Water uptake dynamics under progressive drought stress in diverse accessions of the OryzaSNP panel of rice (Oryza sativa)
Veeresh R. P. Gowda A B , Amelia Henry A E , Vincent Vadez C , H. E. Shashidhar B and Rachid Serraj A D
+ Author Affiliations
- Author Affiliations
A International Rice Research Institute, DAPO Box 7777, Metro Manila 1301, Philippines.
B Department of Biotechnology, College of Agriculture, University of Agricultural Sciences, GKVK, Bangalore 560065, India.
C International Crops Research Institute for the Semiarid Tropics, Patancheru, Hyderabad, Andra Pradesh, India.
D Present address: International Centre for Agricultural Research in the Dry Areas, Aleppo, Syria.
E Corresponding author. Email: a.henry@irri.org
Functional Plant Biology 39(5) 402-411 https://doi.org/10.1071/FP12015
Submitted: 19 January 2012 Accepted: 16 March 2012 Published: 27 April 2012
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.
Additional keywords: genotypes, lowland soil, lysimeter, root.
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