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KMID : 0578320110320060579
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Molecules and Cells
2011 Volume.32 No. 6 p.579 ~ p.587
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Quantitative Trait Loci for Cold Tolerance of Rice Recombinant Inbred Lines in Low Temperature Environments
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Jiang Wenzhu
Jin Yong-Mei
Lee Joo-Hyun
Lee Kang-Ie
Rihua Piao
Longzhi Han
Shin Jin-Chul
Jin Rong De
Tiehua Cao
Pan Hong-Yu
Xinglin Du
Koh Hee-Jong
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Abstract
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Low temperature is one of the major environmental stress-es in rice cultivation in high-altitude and high-latitude regions. In this study, we cultivated a set of re-combinant inbred lines (RIL) derived from Dasanbyeo (indica) / TR22183 (japonica) crosses in Yanji (high-latitude area), Kunming (high-altitude area), Chuncheon (cold water irrigation) and Suwon (normal) to evaluate the main effects of quantitative trait loci (QTL) and epistatic QTL (E-QTL) with regard to their interactions with environments for cold-related traits. Six QTLs for spikelet fertility (SF) were identified in three cold treatment locations. Among them, four QTLs on chromosomes 2, 7, 8, and 10 were validated by several near isogenic lines (NILs) under cold treatment in Chuncheon. A total of 57 QTLs and 76 E-QTLs for nine cold-related traits were identified as distributing on all 12 chromosomes; among them, 19 QTLs and E-QTLs showed significant interactions of QTLs and envi-ronments (QEIs). The total phenotypic variation explained by each trait ranged from 13.2 to 29.1% in QTLs, 10.6 to 29.0% in E-QTLs, 2.2 to 8.8% in QEIs and 1.0% to 7.7% in E-QTL ? environment interactions (E-QEIs). These results demonstrate that epistatic effects and QEIs are important properties of QTL parameters for cold tolerance at the reproductive stage. In order to develop cold tolerant varieties adaptable to wide-ranges of cold stress, a strategy facilitating marker-assisted selection (MAS) is being adopted to accumulate QTLs identified from different environments.
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KEYWORD
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cold tolerance, near isogenic line, quantitative trait loci, rice, RIL
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