The plant-growth-promoting bacterium Klebsiella sp. SBP-8 confers induced systemic tolerance in wheat (Triticum aestivum) under salt stress

Singh, Raju; Jha, Pallavi

doi:10.1016/j.jplph.2015.07.002

Cited by 204 publications

(107 citation statements)

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“…Orhan et al [42] reported the salt-stress alleviation of wheat by halotolerant and halophilic PGPR that exhibited ACC-deaminase activity. Halotolerant Klebsiella with ACC-deaminase activity has also been shown to promote the vegetative growth parameters and chlorophyll content of plants under salt stress [43]. Similarly, Tank and Saraf [44] reported the positive effects of ACC-deaminase-containing bacteria on plant growth against salinity stress.…”

Section: Discussionmentioning

confidence: 93%

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: 93%

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

Aslam

Ali

2018

Agronomy

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“…When such requirements are not adequately met, null or undesirable effects in plant growth have been observed in other systems (Xie et al, 1996; Persello-Cartieaux et al, 2003). On the other hand, a case for the involvement of ACC deamination as the main bacterial modulator of growth and tolerance to saline stress in plants is supported by examples involving AcdS mutants of Pseudomonas species (Cheng et al, 2012; Ali et al, 2014; Han et al, 2015) but, for the most part of the reports in literature, the actual extent of the contribution of this bacterial enzyme to salinity tolerance induction in the host is not explored in detail, and has been mostly inferred from the existence of a functional AcdS in active bacterial isolates (Onofre-Lemus et al, 2009; Ahmad et al, 2013; Chang et al, 2014; Singh et al, 2015). However, it is worth noting that, in several cases, high ACC deaminase activity levels in isolates do not correlate with a better performance in salinity tolerance induction (Zheng et al, 2008; Tank and Saraf, 2010; Tiwari et al, 2011; Liu et al, 2013; Mapelli et al, 2013; Ramadoss et al, 2013), or even growth promotion activity in general (Dey et al, 2004; Long et al, 2008; Bruto et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Interestingly, it has been found that colonization of plants by certain specific plant growth promoting rhizobacteria (PGPR) can lead to enhanced resistance to abiotic challenges, such as water deficit (Naveed et al, 2014), salinity (Sziderics et al, 2007), adaptation to transplantation (Nowak and Shulaev, 2003), and chilling (Ait Barka et al, 2006). Over the last few years, several studies have reported the ability of isolated microorganisms to induce plant tolerance to salinity once they have been inoculated to seeds or young plantlets (reviewed in Yang et al, 2009; Dodd and Pérez-Alfocea, 2012; Shrivastava and Kumar, 2015), including a variety of hosts, like wheat (Nadeem et al, 2013; Singh et al, 2015), maize (Hamdia et al, 2004; Nadeem et al, 2009), cotton (Liu et al, 2013; Egamberdieva et al, 2015), tomato (Mayak et al, 2004; Ali et al, 2014), lettuce (Barassi et al, 2006; Kohler et al, 2009), sunflower (Shilev et al, 2010; Tewari and Arora, 2014) and Arabidopsis (Zhang et al, 2008; Kim et al, 2014; Sukweenadhi et al, 2015). Among the PGPR that have been demonstrated to play a role in salt stress tolerance induction, a wide diversity of bacteria is included, encompassing several members of the γ-proteobacteria class, specially within the genus Pseudomonas (Ahmad et al, 2013; Nadeem et al, 2013; Chang et al, 2014; Han et al, 2015), α-proteobacteria belonging to the Azospirillum genus (del Amor and Cuadra-Crespo, 2011; Nia et al, 2012; Sahoo et al, 2014), and β-proteobacteria like Achromobacter (Mayak et al, 2004) or Paraburkholderia (Talbi et al, 2013; Pinedo et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Other phytohormone-related bacterial functions, like the ability to modulate indoleacetic acid (IAA) levels, have also been proposed to play a role in plant salt stress tolerance induction (Shilev et al, 2010; Wu et al, 2012; Egamberdieva et al, 2015). However, it is not easy to rule out the contribution of additional putative growth promotion functions, like the production of siderophore compounds, which is frequently observed in bacterial isolates effective in amelioration of abiotic stress (Barriuso et al, 2008; Shilev et al, 2010; Tiwari et al, 2011; Ramadoss et al, 2013; Liu and Zhang, 2015; Singh et al, 2015; Lee et al, 2016). These may act as stimulating compounds by themselves, activating a tolerance response within the plant (Aznar and Dellagi, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Volatile-Mediated Effects Predominate in Paraburkholderia phytofirmans Growth Promotion and Salt Stress Tolerance of Arabidopsis thaliana

