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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
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, 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: | Zhu, M (Ms Min Zhu) |
| UTAS Author: | Shabala, S (Professor Sergey Shabala) |
| UTAS Author: | Shabala, L (Associate Professor Lana Shabala) |
| UTAS Author: | Fan, Y (Miss Yun Fan) |
| UTAS Author: | Zhou, MX (Professor Meixue Zhou) |
| ID Code: | 98218 |
| Year Published: | 2016 |
| Web of Science® Times Cited: | 53 |
| Deposited By: | Tasmanian Institute of Agriculture |
| Deposited On: | 2015-02-05 |
| Last Modified: | 2017-11-06 |
| Downloads: | 0 |
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