Genetic mapping of quantitative trait loci for fiber quality and yield trait by RIL approach in Upland cotton |
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| Authors: | Xinlian Shen Wangzhen Guo Qiongxian Lu Xiefei Zhu Youlu Yuan Tianzhen Zhang |
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| Institution: | (1) National Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, P.R. China |
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| Abstract: | The improvement of cotton fiber quality has become more important because of changes in spinning technology. Stable quantitative
trait loci (QTLs) for fiber quality will enable molecular marker-assisted selection to improve fiber quality of future cotton
cultivars. A simple sequence repeat (SSR) genetic linkage map consisting of 156 loci covering 1,024.4 cM was constructed using
a series of recombinant inbred lines (RIL) developed from an F2 population of an Upland cotton (Gossypium hirsutum L.) cross 7235 × TM-1. Phenotypic data were collected at Nanjing and Guanyun County in 2002 and 2003 for 5 fiber quality
and 6 yield traits. We found 25 major QTLs (LOD ≥ 3.0) and 28 putative QTLs (2.0 < LOD < 3.0) for fiber quality and yield
components in two or four environments independently. Among the 25 QTLs with LOD ≥ 3, we found 4 QTLs with large effects on
fiber quality and 7 QTLs with large effects on yield components. The most important chromosome D8 in the present study was
densely populated with markers and QTLs, in which 36 SSR loci within a chromosomal region of 72.7 cM and 9 QTLs for 8 traits
were detected. |
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| Keywords: | Gossypium hirsutum RIL QTL Fiber quality Yield Molecular mapping |
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