Plant salt-tolerance mechanisms

Deinlein, Ulrich; Stephan, Aaron B.; Horie, Tomoaki; Luo, Weihong; Xu, Guohua; Schroeder, Julian I.

doi:10.1016/j.tplants.2014.02.001

Cited by 1,442 publications

(1,032 citation statements)

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“…Cell metabolism disturbances affect the photophosphorylation, respiratory chain, nitrogen assimilation and protein metabolism rates (Munns, 2002). Plant response to salinity is a complex phenomenon, so that, several studies have been carried out in order to elucidate the mechanisms used by plants to adapt to salt stress (Munns, 2010;Rahnama et al, 2011;Deinlein et al, 2014;Roy et al, 2014;Gupta and Huang, 2014). The salt-tolerance of a certain species depends on the efficiency of physiological mechanisms that make plants more tolerant to high salt concentrations (Flowers, 2004;Moya et al, 1999;Lacerda et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Morpho-physiological adaptation of Jatropha curcas L. to salinity stress

Cavalcante¹,

Santos²,

Filho³

et al. 2018

Aust J Crop Sci

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The aim of the current study is to assess the growth response, biochemical changes, photosynthetic pigments content and gas exchanges of physic nut (Jatropha curcas) grown under natural saline conditions. The experiment was arranged in a completely randomized design based on the following soil electrical conductivities: 0.29 dS.m -1 (control), 1.76 dS.m -1 (moderate salt concentration), 2.61 dS.m -1 (high salt concentration), 3.79 dS.m -1 (very high salt concentration). Physic nut plants were kept under saline conditions for 19 days in greenhouse. Plant growth analyses were performed on a weekly basis. Plant biomass allocation was quantified at the end of the experiment. Leaf gas exchange, stomatal conductance, Fv/Fm and quantum yield were quantified 102 days after planting. Photosynthetic pigments, amino acids, proline and carbohydrates in fresh leaf tissue were also quantified. The leaf antioxidant enzymes catalase (CAT) and ascorbate peroxidase (APX) were quantified. Although there was no alteration in biomass allocation, the initial growth of J. curcas was gradually reduced by increasing salt concentration, which was observed through reduced plant height, stem diameter, and total number of leaves. Soil electrical conductivity 3.79 dS.m -1 was lethal to seedlings. Seedlings exposed to salt stress had their photosynthesis, stomatal conductance, transpiration and effective photochemical efficiency reduced, and their catalase and ascorbate peroxidase enzyme activity increased. Amino acids, proline and carbohydrate concentrations increased due to salt stress, whereas there was decrease in the chlorophyll content. J. curcas is sensitive to soil salinity at electrical conductivity levels higher than 1.76 dS.m -1 . To some extent, salinity effects can be relieved by osmolyte accumulation and by greater antioxidant activity; however, these factors were not sufficient to keep plant growth within normal rates.

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Section: Introductionmentioning

confidence: 99%

Morpho-physiological adaptation of Jatropha curcas L. to salinity stress

Cavalcante¹,

Santos²,

Filho³

et al. 2018

Aust J Crop Sci

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“…osmotic sensing | calcium | salt stress | plastid | abscisic acid P lants exhibit a wide range of physiological responses to cope with water deprivation by drought and salinity stress (1)(2)(3). The properties of biological sensors determine the circumstances and extent to which these coping mechanisms are activated, but the early sensory mechanisms and components regulating the osmotic sensory components in plants are not well understood (see ref.…”

mentioning

confidence: 99%

Rapid hyperosmotic-induced Ca ²⁺ responses in Arabidopsis thaliana exhibit sensory potentiation and involvement of plastidial KEA transporters

