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231225s2019 xx |||||o 00| ||eng c |
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|a 10.1093/jxb/erz367
|2 doi
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|a eng
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|a Su, Nana
|e verfasserin
|4 aut
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|a GABA operates upstream of H+-ATPase and improves salinity tolerance in Arabidopsis by enabling cytosolic K+ retention and Na+ exclusion
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|c 2019
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 10.08.2020
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|a Date Revised 19.10.2023
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|a published: Print
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|a Citation Status MEDLINE
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|a © The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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|a The non-protein amino acid γ-aminobutyric acid (GABA) rapidly accumulates in plant tissues in response to salinity. However, the physiological rationale for this elevation remains elusive. This study compared electrophysiological and whole-plant responses of salt-treated Arabidopsis mutants pop2-5 and gad1,2, which have different abilities to accumulate GABA. The pop2-5 mutant, which was able to overaccumulate GABA in its roots, showed a salt-tolerant phenotype. On the contrary, the gad1,2 mutant, lacking the ability to convert glutamate to GABA, showed oversensitivity to salinity. The greater salinity tolerance of the pop2-5 line was explained by: (i) the role of GABA in stress-induced activation of H+-ATPase, thus leading to better membrane potential maintenance and reduced stress-induced K+ leak from roots; (ii) reduced rates of net Na+ uptake; (iii) higher expression of SOS1 and NHX1 genes in the leaves, which contributed to reducing Na+ concentration in the cytoplasm by excluding Na+ to apoplast and sequestering Na+ in the vacuoles; (iv) a lower rate of H2O2 production and reduced reactive oxygen species-inducible K+ efflux from root epidermis; and (v) better K+ retention in the shoot associated with the lower expression level of GORK channels in plant leaves
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Arabidopsis
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|a H+-ATPase
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|a hydrogen peroxide
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|a potassium retention
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|a reactive oxygen species
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|a sodium sequestration
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|a Ions
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|a gamma-Aminobutyric Acid
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|a Sodium
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|a 9NEZ333N27
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|a Hydrogen Peroxide
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|a BBX060AN9V
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|a Proton-Translocating ATPases
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|a EC 3.6.3.14
|2 NLM
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|a Potassium
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|2 NLM
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|a Wu, Qi
|e verfasserin
|4 aut
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|a Chen, Jiahui
|e verfasserin
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|a Shabala, Lana
|e verfasserin
|4 aut
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|a Mithöfer, Axel
|e verfasserin
|4 aut
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|a Wang, Haiyang
|e verfasserin
|4 aut
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|a Qu, Mei
|e verfasserin
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|a Yu, Min
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|a Cui, Jin
|e verfasserin
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|a Shabala, Sergey
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 70(2019), 21 vom: 18. Nov., Seite 6349-6361
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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|g volume:70
|g year:2019
|g number:21
|g day:18
|g month:11
|g pages:6349-6361
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|u http://dx.doi.org/10.1093/jxb/erz367
|3 Volltext
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