Alleviation of Salt Stress in Pepper (Capsicum annum L.) Plants by Plant Growth-Promoting Rhizobacteria

Hahm, Mi-Seon; Son, Jin-Soo; Hwang, Ye-Ji; Kwon, Duk-Kee; Ghim, Sa‐Youl

doi:10.4014/jmb.1609.09042

Cited by 108 publications

(40 citation statements)

References 37 publications

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“…A similar result was observed for mung bean [41] and soybean [47]. In this respect, Hahm et al [43] noted that the RWC and proline contents of the non-inoculated control plants were lower than those of the plants inoculated under both saline and normal conditions. There are several strategies that EPS-producing bacteria-treated plants use to adapt under stress conditions [48]; among these strategies are the production and/or uptake of osmolytes that may have contributed to maintaining favorable water uptake [33].…”

Section: Discussionsupporting

confidence: 69%

“…Salinity stress causes chlorophyll degradation and/or damages the photosynthetic apparatus by forming proteolytic enzymes, such as chlorophyllase, resulting in a decreased chlorophyll content [25]. Hahm et al [43] also reported that reducing RWC is an ideal action for helping plants to resist osmotic stress. The accumulation of proline under salinity stress is considered to be an indicator in several plant species [14,44].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, EPS-producing bacteria may help in maintaining a film of hydration around the roots and/or help re-establish favorable water potential gradients under water limitations [49]. Hahm et al [43] reported that the increased proline content in pepper plants inoculated with PGPR may be due to PGPR strains enhancing metabolic defense strategies under saline conditions.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Exopolysaccharide-Producing Bacteria and Melatonin on Faba Bean Production in Saline and Non-Saline Soil

El-Ghany

Attia

2020

Agronomy

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Soil salinity is a major threat to modern agriculture, as it affects crop growth and development. The present study focuses on the integration of eco-friendly biostimulants in salinity stress as a strategy to achieve the alleviation of abiotic stress. Field experiments were conducted at two locations, consisting of saline and non-saline soil, to investigate the utilization of exopolysaccharide (EPS)-producing bacteria (Azotobacter chroococcum) and melatonin at different concentrations (0, 25, 50, and 100 µM) for alleviating the adverse effects of salinity on the growth and production of faba bean plants. Salinity stress caused a reduction in all measured parameters of the faba bean plants grown in the saline soil relative to the plants grown in the non-saline soil. The addition of bacteria and/or melatonin significantly increased the growth parameters and yield components under both soils compared to the respective control plants. Both bacteria inoculation and melatonin application enhanced N, P, and K concentrations; the proline content; RWC%; and the K+/Na+ ratio; however, Na+ and Cl− concentrations were decreased significantly in salt-stressed faba beans. The combined use of bacteria and melatonin exhibited the highest stimulating effects. The present study recommends the combined use of EPS-producing bacteria and melatonin for the salinity stress management strategy of faba bean.

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Section: Discussionsupporting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Effect of Exopolysaccharide-Producing Bacteria and Melatonin on Faba Bean Production in Saline and Non-Saline Soil

El-Ghany

Attia

2020

Agronomy

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“…BHU-AV3-inoculated plants had a higher biomass content under salt stress compared to un-inoculated plants, which is probably due to IAA production and nutrient solubilization activity of the BHU-AV3 strain in soil. Several other findings are also available on PGPR producing IAA and nutrient solubilization activities that helped increase plant growth and biomass accumulation in plants as an adaptive response to salt stress (Ali et al, 2014;Qin et al, 2014;Hahm et al, 2017;Pandey and Gupta, 2019). In the present work, a comparative study was performed in root and leaf tissues to evaluate the differences in physiological responses to salt stress upon inoculation with BHU-AV3.…”

Section: Discussionmentioning

confidence: 96%

Sphingobacterium sp. BHU-AV3 Induces Salt Tolerance in Tomato by Enhancing Antioxidant Activities and Energy Metabolism

Vaishnav

Singh

et al. 2020

Front. Microbiol.

