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Evaluating predictive values of various physiological indices for salinity stress tolerance in wheat

Citation

Zhu, M and Shabala, S and Shabala, L and Fan, Y and Zhou, MX, Evaluating predictive values of various physiological indices for salinity stress tolerance in wheat, Journal of Agronomy and Crop Science, 202, (2) pp. 115-124. ISSN 0931-2250 (2016) [Refereed Article]

Copyright Statement

Copyright 2015 Blackwell Verlag GmbH

DOI: doi:10.1111/jac.12122

Abstract

Soil salinity is a worldwide issue that affects agricultural production. The understanding of mechanisms by which plants tolerate salt stress is crucial for breeding varieties for salt tolerance. In this work, a large number of wheat (Triticum aestivum and Triticum turgidum) cultivars were screened using a broad range of physiological indices. A regression analysis was then used to evaluate the relative contribution of each of these traits towards the overall salinity tolerance. In general, most of the bread wheats showed better Na+ exclusion that was associated with higher relative yield. Leaf K+/Na+ ratio and leaf and xylem K+ contents were the major factors determining salinity stress tolerance in wheat. Other important traits included high xylem K+ content, high stomatal conductance and low osmolality. Bread wheat and durum wheat showed different tolerance mechanisms, with leaf K+/Na+ content in durum wheat making no significant contributions to salt tolerance, while the important traits were leaf and xylem K+ contents. These results indicate that Na+ sequestration ability is much stronger in durum compared with bread wheat, most likely as a compensation for its lesser efficiency to exclude Na+ from transport to the shoot. We also concluded that plant survival scores under high salt stress can be used in bread wheat as a preliminary selection for Na+ exclusion gene(s).

Item Details

Item Type:Refereed Article
Keywords:wheat, salinity tolerance, potassium, sodium, stomata density, stomatal conductance
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:Zhu, M (Ms Min Zhu)
Author:Shabala, S (Professor Sergey Shabala)
Author:Shabala, L (Dr Lana Shabala)
Author:Fan, Y (Miss Yun Fan)
Author:Zhou, MX (Associate Professor Meixue Zhou)
ID Code:98218
Year Published:2016
Web of Science® Times Cited:12
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-02-05
Last Modified:2017-11-06
Downloads:0

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