Stephan

Kunz

Yang

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Plants experience hyperosmotic stress when faced with saline soils and possibly with drought stress, but it is currently unclear how plant roots perceive this stress in an environment of dynamic water availabilities. Hyperosmotic stress induces a rapid rise in intracellular Ca 2+ concentrations ([Ca 2+ ] i ) in plants, and this Ca 2+ response may reflect the activities of osmo-sensory components. Here, we find in the reference plant Arabidopsis thaliana that the rapid hyperosmoticinduced Ca 2+ response exhibited enhanced response magnitudes after preexposure to an intermediate hyperosmotic stress. We term this phenomenon "osmo-sensory potentiation." The initial sensing and potentiation occurred in intact plants as well as in roots. Having established a quantitative understanding of wild-type responses, we investigated effects of pharmacological inhibitors and candidate channel/transporter mutants. Quintuple mechano-sensitive channels of small conductance-like (MSL) plasma membrane-targeted channel mutants as well as double mid1-complementing activity (MCA) channel mutants did not affect the response. Interestingly, however, double mutations in the plastid K + exchange antiporter (KEA) transporters kea1kea2 and a single mutation that does not visibly affect chloroplast structure, kea3, impaired the rapid hyperosmotic-induced Ca 2+ responses. These mutations did not significantly affect sensory potentiation of the response. These findings suggest that plastids may play an important role in early steps mediating the response to hyperosmotic stimuli. Together, these findings demonstrate that the plant osmosensory components necessary to generate rapid osmotic-induced Ca 2+ responses remain responsive under varying osmolarities, endowing plants with the ability to perceive the dynamic intensities of water limitation imposed by osmotic stress.osmotic sensing | calcium | salt stress | plastid | abscisic acid P lants exhibit a wide range of physiological responses to cope with water deprivation by drought and salinity stress (1-3). The properties of biological sensors determine the circumstances and extent to which these coping mechanisms are activated, but the early sensory mechanisms and components regulating the osmotic sensory components in plants are not well understood (see ref. 4 for review). Pioneering studies have demonstrated that Arabidopsis seedlings expressing the bioluminescent Ca 2+ reporter protein aequorin exhibit a rapid rise in intracellular Ca 2+ ([Ca 2+ ] i ) within seconds upon stimulation by NaCl solution (5, 6). This rapid osmotic-induced Ca 2+ response has been observed in plant species ranging from rice (7) to the basal-branching moss taxon Physcomitrella patens (8), indicating that this response may be conserved across the Plantae kingdom. Solutions of either NaCl or isoosmotic mannitol/sorbitol induce nearly identical rapid Ca 2+ responses, indicating that the nature of this rapid stimulus is largely osmotic rather than ionic (5, 9, 10). Individual seedling responses tend to be quite hetero...

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“…Maintenance of plant hormone homeostasis protects plants from salt-induced damages (Hasanuzzaman et al 2013; Deinlein et al 2014). 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).…”

Section: Resultsmentioning

confidence: 99%

“…High soil salinity causes ion toxicity, osmotic and oxidative stress, and nutrient deficiency and also limits plant’s ability to uptake water from the soil (Bano and Fatima 2009). Multiple morphological, physiological and biochemical processes have been shown to be affected by salt (Munns and Tester 2008; Deinlein et al 2014). …”

Section: Introductionmentioning

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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Plant salt-tolerance mechanisms

Cited by 1,442 publications

References 118 publications

Morpho-physiological adaptation of Jatropha curcas L. to salinity stress

Morpho-physiological adaptation of Jatropha curcas L. to salinity stress

Rapid hyperosmotic-induced Ca ²⁺ responses in Arabidopsis thaliana exhibit sensory potentiation and involvement of plastidial KEA transporters

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

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Plant salt-tolerance mechanisms

Cited by 1,442 publications

References 118 publications

Morpho-physiological adaptation of Jatropha curcas L. to salinity stress

Morpho-physiological adaptation of Jatropha curcas L. to salinity stress

Rapid hyperosmotic-induced Ca 2+ responses in Arabidopsis thaliana exhibit sensory potentiation and involvement of plastidial KEA transporters

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

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Rapid hyperosmotic-induced Ca ²⁺ responses in Arabidopsis thaliana exhibit sensory potentiation and involvement of plastidial KEA transporters