Evaluating Predictive Values of Various Physiological Indices for Salinity Stress Tolerance in Wheat

M. Zhu, S. Shabala, L. Shabala, Y. Fan, M. X. Zhou

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

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).

Original languageEnglish
Pages (from-to)115-124
Number of pages10
JournalJournal of Agronomy and Crop Science
Volume202
Issue number2
DOIs
Publication statusPublished - 1 Apr 2016
Externally publishedYes

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