et al. 2016

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Abiotic stress has a growing impact on plant growth and agricultural activity worldwide. Specific plant growth promoting rhizobacteria have been reported to stimulate growth and tolerance to abiotic stress in plants, and molecular mechanisms like phytohormone synthesis and 1-aminocyclopropane-1-carboxylate deamination are usual candidates proposed to mediate these bacterial effects. Paraburkholderia phytofirmans PsJN is able to promote growth of several plant hosts, and improve their tolerance to chilling, drought and salinity. This work investigated bacterial determinants involved in PsJN stimulation of growth and salinity tolerance in Arabidopsis thaliana, showing bacteria enable plants to survive long-term salinity treatment, accumulating less sodium within leaf tissues relative to non-inoculated controls. Inactivation of specific bacterial genes encoding ACC deaminase, auxin catabolism, N-acyl-homoserine-lactone production, and flagellin synthesis showed these functions have little influence on bacterial induction of salinity tolerance. Volatile organic compound emission from strain PsJN was shown to reproduce the effects of direct bacterial inoculation of roots, increasing plant growth rate and tolerance to salinity evaluated both in vitro and in soil. Furthermore, early exposure to VOCs from P. phytofirmans was sufficient to stimulate long-term effects observed in Arabidopsis growth in the presence and absence of salinity. Organic compounds were analyzed in the headspace of PsJN cultures, showing production of 2-undecanone, 7-hexanol, 3-methylbutanol and dimethyl disulfide. Exposure of A. thaliana to different quantities of these molecules showed that they are able to influence growth in a wide range of added amounts. Exposure to a blend of the first three compounds was found to mimic the effects of PsJN on both general growth promotion and salinity tolerance. To our knowledge, this is the first report on volatile compound-mediated induction of plant abiotic stress tolerance by a Paraburkholderia species.

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“…Some studies have suggested that 1-aminocyclopropane-1 carboxylate deaminase (ACCD) activity plays a key role in the protection of plants from the deleterious effects of abiotic stress such as heat (Glick et al, 2007;Singh et al, 2015). Cohen et al, (2009) suggested that Azospirillum sp.…”

Section: Rhizobacteria Induced Tolerance To Heatmentioning

confidence: 99%

Rhizobacteria Pseudomonas fluorescens and Azospirillum sp. association enhances growth of Lactuca sativa L. under tropical conditions

Aponte

Castillo

Cabrera

et al. 2017

JCEA

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The selection of microorganisms that enhance plant growth and confer biotic and abiotic tolerance to crops constitutes a biotechnology currently gaining importance on a global scale. The aim of this investigation was to evaluate the effects of inoculating rhizobacteria to lettuce (Lactuca sativa L.) on seed germination and vegetative development in order to use isolates as potential biofertilizers under tropical conditions. Five isolates of Pseudomonas fluorescens (Pf) and one of Azospirillum sp. (Az) were inoculated to seeds using a bacterial suspension of 1.5*10 8 CFU*mL -1 . In vitro, none of the isolates promoted germination. In vivo, isolates promoted growth and acted as stress alleviators by conferring tolerance to high temperatures (≥ 30 °C). The highest seedling emergence percentages were induced by the association of P.fluorescens with Azospirillum. This association also promoted the highest leaf-area in 25 d seedlings and exhibited a significantly higher dry-weight in 40 d plants compared to the control (P≤0.05) supporting the advantages of bio-consortiums over individual strains. The strains were able to produce dependent L-tryptophan indole-3-acetic acid (IAA), to solubilize phosphorous in vitro and tolerated at least 5%-salt stress. The results indicate that isolate Pf (26) and Az possess plant growth promoting rhizobacteria (PGPR) traits and should be further assessed. This study suggests that P. fluorescens and Azospirillum act synergically and are able to trigger an induced-tolerance mechanism in lettuce under abiotic stress.

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The plant-growth-promoting bacterium Klebsiella sp. SBP-8 confers induced systemic tolerance in wheat (Triticum aestivum) under salt stress

Cited by 204 publications

References 59 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

Volatile-Mediated Effects Predominate in Paraburkholderia phytofirmans Growth Promotion and Salt Stress Tolerance of Arabidopsis thaliana

Rhizobacteria Pseudomonas fluorescens and Azospirillum sp. association enhances growth of Lactuca sativa L. under tropical conditions

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