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Linking osmotic adjustment and stomatal characteristics with salinity stress tolerance in contrasting barley accessions

Citation

Zhu, M and Zhou, M and Shabala, L and Shabala, S, Linking osmotic adjustment and stomatal characteristics with salinity stress tolerance in contrasting barley accessions, Functional Plant Biology, 42, (3) pp. 252-263. ISSN 1445-4408 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 CSIRO

DOI: doi:10.1071/FP14209

Abstract

Salinity tolerance is a complex trait – both physiologically and genetically – and the issue of which mechanism or trait has bigger contribution towards the overall plant performance is still hotly discussed in the literature. In this work, a broad range of barley (Hordeum vulgare L. and Hordeum spontaneum L.) genotypes contrasting in salinity stress tolerance were used to investigate the causal link between plant stomatal characteristics, tissue ion relations, and salinity tolerance. In total, 46 genotypes (including two wild barleys) were grown under glasshouse conditions and exposed to moderate salinity stress (200 mM NaCl) for 5 weeks. The overall salinity tolerance correlated positively with stomata density, leaf K+ concentration and the relative contribution of inorganic ions towards osmotic adjustment in the shoot. At the same time, no correlation between salinity tolerance and stomatal conductance or leaf Na+ content in the shoot was found. Taken together, these results indicate the importance of increasing stomata density as an adaptive tool to optimise efficiency of CO2 assimilation under moderate saline conditions, as well as benefits of the predominant use of inorganic osmolytes for osmotic adjustment in barley. Another finding of note was that wild barleys showed rather different strategies dealing with salinity, as compared with cultivated varieties.

Item Details

Item Type:Refereed Article
Keywords:barley, salinity, inorganic osmolytes, organic osmolytes, potassium, stomatal conductance, stomatal density, sodium
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:Zhou, M (Professor Meixue Zhou)
Author:Shabala, L (Dr Lana Shabala)
Author:Shabala, S (Professor Sergey Shabala)
ID Code:97582
Year Published:2015
Web of Science® Times Cited:11
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2014-12-24
Last Modified:2017-11-06
Downloads:0

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