Multifunctional Pseudomonas putida strain FBKV2 from arid rhizosphere soil and its growth promotional effects on maize under drought stress

Vurukonda, Sai Shiva Krishna Prasad; Vardharajula, Sandhya; Shrivastava, Manjari; SkZ, Ali

doi:10.1016/j.rhisph.2016.07.005

Cited by 56 publications

(22 citation statements)

References 54 publications

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“…In recent years, the functions of PGPR in improving plant health by promoting resistance to pathogens, insect pests, and abiotic stressors, such as drought and salinity, have been well illustrated [10,11,13]. B. amyloliquefaciens and other members of the genus Bacillus have been implicated in a range of plant functions from plant growth and development to biotic and abiotic stress tolerance.…”

Section: Discussionmentioning

confidence: 99%

Biofilms Positively Contribute to Bacillus amyloliquefaciens 54-induced Drought Tolerance in Tomato Plants

Wang

Jiang

Zhang

et al. 2019

IJMS

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Drought stress is a major obstacle to agriculture. Although many studies have reported on plant drought tolerance achieved via genetic modification, application of plant growth-promoting rhizobacteria (PGPR) to achieve tolerance has rarely been studied. In this study, the ability of three isolates, including Bacillus amyloliquefaciens 54, from 30 potential PGPR to induce drought tolerance in tomato plants was examined via greenhouse screening. The results indicated that B. amyloliquefaciens 54 significantly enhanced drought tolerance by increasing survival rate, relative water content and root vigor. Coordinated changes were also observed in cellular defense responses, including decreased concentration of malondialdehyde and elevated concentration of antioxidant enzyme activities. Moreover, expression levels of stress-responsive genes, such as lea, tdi65, and ltpg2, increased in B. amyloliquefaciens 54-treated plants. In addition, B. amyloliquefaciens 54 induced stomatal closure through an abscisic acid-regulated pathway. Furthermore, we constructed biofilm formation mutants and determined the role of biofilm formation in B. amyloliquefaciens 54-induced drought tolerance. The results showed that biofilm-forming ability was positively correlated with plant root colonization. Moreover, plants inoculated with hyper-robust biofilm (∆abrB and ∆ywcC) mutants were better able to resist drought stress, while defective biofilm (∆epsA-O and ∆tasA) mutants were more vulnerable to drought stress. Taken altogether, these results suggest that biofilm formation is crucial to B. amyloliquefaciens 54 root colonization and drought tolerance in tomato plants.

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Section: Discussionmentioning

confidence: 99%

Biofilms Positively Contribute to Bacillus amyloliquefaciens 54-induced Drought Tolerance in Tomato Plants

Wang

Jiang

Zhang

et al. 2019

IJMS

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“…Interestingly, this effect was at least partially reverted in response to microbial inoculation, particularly in the MCP variants ( Figure 6A). For various PGPRs, arbuscular mycorrhizae, and also plant roots, the ability to increase aggregate stability and the water-holding capacity of the rhizosphere soil by secretion of exopolysaccharides and glomalin is well-documented [65][66][67]. The resulting higher rhizosphere hydration would consequently reduce the salt concentrations in the rhizosphere soil solution and may explain the lower abundance of Sphingobacteriia as salinity indicators.…”

Section: Interactions With the Soil Microbiomementioning

confidence: 99%

“…Moreover, higher water content in the rhizosphere would also improve the nutrient availability under drought stress conditions. Particularly for members of the genera Pseudomonas and Bacillus as dominant bacterial groups in the MCP inoculant, exopolysaccharide production with the potential to promote drought and salinity tolerance of host plants but also mycorrhizal helper functions have been identified [11,41,67,68]. These inoculants might therefore contribute to the superior plant growth-promoting potential of MCP under the investigated culture conditions.…”

Section: Interactions With the Soil Microbiomementioning

confidence: 99%

Microbial Consortia versus Single-Strain Inoculants: An Advantage in PGPM-Assisted Tomato Production?

