Using three selected overlapping RILs to fine-map the yield component QTL on Chro.D8 in Upland cotton

文献类型： 外文期刊

第一作者： Chen, Hong

作者： Chen, Hong;Qian, Neng;Guo, Wangzhen;Zhang, Tianzhen;Song, Qingping;Li, Baocheng;Deng, Fujun;Dong, Cunguang

作者机构：

关键词： QTL fine-mapping;Yield components;RIL lines;Backcrossed progeny

期刊名称：EUPHYTICA （ 影响因子：1.895； 五年影响因子：2.181 ）

ISSN： 0014-2336

年卷期： 2010 年 176 卷 3 期

页码：

收录情况： SCI

摘要： Cotton yield improvement is vital to fulfill rising global demands. The identification of major quantitative trait loci (QTL) for yield components was helpful in molecular marker-assisted selection (MAS) to improve cotton yield. We previously identified a densely populated QTL region for fiber qualities and yield components on chromosome D8 (Chro.D8) of Upland cotton from a (7235 x TM-1)RIL. In the present study, to fine-map yield component QTLs, we chose three overlapped recombinant inbred lines (RILs) with different intervals included the yield component QTLs, and backcrossed each line with TM-1 to develop three large sized mapping populations. Phenotypic data for yield components were collected in Nanjing (JES/NAU) and Xinjiang (BES/XJ) in 2006 and 2007. Three simple sequence repeat (SSR) genetic linkage maps on chro.D8 were constructed using 907 individuals in (7TR-133 x TM-1)F(2) (Pop A), 670 in (7TR-132 x TM-1)F(2) (Pop B), and 940 in (7TR-214 x TM-1)F(2) (Pop C). Three stable QTLs for boll size, two for lint percentage and one for boll number per plant,were detected on chro.D8 following analysis of three RIL backcrossed F(2)/F(2:3) progeny at JES/NAU and BES/XJ although their cultivation practices differ greatly between these two cotton-growing regions. One QTL for boll number per plant exhibited a phenotypic variance (PV) of 5.6-10.1%, three QTLs for boll size exhibited 15.0-35.5% PV and two lint percentage QTLs exhibited 10.9-19.3% PV. Negative correlation between lint yield and fiber strength was confirmed.

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