Mechanisms of plant response to salt and drought stress and their alteration by rhizobacteria

Forni, C.; Duca, Daiana; Glick, Bernard R.

doi:10.1007/s11104-016-3007-x

Cited by 354 publications

(232 citation statements)

References 157 publications

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“…Exposure of plants to environmental stresses can lead to the production of reactive oxygen species (ROS) that can damage plant macromolecules. In addition to plants, microbes can augment the supply of enzymatic and nonenzymatic metabolites to detoxify the impact of ROS [32,33]. Previously, bioassays for the antioxidant system have also been reported with different plants and microorganisms [34,35].…”

Section: Discussionmentioning

confidence: 99%

“…Elevated levels of ethylene can suppress the root system, which can result in compromised plant growth and development. Salt-tolerant rhizobacteria have the ability to produce the enzyme ACC-deaminase, which can degrade the substrate (ACC) of ethylene into α-ketobutyrate and ammonia [13,32]. Hence, the ACC-deaminase activity of rhizobacteria mitigates deleterious levels of stress-induced ethylene.…”

Section: Discussionmentioning

confidence: 99%

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Halotolerant Bacterial Diversity Associated with Suaeda fruticosa (L.) Forssk. Improved Growth of Maize under Salinity Stress

Aslam

Ali

2018

Agronomy

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Abstract:Halotolerant bacterial strains associated with the rhizosphere and phytoplane of Suaeda fruticosa (L.) Forssk. growing in saline habitats were isolated to mitigate the salinity stress of Zea mays L. 16S rRNA gene sequencing confirmed the presence of strains that belong to Gracilibacillus, Staphylococcus, Virgibacillus, Salinicoccus, Bacillus, Zhihengliuella, Brevibacterium, Oceanobacillus, Exiguobacterium, Pseudomonas, Arthrobacter, and Halomonas genera. Strains were screened for auxin production, 1-aminocyclopropane-1-carboxylate (ACC)-deaminase, and biofilm formation. Bacterial auxin production ranged from 14 to 215 µg mL −1 . Moreover, several bacterial isolates were also recorded as positive for ACC-deaminase activity, phosphate solubilization, and biofilm formation. In pot trials, bacterial strains significantly mitigated the salinity stress of Z. mays seedlings. For instance, at 200 and 400 mM NaCl, a significant increase of shoot and root length (up to onefold) was recorded for Staphylococcus jettensis F-11. At 200 mM, Zhihengliuella flava F-9 (45%) and Bacillus megaterium F-58 (42%) exhibited significant improvements for fresh weight. For dry weight, S. jettensis F-11 and S. arlettae F-71 recorded up to a threefold increase at 200 mM over the respective control. The results of this study suggest that natural plant settings of saline habitats are a good source for the isolation of beneficial salt-tolerant bacteria to grow crops under saline conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Halotolerant Bacterial Diversity Associated with Suaeda fruticosa (L.) Forssk. Improved Growth of Maize under Salinity Stress

Aslam

Ali

2018

Agronomy

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“…This results in lower plant ethylene concentrations, continued root elongation, and greater resistance to water stress (Mayak et al, 2004;Glick, 2005;Shaharoona et al, 2007;Naveed et al, 2008;Nadeem et al, 2010). To date, studies conducted on these bacteria have primarily focused on their isolation and subsequent testing as inocula for crops grown in the greenhouse or field [for reviews, see Saleem et al (2007) and Forni et al (2017)]. Rarely have studies examined the natural abundance and diversity of indigenous ACC+ populations in rhizospheres (Timmusk et al, 2011) and none has studied the indigenous populations of the semiarid Great Plains region of the United States, despite the potential for their positive influence on plant growth under water stress.…”

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confidence: 99%

Genotype-Specific Enrichment of 1-Aminocyclopropane-1-Carboxylic Acid Deaminase-Positive Bacteria in Winter Wheat Rhizospheres

