Induction of drought tolerance in Pennisetum glaucum by ACC deaminase producing PGPR- Bacillus amyloliquefaciens through Antioxidant defense system

Murali, M.; Singh, Sanjay; Gowtham, Hittanahallikoppal Gajendramurthy; Shilpa, N.; Melvin, Prasad; Aiyaz, Mohammed; Amruthesh, K. N.

doi:10.1016/j.micres.2021.126891

Cited by 48 publications

(26 citation statements)

References 49 publications

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“…The inoculation with ACC deaminase producing PGPR altered the plant biomass, relative water content, photosynthetic rate, phytohormones contents, ACC content, ethylene emission, membrane lipid peroxidation, production of ROS scavenging enzymes, and osmoprotectantsfor enabling the plants’ ability to withstand drought stress [ 36 , 79 , 80 ]. Murali et al [ 81 ] have demonstrated that ACC deaminase producing B. amyloliquefaciens could protect P. glaucum plants against severe drought conditions via inducing an antioxidant defense system, thus promising its application in the management of drought stress. Therefore, it has been shown that PGPR use ACC deaminase production as a key mechanism for alleviating drought stress in plants and ensuring their survival, as well as overall growth and development.…”

Section: Plant Growth Promoting Rhizobacteria Mediated Drought Stress...mentioning

confidence: 99%

“…The strong induction of stress responsive gene expression is critical for plant survival during drought [ 139 , 140 ]. Recently, molecular approaches have been employed to study the gene expression and physiological functions involved in plant tolerance induction against drought stress [ 78 , 81 ]. Using quantitative real-time PCR (qRT-PCR), the stress-related gene upregulation in bacterial colonized plant leaves is detected as the increased activity of enzymes provides drought stress tolerance when the plants are primed with PGPR, thereby alleviating the deleterious effects of drought stress.…”

Section: Plant Growth Promoting Rhizobacteria Mediated Drought Stress...mentioning

confidence: 99%

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Insight into Recent Progress and Perspectives in Improvement of Antioxidant Machinery upon PGPR Augmentation in Plants under Drought Stress: A Review

Gowtham¹,

Singh

Shilpa

et al. 2022

Antioxidants

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Agriculture has a lot of responsibility as the rise in the world’s population demands more food requirements. However, more than one type of biotic and abiotic stress continually impacts agricultural productivity. Drought stress is a major abiotic stress that significantly affects agricultural productivity every year as the plants undergo several morphological, biochemical, and physiological modifications, such as repressed root and shoot growth, reduced photosynthesis and transpiration rate, excessive production of reactive oxygen species (ROS), osmotic adjustments, and modified leaf senescence regulating and stress signaling pathways. Such modifications may permanently damage the plants; therefore, mitigation strategies must be developed. The use of drought resistant crop cultivars is more expensive and labor-intensive with few advantages. However, exploiting plant growth promoting rhizobacteria (PGPR) is a proven alternative with numerous direct and indirect advantages. The PGPR confers induced systemic tolerance (IST) mechanisms in plants in response to drought stress via multiple mechanisms, including the alteration of root architecture, maintenance of high relative water content, improvement of photosynthesis rate, production of phytohormones, exopolysaccharides, ACC deaminase, carotenoids and volatiles, induction of antioxidant defense system, and alteration in stress-responsive gene expression. The commercial application of PGPR as bioinoculants or biostimulants will remain contingent on more robust strain selection and performance under unfavorable environmental conditions. This review highlights the possible mechanisms of PGPR by activating the plant adaptive defense systems for enhancing drought tolerance and improving overall growth and yield.

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Section: Plant Growth Promoting Rhizobacteria Mediated Drought Stress...mentioning

confidence: 99%

Section: Plant Growth Promoting Rhizobacteria Mediated Drought Stress...mentioning

confidence: 99%

Insight into Recent Progress and Perspectives in Improvement of Antioxidant Machinery upon PGPR Augmentation in Plants under Drought Stress: A Review

Gowtham¹,

Singh

Shilpa

et al. 2022

Antioxidants

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“…This PGPR strain was screened (Fig. 1b) for the production of 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase enzyme (Murali et al 2021) prior to use. Bacterial isolate was grown in 50ml tryptic soybean broth (TSB) medium for 24 hours at 30 ℃ at 120 rpm.…”

