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Understanding physiological and morphological traits contributing to drought tolerance in barley

Citation

Hasanuzzaman, M and Shabala, L and Brodribb, TJ and Zhou, M and Shabala, S, Understanding physiological and morphological traits contributing to drought tolerance in barley, Journal of Agronomy and Crop Science, 205, (2) pp. 129-140. ISSN 0931-2250 (2019) [Refereed Article]

Copyright Statement

© 2018 Blackwell Verlag GmbH

DOI: doi:10.1111/jac.12307

Abstract

Drought stress is a major limiting factor for crop production in the arid and semi‐arid regions. Here, we screened eighty barley (Hordeum vulgare L.) genotypes collected from different geographical locations contrasting in drought stress tolerance and quantified a range of physiological and agronomical indices in glasshouse trails. The experiment was conducted in large soil tanks subjected to drought treatment of eighty barley genotypes at three‐leaf stage and gradually brought to severe drought by withholding irrigation for 30 days under glasshouse conditions. Also, root length of the same genotypes was measured from stress‐affected plants growing hydroponically. Drought tolerance was scored 30 days after the drought stress commenced based on the degree of the leaf wilting, fresh and dry biomass and relative water content. These characteristics were related to stomatal conductance, stomatal density, residual transpiration and leaf sap Na, K, Cl contents measured in control (irrigated) plants. Responses to drought stress differed significantly among the genotypes. The overall drought tolerance was significantly correlated with relative water content, stomatal conductance and leaf Na+ and K+ contents. No significant correlations between drought tolerance and root length of 6‐day‐old seedling, stomatal density, residual transpiration and leaf sap Cl content were found. Taking together, these results suggest that drought‐tolerant genotypes have lower stomatal conductance, and lower water content, Na+, K+ and Cl contents in their tissue under control conditions than the drought‐sensitive ones. These traits make them more resilient to the forthcoming drought stress.

Item Details

Item Type:Refereed Article
Keywords:barley, drought, biomass, ionic relation, residual transpiration, root length, stomatal conductance, stomatal density
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Agro-ecosystem Function and Prediction
Objective Division:Plant Production and Plant Primary Products
Objective Group:Winter Grains and Oilseeds
Objective Field:Barley
UTAS Author:Hasanuzzaman, M (Mr Md Hasanuzzaman)
UTAS Author:Shabala, L (Associate Professor Lana Shabala)
UTAS Author:Brodribb, TJ (Professor Tim Brodribb)
UTAS Author:Zhou, M (Professor Meixue Zhou)
UTAS Author:Shabala, S (Professor Sergey Shabala)
ID Code:136231
Year Published:2019
Web of Science® Times Cited:1
Deposited By:Zoology
Deposited On:2019-12-09
Last Modified:2020-05-11
Downloads:0

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