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JXB Advance Access published online on September 9, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erg243
© 2003 by Oxford University Press
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Received December 30, 2002; accepted June 18, 2003
© 2003 Society for Experimental Biology

RESEARCH PAPER

Mapping of QTLs associated with cold tolerance during the vegetative stage in rice

V. C. Andaya 1 and D. J. Mackill 2*

1 Department of Agronomy and Range Science, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
2 Plant Breeding, Genetics and Biochemistry Division, International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines

* To whom correspondence should be addressed. E-mail: d.mackill{at}cgiar.org.


  Abstract

Low-temperature stress is an important factor affecting the growth and development of rice (Oryza sativa L.) in temperate and high-elevation areas. Cold stress may cause various seedling injuries, delayed heading and yield reduction due to spikelet sterility. In this study, 181 microsatellite marker loci were used to identify quantitative trait loci (QTLs) associated with cold tolerance at the vegetative stage in 191 recombinant inbred lines (RILs) derived from a cross of a cold-tolerant temperate japonica cultivar (M-202) with a cold-sensitive indica cultivar (IR50). Different temperature regimes were applied in growth chambers on 191 RILs. The temperature regimes imposed in the growth chamber simulated cold-stress injuries at the seedling and late vegetative stages. In this study a major QTL was identified on chromosome 12, designated as qCTS12a, that was closely associated with cold-induced necrosis and wilting tolerance, and accounted for 41% of the phenotypic variation. A number of QTLs with smaller effects were also detected on eight rice chromosomes.

Key words: Abiotic stress, cold tolerance, QTL mapping, rice.


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