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

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Chen, Z and Cuin, TA and Zhou, M and Twomey, A and Bodapati, PN and Shabala, SN (2007) 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 0032-0889

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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 salttolerant
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 (r¼ –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.

Item Type: Article
Keywords: Glycine betaine, Hordeum vulgare L., potassium flux, proline, reactive oxygen species, salinity.
Journal or Publication Title: Journal of Experimental Biology
Publisher: Oxford University Press
Page Range: pp. 4245-4255
ISSN: 0032-0889
Identification Number - DOI: 10.1093/jxb/erm284
Additional Information:

see http://jxb.oxfordjournals.org/open_access.html for further details

Date Deposited: 07 Apr 2008 14:26
Last Modified: 18 Nov 2014 03:34
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