Rhizospheric bacteria alleviate salt-produced stress in sunflower

Shilev, Stefan; Sancho, Enrique; Benlloch-González, María

doi:10.1016/j.jenvman.2010.07.019

Cited by 61 publications

(29 citation statements)

References 28 publications

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“…The study has been supported by inoculation of strain Bacillus subtilis GB03 that imparts tolerance in A. thaliana under salt stress 31 . Under salt treatment, Pseudomonas fluorescens biotype F and P. fluorescens CECT 378 T inoculation in sunflower results an increase in fresh weight of more than 10% followed by 66%, 34% and 16% in leaves, stems and roots respectively, with accumulation of less Na + /K + in plant tissues 32 . The present study also supports tissue-specific regulation of HKT1 in bacteria-treated shoots.…”

Section: Discussionmentioning

confidence: 99%

Amelioration of Soybean Plant from Saline-Induced Condition by Exopolysaccharide Producing Pseudomonas-Mediated Expression of High Affinity K+-transporter (HKT1) Gene

et al. 2016

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There is a consensus that soil salinization causes decreased agricultural production. Several plants may adapt to survive under high salt stress wherein glycophytes fail to grow. Among transporters in plants, the sodium transporter, also known as high-affinity K + -transporter (HKT1) that comes under the HKT gene family, is involved in uptake of sodium through the roots and its recirculation from shoot to root. In the present study, we have examined the role of transporter HKT1 in soybean plants upon addition of 200 mM NaCl and treatment with Pseudomonas sp. strain AK-1. It is reported that HKT1 is permeable to K + /Na + and systemically alleviates salinity stress through upregulation of gene expression in shoots and down-regulation in roots. Higher transcription levels in shoot recirculate Na + from shoot xylem to root phloem whereas lower transcription levels in root do not allow sodium to enter the plants through root cells. We have also examined role of exopolysaccharide (EPS) produced by strain AK-1 which helps in the binding of free Na + from soil and thus makes Na + unavailable to the soybean plants. Strain with EPS showed decrease in electrical conductivity of soil from 1.1 to 0.9 dS/m in the presence of 200 mM NaCl. In conclusion, treatment with Pseudomonas sp. strain AK-1 exhibits significant rise in shoot/root length, number of lateral roots, shoot/root fresh weight and decreased Na + /K + ratio under salinity stress.

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Section: Discussionmentioning

confidence: 99%

Amelioration of Soybean Plant from Saline-Induced Condition by Exopolysaccharide Producing Pseudomonas-Mediated Expression of High Affinity K+-transporter (HKT1) Gene

et al. 2016

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“…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%

“…For many beneficial plant bacteria interactions in saline conditions, a role has been proposed for the deamination of the ethylene precursor 1-aminocyclopropane-1-carboxylate (ACC), to produce ammonia and α-ketobutyrate (Glick et al, 2007), as a bacterial modulator of growth and tolerance to saline stress in the host, which is supported by reports involving mainly Pseudomonas and Enterobacter species isolated for their ability to metabolize ACC (Mayak et al, 2004; Nadeem et al, 2007; Saravanakumar and Samiyappan, 2007; Ahmad et al, 2013; Chang et al, 2014). 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).…”

Section: Introductionmentioning

confidence: 99%

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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“…Sandhya et al [30] also stated that inoculation with EPS producing isolate significantly increased the length of stem, root, and dry biomass of sunflowers in both stressed and non-stressed water conditions. Shilev et al [31] also observed the increased fresh weight of the plant and improved root development in the sunflower inoculated with Pseudomonas fluorescens under stress conditions. This finding was consistent with the observations of Yu et al [32] regarding the positive and significant effect of Bacillus subtilis on fresh pepper weight.…”

Section: Plant Biomassmentioning

confidence: 91%

Influence of Exopolysaccharide-Producing Bacteria and SiO2 Nanoparticles on Proline Content and Antioxidant Enzyme Activities of Tomato Seedlings (Solanum lycopersicum L.) under Salinity Stress

Isfahani¹,

Tahmourespour²,

Hoodaji³

et al. 2018

Pol. J. Environ. Stud.

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A greenhouse experiment was conducted to evaluate the effects regarding inoculation of exopolysaccharide (EPS)-producing bacterium, the extracted EPS and silicon nanoparticles on Solanum lycopersicum L. seeds under salinity stress, in a completely randomized factorial design with three replicates. The inoculated seeds with silicon nanoparticles (8 gr L -1 ), bacterial EPS (0.01 M), and 1 mL of bacterial suspension (1×10 8 CFU mL -1 ) were sown in pots and irrigated with water at different salinity levels (0.3, 2, 4, 6, and 8 dS m -1 ). Results showed that treatment application could enhance salinity tolerance of tomato seeds and improve plant growth so that combined treatments of EPS and silicon nanoparticles (S.E.N), bacteria and silicon nanoparticles (S.B.N), and EPS with silicon nanoparticles and bacteria (S.E.B.N) were the best treatments for plant growth and improvement regarding salinity levels. The mentioned treatments significantly (p<0.01) increased root and shoot fresh or dry weight in comparison to the control sample. In addition, treatments significantly (p<0.01) decreased proline content and antioxidant enzyme activities. Thus, it can be concluded that applied treatments are suitable for agricultural and environmental applications and bring about less damage caused by salinity stress.

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Rhizospheric bacteria alleviate salt-produced stress in sunflower

Cited by 61 publications

References 28 publications

Amelioration of Soybean Plant from Saline-Induced Condition by Exopolysaccharide Producing <i>Pseudomonas</i>-Mediated Expression of High Affinity K<sup>+</sup>-transporter (HKT1) Gene

Amelioration of Soybean Plant from Saline-Induced Condition by Exopolysaccharide Producing <i>Pseudomonas</i>-Mediated Expression of High Affinity K<sup>+</sup>-transporter (HKT1) Gene

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

Influence of Exopolysaccharide-Producing Bacteria and SiO2 Nanoparticles on Proline Content and Antioxidant Enzyme Activities of Tomato Seedlings (Solanum lycopersicum L.) under Salinity Stress

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