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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]
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, Veterinary and Food Sciences |
| Research Group: | Crop and pasture production |
| Research Field: | Crop and pasture improvement (incl. selection and breeding) |
| Objective Division: | Plant Production and Plant Primary Products |
| Objective Group: | Grains and seeds |
| Objective Field: | Barley |
| UTAS Author: | Chen, Z (Mr Zhonghua Chen) |
| UTAS Author: | Cuin, TA (Dr Tracey Cuin) |
| UTAS Author: | Zhou, M (Professor Meixue Zhou) |
| UTAS Author: | Shabala, SN (Professor Sergey Shabala) |
| ID Code: | 49929 |
| Year Published: | 2007 |
| Web of Science® Times Cited: | 236 |
| Deposited By: | Agricultural Science |
| Deposited On: | 2007-08-01 |
| Last Modified: | 2009-08-06 |
| Downloads: | 0 |
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