Compatible solute accumulation and stress-mitigating effects in barley genotypes contrasting in their salt tolerance

Chen, Zonghua, Cuin, Tracey A., Zhou, Meixue, Twomey, Amanda, Naidu, Bodapati P. and Shiabala, Sergey (2007) Compatible solute accumulation and stress-mitigating effects in barley genotypes contrasting in their salt tolerance. Journal of Experimental Botany, 58 15-16: 4245-4255. doi:10.1093/jxb/erm284


Author Chen, Zonghua
Cuin, Tracey A.
Zhou, Meixue
Twomey, Amanda
Naidu, Bodapati P.
Shiabala, Sergey
Title Compatible solute accumulation and stress-mitigating effects in barley genotypes contrasting in their salt tolerance
Journal name Journal of Experimental Botany   Check publisher's open access policy
ISSN 0022-0957
1460-2431
Publication date 2007
Sub-type Article (original research)
DOI 10.1093/jxb/erm284
Volume 58
Issue 15-16
Start page 4245
End page 4255
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Formatted abstract
The accumulation of compatible solutes is often regarded as a basic strategy for the protection and survival of plants under abiotic stress conditions, including both salinity and oxidative stress. In this work, a possible causal link between the ability of contrasting barley genotypes to accumulate/synthesize compatible solutes and their salinity stress tolerance was investigated. The impact of H2O2 (one of the components of salt stress) on K+ flux (a measure of stress ‘severity’) and the mitigating effects of glycine betaine and proline on NaCl-induced K+ efflux were found to be significantly higher in salt-sensitive barley genotypes. At the same time, a 2-fold higher accumulation of leaf and root proline and leaf glycine betaine was found in salt-sensitive cultivars. The total amino acid content was also less affected by salinity in salt-tolerant cultivars. In these, potassium was found to be the main contributor to cytoplasmic osmolality, while in salt-sensitive genotypes, glycine betaine and proline contributed substantially to cell osmolality, compensating for reduced cytosolic K+.  Significant negative correlations (r = ¼ –0.89 and –0.94) were observed between Na+-induced K+ efflux (an indicator of salt tolerance) and leaf glycine betaine and proline. These results indicate that hyperaccumulation of known major compatible solutes in barley does not appear to play a major role in salt-tolerance, but rather, may be a symptom of salt-susceptibility. 
Keyword Glycine betaine
Hordeum vulgare L.
Potassium flux
Proline
Reactive oxygen species
Salinity
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Citation counts: TR Web of Science Citation Count  Cited 140 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 03 Sep 2009, 10:29:44 EST by Mr Andrew Martlew on behalf of School of Agriculture and Food Sciences