Scientia Agricultura Sinica ›› 2005, Vol. 38 ›› Issue (02): 217-221 .

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES •     Next Articles

Molecular Mapping of QTLs for Cold Tolerance at the

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  1. 中国农业科学院作物品种资源研究所
  • Received:2003-12-09 Revised:2004-05-28 Online:2005-02-10 Published:2005-02-10

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Abstract: The quantitative trait loci (QTLs) for cold tolerance at the bud bursting period (CTBP) were identified by using a F2:3 population including 200 lines derived from a cross of indica and japonica Milyang 23/Jileng 1. A molecular linkage map of 97 SSR markers was constructed by using interval mapping and covered a total length of 1357.3 cM with an average distance of 13.99 cM, between adjacent markers in rice genome. The CTBP of F3 lines was evaluated at 5℃, and the percentage of seedling stand after treated under low temperature at the bud bursting period was used as cold tolerance index for CTBP. A continuous distribution near to normal for CTBP was observed in F3 lines, CTBP is a quantitative trait which was controlled by some genes. Three QTLs on chromosome 2, 4 and 7 which are associated with CTBP were detected on location of RM6-RM240, RM273-RM303, RM214-RM11, respectively, which explained the range of the observed phenotypic variance from 11.5% to 20.5%. qCTBP4, which is detected on RM273-RM303 of chromosome 4, is explained 20.5% of the observed phenotypic variance. The effect of qCTBP4's allelic gene comes from Jileng1.

Key words: Rice, Cold tolerance at the bud bursting period (CTBP), Microsatellite marker, QTL

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