et al. 2019

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The use of biostimulants with plant growth-promoting properties, but without significant input of nutrients, is discussed as a strategy to increase stress resistance and nutrient use efficiency of crops. However, limited reproducibility under real production conditions remains a major challenge. The use of combination products based on microbial and non-microbial biostimulants or microbial consortia, with the aim to exploit complementary or synergistic interactions and increase the flexibility of responses under different environmental conditions, is discussed as a potential strategy to overcome this problem. This study aimed at comparing the efficiency of selected microbial single-strain inoculants with proven plant-growth promoting potential versus consortium products under real production conditions in large-scale tomato cultivation systems, exposed to different environmental challenges. In a protected greenhouse production system at Timisoara, Romania, with composted cow manure, guano, hair-, and feather-meals as major fertilizers, different fungal and bacterial single-strain inoculants, as well as microbial consortium products, showed very similar beneficial responses. Nursery performance, fruit setting, fruit size distribution, seasonal yield share, and cumulative yield (39–84% as compared to the control) were significantly improved over two growing periods. By contrast, superior performance of the microbial consortia products (MCPs) was recorded under more challenging environmental conditions in an open-field drip-fertigated tomato production system in the Negev desert, Israel with mineral fertilization on a high pH (7.9), low fertility, and sandy soil. This was reflected by improved phosphate (P) acquisition, a stimulation of vegetative shoot biomass production and increased final fruit yield under conditions of limited P supply. Moreover, MCP inoculation was associated with selective changes of the rhizosphere-bacterial community structure particularly with respect to Sphingobacteriia and Flavobacteria, reported as salinity indicators and drought stress protectants. Phosphate limitation reduced the diversity of bacterial populations at the root surface (rhizoplane) and this effect was reverted by MCP inoculation, reflecting the improved P status of the plants. The results support the hypothesis that the use of microbial consortia can increase the efficiency and reproducibility of BS-assisted strategies for crop production, particularly under challenging environmental conditions.

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“…An alternative strategy to mitigate climate change impacts on plant fitness is the utilization of beneficial mutualistic plant-microorganism interactions in the rhizosphere. Such mutulism can offer enhancement of root nutrient uptake and biomass productivity, and potentially improved plant acclimation to abiotic stresses (Mirshad and Puthur, 2017;Vurukonda et al, 2016b). Identification of rhizospheric microbes capable of conferring stress tolerance to their plant hosts, and employing symbiont-based approaches to understanding and improving root biomass production, whole plant productivity and/or soil carbon storage, could significantly contribute to reducing the negative impact of abiotic stresses on plant ecosystem function.…”

Section: Regionmentioning

confidence: 99%

Rhizosphere engineering: Enhancing sustainable plant ecosystem productivity

White²,

et al. 2017

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The rhizosphere is arguably the most complex microbial habitat on earth, comprising an integrated network of plant roots, soil and a diverse microbial consortium of bacteria, archaea, viruses, and microeukaryotes. Understanding, predicting and controlling the structure and function of the rhizosphere will allow us to harness plantmicrobe interactions and other rhizosphere activities as a means to increase or restore plant ecosystem productivity, improve plant responses to a wide range of environmental perturbations, and mitigate effects of climate change by designing ecosystems for longterm soil carbon storage. Here, we review critical knowledge gaps in rhizosphere 2 science, and how mechanistic understanding of rhizosphere interactions can be leveraged in rhizosphere engineering efforts with the goal of maintaining sustainable plant ecosystem services for food and bioenergy production in an ever changing global climate.

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Multifunctional Pseudomonas putida strain FBKV2 from arid rhizosphere soil and its growth promotional effects on maize under drought stress

Cited by 56 publications

References 54 publications

Biofilms Positively Contribute to Bacillus amyloliquefaciens 54-induced Drought Tolerance in Tomato Plants

Biofilms Positively Contribute to Bacillus amyloliquefaciens 54-induced Drought Tolerance in Tomato Plants

Microbial Consortia versus Single-Strain Inoculants: An Advantage in PGPM-Assisted Tomato Production?

Rhizosphere engineering: Enhancing sustainable plant ecosystem productivity

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