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

Citation

Chen, Z and Cuin, TA and Zhou, M and Twomey, A and Bodapati, PN and Shabala, SN, Compatible solute accumulation and stress-mitigating effects in barley genotypes contrasting in their salt tolerance, Journal of Experimental Biology, 58, (15/16) pp. 4245-4255. ISSN 0022-0957 (2007) [Refereed Article]

DOI: doi:10.1093/jxb/erm284

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= -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. © 2007 The Author(s).

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Crop and Pasture Improvement (Selection and Breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Winter Grains and Oilseeds
Objective Field:Barley
Author:Chen, Z (Mr Zhonghua Chen)
Author:Cuin, TA (Dr Tracey Cuin)
Author:Zhou, M (Associate Professor Meixue Zhou)
Author:Shabala, SN (Professor Sergey Shabala)
ID Code:49929
Year Published:2007
Web of Science® Times Cited:160
Deposited By:Agricultural Science
Deposited On:2007-08-01
Last Modified:2009-08-06
Downloads:0

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