Stromberger

Abduelafez

Byrne

et al. 2017

Soil Science Society of America Journal

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Bacteria that produce 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase can promote plant growth under abiotic stress by lowering stress ethylene levels through deamination of ACC, the immediate precursor of ethylene. Unfortunately, little is known regarding the natural abundance and diversity of ACC deaminase-positive (ACC+) bacteria in soils or how ACC+ bacteria are influenced by plant genotype. Two field studies were conducted to assess the abundance, composition, and ACC deaminase activity of ACC+ bacteria in plots planted to different winter wheat (Triticum aestivum L.) genotypes under different irrigation regimes. In the first study, the relative abundance of ACC+ bacteria in wheat rhizospheres increased over time as soil water availability decreased. Relative abundance was also affected by genotype, with the greatest percentage of ACC+ bacteria in the rhizosphere of 'RonL' grown with limited or no irrigation (up to 54% at mid-grain filling). Species composition also varied by wheat genotype regardless of irrigation treatment. In the second study, the RonL rhizosphere had the greatest ACC deaminase activity and greatest predicted abundance of ACC+ bacteria, on the basis of Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt) analysis of 16S rDNA sequences, compared with other genotypes. In conclusion, the relative abundance, composition, and activity of culturable and predicted communities of ACC+ bacteria differed according to winter wheat genotype; therefore, the potential for ACC+ bacteria to promote drought resistance in winter wheat may be genotype-dependent. A mong the many ecosystem services provided by soil bacteria, perhaps none is as important within agricultural systems as supporting plant growth. Soil bacteria that influence plant growth positively are called plant growth-promoting bacteria (Bashan and Holguin, 1998). These bacteria reside within root tissues, on the root surface, and in the rhizosphere soil, where they can improve plant growth by increasing the availability of nutrients to plants, producing phytohormones that regulate plant growth, and antagonizing and outcompeting plant pathogens in the soil environment (Lugtenberg and Kamilova, 2009;Chaparro et al., 2012).Water scarcity is among the most difficult of the challenges facing agricultural sustainability and food security. Of growing interest is the ability of certain PGPRs to reduce the effects on plants of abiotic stress in the environment, includ- Core Ideas• 1-Aminocyclopropane-1-carboxylic acid (ACC) deaminase-positive (ACC+) bacteria were studied in field soils planted to winter wheat.• The relative abundance of ACC+ bacteria increased in wheat rhizospheres as soil water availability decreased.• ACC+ bacterial abundance, composition, and deaminase activity were influenced by wheat genotype.• The ability of ACC+ bacteria to promote drought resistance may be dependent on wheat genotype.

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“…The involvement of auxin in plant stress tolerance has been well established (Fu and Wang 2011; Pieterse et al 2012; Naseem et al 2015; Forni et al 2017). Based on previous studies showing the critical role of auxin signalling in controlling plant responses to VCs produced by various microbes (Zhang et al 2007; Splivallo et al 2009; Bailly et al 2014; Bitas et al 2015; Garnica-Vergara et al 2016), we investigated how VCs produced by two V. dahliae strains affect the growth of A. thaliana mutants defective in auxin influx ( aux1-7 ) or response ( tir1-1 and axr1-3 ) in the presence of 100 mM NaCl.…”

Section: Resultsmentioning

confidence: 99%

Do volatile compounds produced by Fusarium oxysporum and Verticillium dahliae affect stress tolerance in plants?

Kang

2018

Mycology

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Volatile compounds (VCs) produced by diverse microbes seem to affect plant growth, development and/or stress tolerance. We investigated how VCs released by soilborne fungi Fusarium oxysporum and Verticillium dahliae affect Arabidopsis thaliana responses to abiotic and biotic stresses. Under salt stress, VCs from both fungi helped its growth and increased chlorophyll content. However, in contrast to wild-type A. thaliana (Col-0), V. dahliae VCs failed to increase leaf surface area in auxin signalling mutants aux1-7, tir1-1 and axr1-3. Compared to wild-type Col-0, the degree of lateral root density enhanced by V. dahliae VCs in these mutants was also reduced. Consistent with the involvement of auxin signalling in fungal VC-mediated salt torelance, A. thaliana line carrying DR5::GUS displayed increased auxin accumulation in root apex upon exposure to V. dahliae VCs, and 1-naphthylphthalamic acid, an auxin transport inhibitor, adversely affected V. dahliae VC-mediated salt tolerance. F. oxysporum VCs induced the expression of PR1 but not PDF1.2 in A. thaliana lines containing PR1::GUS and PFD1.2::GUS. When challenged with Pseudomonas syringae after the exposure to F. oxysporum VCs, A. thaliana showed reduced disease symptoms. However, the number of bacterial cells in F. oxysporum VC-treated plants was not significantly different from that in control plants.

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Mechanisms of plant response to salt and drought stress and their alteration by rhizobacteria

Cited by 354 publications

References 157 publications

Halotolerant Bacterial Diversity Associated with Suaeda fruticosa (L.) Forssk. Improved Growth of Maize under Salinity Stress

Halotolerant Bacterial Diversity Associated with Suaeda fruticosa (L.) Forssk. Improved Growth of Maize under Salinity Stress

Genotype-Specific Enrichment of 1-Aminocyclopropane-1-Carboxylic Acid Deaminase-Positive Bacteria in Winter Wheat Rhizospheres

Do volatile compounds produced by Fusarium oxysporum and Verticillium dahliae affect stress tolerance in plants?

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