyad

Malik

2021

Preprint

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Enhancement of industrial growth and urbanization, soil contamination is increasingly prominent. Therefore, it’s important to examine possible adverse effects of industrial waste. Samples were found to be polluted with several heavy-metals and pesticides. Gas chromatographic results showed occurrence of high-level of organochlorine and organophosphate pesticides. Genotoxicity of soil extracts was assessed using environmental-risk assessment models. Soil samples were extracted in hexane and dichloromethane solvents and were evaluated for genotoxic potential by prokaryotic (Ames test, plasmid nicking assay and E. coli K-12 DNA repair defective mutants) and eukaryotic (Allium cepa root chromosomal aberration and Vigna radiata seed-germination test) bioassays. Strain TA98 was found most susceptible among soil extracts. Hexane soil extract of wastewater irrigation was determined more mutagenic than DCM samples in terms of mutagenic index, mutagenic potential and induction factor for Ames strains. The damage in DNA repair defective mutants of hexane extracts were found higher compared to DCM extracts at dose of 20 μl/ml of culture. Survival in polA, lexA and recA mutants were 39%, 47% and 55% while treated with hexane extract. Allium cepa test, mitotic index was decreased in dose-dependent way and various kinds of chromosomal aberrations were found. Vigna radiata seeds germination and other parameters were also affected when treated with contaminated soil. Oxidative stress in V. radiata roots were also showed under CLS microscope. Genotoxicity of contaminated soil extract was also confirmed by plasmid nicking test. Our study provides possible explanation for the assessment of potential health and environmental hazards of the industrial region.

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Microbe-mediated alleviation of drought stress and acquisition of phosphorus in great millet (Sorghum bicolour L.) by drought-adaptive and phosphorus-solubilizing microbes

Cited by 132 publications

References 60 publications

Isolation of Bacteria with Potential Plant-Promoting Traits and Optimization of Their Growth Conditions

Isolation of Bacteria with Potential Plant-Promoting Traits and Optimization of Their Growth Conditions

The Role of Plant Growth-Promoting Bacteria in Alleviating the Adverse Effects of Drought on Plants

Genotoxic Hazard and Oxidative Stress Induced by Wastewater Irrigated Soil With Special Reference to Pesticides and Heavy Metal Pollution

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