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Salt tolerant bacteria can be helpful in improving a plant's tolerance to salinity. Although plant-bacteria interactions in response to salt stress have been characterized, the precise molecular mechanisms by which bacterial inoculation alleviates salt stress in plants are still poorly explored. In the present study, we aimed to determine the role of a salt-tolerant plant growth-promoting rhizobacteria (PGPR) Sphingobacterium BHU-AV3 for improving salt tolerance in tomato through investigating the physiological responses of tomato roots and leaves under salinity stress. Tomato plants inoculated with BHU-AV3 and challenged with 200 mM NaCl exhibited less senescence, positively correlated with the maintenance of ion balance, lowered reactive oxygen species (ROS), and increased proline content compared to the non-inoculated plants. BHU-AV3-inoculated plant leaves were less affected by oxidative stress, as evident from a reduction in superoxide contents, cell death, and lipid peroxidation. The reduction in ROS level was associated with the increased antioxidant enzyme activities along with multiple-isoform expression [peroxidase (POD), polyphenol oxidase (PPO), and superoxide dismutase (SOD)] in plant roots. Additionally, BHU-AV3 inoculation induced the expression of proteins involved in (i) energy production [ATP synthase], (ii) carbohydrate metabolism (enolase), (iii) thiamine biosynthesis protein, (iv) translation protein (elongation factor 1 alpha), and the antioxidant defense system (catalase) in tomato roots. These findings have provided insight into the molecular mechanisms of bacteria-mediated alleviation of salt stress in plants. From the study, we can conclude that BHU-AV3 inoculation effectively induces antioxidant systems and energy metabolism in tomato roots, which leads to whole plant protection during salt stress through induced systemic tolerance.

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“…Under salt stress, the seed germination, lateral root formation and biomass are signi cantly inhibited [7][8]. High salinity has negative effects on various plant processes, causing cell membrane damage and reducing antioxidant activity and osmotic regulation [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Melatonin Promotes Seed Germination Under Salt Stress by Regulating ABA and GA3 in Cotton (Gossypium Hirsutum L.)

Chen

Lü

Liu

et al. 2020

Preprint

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Background: Although previous studies have found that melatonin can promote seed germination, the phytohormone regulation mechanism by which exogenous melatonin mediates salt tolerance during cotton seed germination is still largely unknown. We investigated the effect of melatonin on the germination traits and physiological parameters of GXM9 cotton seeds (Gossypium hirsutum L.) under three salt stress treatments (CK, germination of seeds pretreated with water alone; S, germination of seeds pretreated in 150 mM NaCl under salt stress; SM, germination of seeds pretreated in 20 µM melatonin under 150 mM NaCl solution) in the laboratory.Results: We found that salt stress (150 mM) inhibited cotton seed germination and endogenous melatonin accumulation, and pretreatment with 20 µM exogenous melatonin enhanced the cotton germination rate and hypocotyl length as well as the content of endogenous melatonin during seed germination. This suggests that exogenous melatonin promotes seed germination from a morphological perspective. The contents of starch, α-amylase (EC3.3.1.1), β-galactosidase (EC3.2.1.23), abscisic acid (ABA), and gibberellin (GA) were determined simultaneously. The results showed that the α-amylase and β-galactosidase contents in the cotton seeds decreased by 56.97% and 20.18%, respectively, under salt stress compared with the control, while the starch content increased by 11.53% compared with the control at day 7. The ABA content increased by 25.18% and GA content decreased by 27.99% under salt stress compared with the control at 24 h. When exogenous melatonin was applied to the cotton seeds, the content of α-amylase and β-galactosidase increased by 121.77% and 32.76%, respectively, whereas the starch contents decreased by 13.55% compared with the S treatment at day 7. Similarly, the ABA content increased by 12.20% and the GA content increased by 4.77% at 24 h. To elucidate the molecular mechanism by which melatonin promotes seed germination under salt stress, the effects of ABA- and GA-related genes on plant hormone signal transduction were analyzed by quantitative real-time PCR and RNA sequencing. The results indicated that melatonin regulated the expression of ABA and GA genes in the plant signal transduction pathway, induced embryo root development and seed germination, and alleviated dormancy. We found that the expression of the ABA signaling gene GhABF2 was up-regulated and GhDPBF2 was down-regulated, and the expression of GA signaling genes (e.g., GhGID1C and GhGID1B) was up-regulated by melatonin.Conclusions: We discovered that melatonin enhances salt tolerance in cotton seeds by regulating ABA and GA and by mediating the expression of hormone-related genes in plant hormone signal transduction. This should help us to explore the regulatory mechanisms of cotton resistance and provide a foundation for the cultivation of new varieties.

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Alleviation of Salt Stress in Pepper (Capsicum annum L.) Plants by Plant Growth-Promoting Rhizobacteria

Cited by 108 publications

References 37 publications

Effect of Exopolysaccharide-Producing Bacteria and Melatonin on Faba Bean Production in Saline and Non-Saline Soil

Effect of Exopolysaccharide-Producing Bacteria and Melatonin on Faba Bean Production in Saline and Non-Saline Soil

Sphingobacterium sp. BHU-AV3 Induces Salt Tolerance in Tomato by Enhancing Antioxidant Activities and Energy Metabolism

Melatonin Promotes Seed Germination Under Salt Stress by Regulating ABA and GA3 in Cotton (Gossypium Hirsutum L.)

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