Identification of a Stable Quantitative Trait Locus for Percentage Grains with White Chalkiness in Rice (Oryza sativa)

查看全文 作　　者：Tao [1]Guo;Xiaolu [2]Liu;Xiangyuan [1]Wan;Jianfeng [1]Weng;Shijia [1]Liu;Xi [1]Liu;Mingjiang [1]Chen;Jingjing [1]Li;Ning [2]Su;Fuqing [2]Wu;Zhijun [2]Cheng;Xiuping [2]Guo;Cailin [2]Lei;Jiulin [2]Wang;Ling [1]jiang;Jianmin [1,2]Wan

机构地区：[1]Key-Laborato'ry of Crop Genetics and Germplasm Enhancement/Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural University, Nanjing 210095, China;[2]Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China

出　　处：《Journal of Integrative Plant Biology》索引2011年第53卷第8期,共10页

基　　金：supported by the National Natural Science Foundation of China(30771325);National Key Transform Program(2008ZX08001-06);the earmarked fund for Modern Agro-industry Technology Research System;Jiangsu Cultivar Development Program(BE2008354 and BE2009301-3);the 111 project 摘　　要：High chalkiness is a major problem in many rice-producing areas of the world, especially in hybrid rice (Oryza sativa L.) in China. We previously showed a major quantitative trait locus for the percentage of grains with white chalkiness (QTLqPGWC-8) in the interval G1149-R727 on chromosome 8 using a chromosome segment substitution line (CSSL). Here, we selected the line-CSSL50 harboring the QTLqPGWC-8 allele from the CSSLs derived from a cross between Asominori (as a recurrent parent) and IR24 (as a donor parent), which had higher percentage chalkiness, markedly different from that of Asominori. There were also significant differences in starch granules, appearance of amylose content (AAC) and milling qualities between Asominori and CSSL50, but not in grain size or thousand grain weight (TGW). The BC4F2 and BC4F3 populations from a cross between CSSL50 and Asominori were used for fine mapping of qPGWC-8. We narrowed down the location of this QTL to a 142 kb region between Indel markers 8G-7 and 8G-9. QTLqPGWC-8 accounted for 50.9% of the difference in PGWC between the parents. The markers tightly linked to qPGWC-8 should facilitate cloning of the gene underlying this QTL and will be of value for marker-assisted selection in breeding rice varieties with better grain quality. 关键词：数量性状位点 ORYZA 水稻生产垩白度分子标记辅助选择鉴定稳定直链淀粉含量

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Identification of a Stable Quantitative Trait Locus for Percentage Grains with White Chalkiness in Rice (Oryza sativa)

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