Section: Site Descriptionmentioning

confidence: 99%

Moisture- and period-dependent interactive effects of plant growth-promoting rhizobacteria and AM fungus on water use and yield formation in dryland wheat

et al. 2022

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In drought-prone soils, plant growth-promoting rhizobacteria (PGPR) and arbuscular mycorrhizal fungus (AMF) might positively affect water uptake and crop yield via rhizosphere interactions. MethodsSole and combined additions of Bacillus amyloliquefaciens producing 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase and Rhizophagus irregularis into rhizospheric soils were performed under wellwatered (WW; 80% eld water capacity), moderate water stress (MWS; 50% FWC) and severe water stress (SWS; 35% FWC) in pot-cultured wheat (Triticum aestivum L.). ResultsIn moderate and severe drought stress, water use e ciency (WUE B ) was increased by 27.9-34.3% in PGPR and 20-22.1% in AMF treatments, respectively, and grain yield was improved by 20.03-30.77% in PGPR and 12.13-34.34% in AMF treatments, respectively, compared with CK. Importantly, the coinoculation of AMF and PGPR signi cantly promoted WUE B by 57.46-98.49% and grain yield by 131.82-94.94% compared to the average value of two sole inoculations in MWS and SWS treatments, respectively. Biomass production followed a similar trend as yield. Particularly, the above parameters were signi cantly enhanced with the prolonged developmental stages (p < 0.05). ACC deaminase signi cantly reduced ACC accumulation in MWS and SWS, enhanced AMF root colonization, and promoted rhizosphere microbial biomass carbon and nitrogen levels across all three developing stages. Furthermore, AMF-PGPR co-inoculation enhanced chlorophyll and carotenoid contents during anthesis while reducing them during pre-harvesting. Enhanced water uptake and root activities upsurged photosynthetic attributes throughout the growing season. ConclusionAMF-PGPR co-inoculation acted as a promising solution to cope with the droughted environment via root activities for stronger water capture.

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“…Plants produce increased amounts of ethylene upon imposition of drought stress, and thereby, stress susceptible plants produce higher levels of ethylene than stress-tolerant ones (Balota et al, 2004 ). The stress releasing action of ACC deaminase containing ( acdS + ) PGPR strains is based on a negative influence on ethylene production on plant growth combined with the support of the antioxidative systems of the plant (Jaemsaeng et al, 2018 ; Gowtham et al, 2020 ; Murali et al, 2021 ). At the functional level, extensive literature exists on the positive effect of the inoculation of acdS + PGPR strains to increase drought tolerance and mitigate drought stress in plants (e.g., Arshad et al, 2008 ; Shakir et al, 2012 ; Danish et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Water Deficit History Selects Plant Beneficial Soil Bacteria Differently Under Conventional and Organic Farming

et al. 2022

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Water deficit tolerance is critical for plant fitness and survival, especially when successive drought events happen. Specific soil microorganisms are however able to improve plant tolerance to stresses, such as those displaying a 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity. Microorganisms adapted to dry conditions can be selected by plants over time because of properties such as sporulation, substrate preference, or cell-wall thickness. However, the complexity and interconnection between abiotic factors, like drought or soil management, and biotic factors, like plant species identity, make it difficult to elucidate the general selection processes of such microorganisms. Using a pot experiment in which wheat and barley were grown on conventional and organic farming soils, we determined the effect of water deficit history on soil microorganisms by comparing single and successive events of water limitation. The analysis showed that water deficit strongly impacts the composition of both the total microbial community (16S rRNA genes) and one of ACC deaminase-positive (acdS+) microorganisms in the rhizosphere. In contrast, successive dry conditions moderately influence the abundance and diversity of both communities compared to a single dry event. We revealed interactive effects of the farming soil type and the water deficit conditioning treatment. Indeed, possibly due to better nutrient status, plants grown on soils from conventional farming showed higher growth and were able to select more adapted microbial taxa. Some of them are already known for their plant-beneficial properties like the Actinobacteria Streptomyces, but interestingly, some Proteobacteria were also enriched after a water deficit history under conventional farming. Our approach allowed us to identify key microbial taxa promoting drought adaptation of cereals, thus improving our understanding of drought effects on plant-microbe interactions.

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Induction of drought tolerance in Pennisetum glaucum by ACC deaminase producing PGPR- Bacillus amyloliquefaciens through Antioxidant defense system

Cited by 48 publications

References 49 publications

Insight into Recent Progress and Perspectives in Improvement of Antioxidant Machinery upon PGPR Augmentation in Plants under Drought Stress: A Review

Insight into Recent Progress and Perspectives in Improvement of Antioxidant Machinery upon PGPR Augmentation in Plants under Drought Stress: A Review

Moisture- and period-dependent interactive effects of plant growth-promoting rhizobacteria and AM fungus on water use and yield formation in dryland wheat

Water Deficit History Selects Plant Beneficial Soil Bacteria Differently Under Conventional and Organic Farming

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