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Identification of Quantitative trait Loci for Grain traits in Japonica Rice

Agricultural Sciences in China 2010年第7期9卷 929-936页

作者： LI Mao-mao XU Lei REN Jun-fang CAO Gui-lan YU Li-qin HE Hao-hua HAN Long-zhi KohHee-jong Institute of Crop Sciences Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement （NFCRI） Beijing 100081 P.R. China College of Agronomy Jiangxi Agricultural University Nanchang 330045 P.R.China Rice Research institute Jiangxi Academy of Agricultural Sciences Nanchang 330200 P.R.China School of Plant Science College of Agriculture and Life Science Seoul National University Seoul 151-921 Korea

Quantitative trait loci（QTLs） of grain traits were detected to provide theoretical basis for fine mapping and molecular marker-assisted breeding of grain traits in japonica *** an F2 population including 200 individuals derived from a cross combination between two japonica rice DL115 with large grain and XL005 with small grain,the grain length,grain width,grain thickness,ratio of grain length to width and 1 000-grain weight were evaluated in Beijing;and the quantitative trait loci for above five grain traits were identified by composite interval mapping using SSR *** results showed that the five grain traits exhibited a normal continuous distribution in F2 population,indicating they were quantitative traits controlled by multiple genes.A total of 16 QTLs conferring the five grain traits were detected on chromosomes 2,3,5 and 12,*** QTLs,namely qGL3a,qGW2,qGW5,qGT2,qRLW2,qRLW3,qGWT2 and qGWT3,were major QTLs and explained 15.42,40.89,13.54,33.43,13.82,13.61,12.51 and 10.1% of the observed phenotypic variance,*** them,qGW2,qGT2,qRLW2 and qGWT2 were mapped in same interval RM12776-RM324 on chromosome *** marker interval RM12776-RM324 on chromosome 2 was common marker intervals of four major QTLs,and the two SSR markers RM12776 and RM324 would be used in molecular markerassisted breeding in japonica *** modes of gene action were mainly additive and partial *** QTLs＇ alleles were derived from small grain parent XL005,and other 12 QTLs＇ alleles were derived from large grain parent *** alleles from larger parent were showed significant effects to grain length,grain width,grain thickness and 1 000-grain weight.

关键词： japonica rice drain trait SSR marker quantitative trait locus gene action

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