Water uptake dynamics under progressive drought stress in diverse accessions of the OryzaSNP panel of rice (Oryza sativa)

    Gowda, V R P and Henry, A and Vadez, V and Shashidhar, H E and Serraj, R (2012) Water uptake dynamics under progressive drought stress in diverse accessions of the OryzaSNP panel of rice (Oryza sativa). Functional Plant Biology, 39 (5). pp. 402-411. ISSN 1445-4408

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    Abstract

    In addition to characterising root architecture, evaluating root water uptake ability is important for understanding drought response. A series of three lysimeter studies were conducted using the OryzaSNP panel, which consists of 20 diverse rice (Oryza sativa L.) genotypes. Large genotypic differences in drought response were observed in this genotype panel in terms of plant growth and water uptake. Total water uptake and daily water uptake rates in the drought-stress treatment were correlated with root length density, especially at depths below 30 cm. Patterns of water uptake among genotypes remained consistent throughout the stress treatments: genotypes that initially extracted more water were the same genotypes that extracted more water at the end of the study. These results suggest that response to drought by deep root growth, rather than a conservative soil water pattern, seems to be important for lowland rice. Genotypes in the O. sativa type aus group showed some of the greatest water uptake and root growth values. Since the OryzaSNP panel has been genotyped in detail with SNP markers, we expect that these results will be useful for understanding the genetics of rice root growth and function for water uptake in response to drought.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Uncontrolled Keywords: genotypes, lowland soil, lysimeter, root.
    Subjects: Others > Agriculture-Farming, Production, Technology, Economics
    Depositing User: Mr Sanat Kumar Behera
    Date Deposited: 10 Feb 2013 14:32
    Last Modified: 10 Feb 2013 14:32
    URI: http://oar.icrisat.org/id/eprint/6558
    Official URL: http://dx.doi.org/10.1071/FP12015
    Projects: Generation Challenge Program
    Funders: Bill and Melinda Gates Foundation
    Acknowledgement: Wethank J. Villa, G.Dimayugaand R. Torres for their technical assistance and K. L. McNally for his suggestions and coordinating the OryzaSNPproject.We thank the drought physiology team at ICRISAT for their valuable suggestions and help during Exp 2. We acknowledge the assistance from the Barwale Foundation, Hyderabad. This work was funded by the Generation Challenge Program (Project G3005.01) and the Bill and Melinda Gates Foundation project ‘Stress-Tolerant Rice for Africa and South Asia.’
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