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Unravelling the physiological basis of salinity stress tolerance in cultivated and wild rice species

Citation

Shahzad, B and Yun, P and Shabala, L and Zhou, M and Sellamuthu, G and Venkataraman, G and Chen, ZH and Shabala, SN, Unravelling the physiological basis of salinity stress tolerance in cultivated and wild rice species, Functional Plant Biology, 49, (4) pp. 351-364. ISSN 1445-4408 (2022) [Refereed Article]


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© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) License, https://creativecommons.org/licenses/by-nc-nd/4.0/

Official URL: https://www.publish.csiro.au/FP/FP21336

DOI: doi:10.1071/FP21336

Abstract

Wild rice species provide a rich source of genetic diversity for possible introgression of salinity stress tolerance in cultivated rice. We investigated the physiological basis of salinity stress tolerance in Oryza species by using six rice genotypes (Oryza sativa L.) and four wild rice species. Three weeks of salinity treatment significantly (P < 0.05) reduced physiological and growth indices of all cultivated and wild rice lines. However, the impact of salinity-induced growth reduction differed substantially among accessions. Salt tolerant accessions showed better control over gas exchange properties, exhibited higher tissue tolerance, and retained higher potassium ion content despite higher sodium ion accumulation in leaves. Wild rice species showed relatively lower and steadier xylem sap sodium ion content over the period of 3 weeks analysed, suggesting better control over ionic sodium xylem loading and its delivery to shoots with efficient vacuolar sodium ion sequestration. Contrary to this, saline sensitive genotypes managed to avoid initial Na+ loading but failed to accomplish this in the long term and showed higher sap sodium ion content. Conclusively, our results suggest that wild rice genotypes have more efficient control over xylem sodium ion loading, rely on tissue tolerance mechanisms and allow for a rapid osmotic adjustment by using sodium ions as cheap osmoticum for osmoregulation.

Item Details

Item Type:Refereed Article
Keywords:rice, salinity
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Agrochemicals and biocides (incl. application)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Rice
UTAS Author:Shahzad, B (Mr Babar Shahzad)
UTAS Author:Yun, P (Mr Ping Yun)
UTAS Author:Shabala, L (Associate Professor Lana Shabala)
UTAS Author:Zhou, M (Professor Meixue Zhou)
UTAS Author:Shabala, SN (Professor Sergey Shabala)
ID Code:153047
Year Published:2022
Web of Science® Times Cited:3
Deposited By:TIA - Research Institute
Deposited On:2022-09-02
Last Modified:2022-11-18
Downloads:2 View Download Statistics

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