Genetic mapping and quantitative trait locus analysis of fiber quality traits using a three-parent composite population in upland cotton (Gossypium hirsutum L.) |
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Authors: | Ke Zhang Jian Zhang Jing Ma Shiyi Tang Dajun Liu Zhonghua Teng Dexin Liu Zhengsheng Zhang |
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Institution: | (1) Key Laboratory of Biotechnology & Crop Quality Improvement, Ministry of Agriculture/College of Agronomy & Biotechnology, Southwest University, 400716 Chongqing, People’s Republic of China; |
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Abstract: | Composite cross populations (CP) developed from three or more cultivars/lines are frequently used to improve agronomic and
economic traits in crop cultivar development programs. Employing CP in linkage map construction and quantitative trait locus
(QTL) mapping may increase the marker density of upland cotton (Gossypium hirsutum L.) genetic maps, exploit more adequate gene resources and facilitate marker-assisted selection (MAS). To construct a relatively
high-density map and identify QTL associated with fiber quality traits in upland cotton, three elite upland cultivars/lines,
Yumian 1, CRI 35 and 7,235, were used to obtain the segregating population, Yumian 1/CRI 35//Yumian 1/7,235. A genetic map
containing 978 simple sequence repeat (SSR) loci and 69 linkage groups was constructed; the map spanned 4,184.4 cM, covering
approximately 94.1% of the entire tetraploid cotton genome. A total of 63 QTL were detected, explaining 8.1–55.8% of the total
phenotypic variance: 11 QTL for fiber elongation, 16 QTL for fiber length, 9 QTL for fiber micronaire reading, 10 QTL for
fiber strength and 17 QTL for fiber length uniformity. The genetic map and QTL detected for fiber quality traits are promising
for further breeding programs of upland cotton with improved fiber quality. |
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