Mapping QTL of Fiber Yield and Quality Traits in F2 Populations of Chromosome Segment Substitution Lines from Gossypium hirsutum × Gossypium barbadense |
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| Authors: | Guo Lixue Shi Yuzhen Li Junwen Gong Juwu Liu Aiying Shang Haihong Gong Wankui Chen Tingting Ge Qun Sun Jie Yuan Youlu |
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| Institution: | 1. Shihezi University, College of Agriculture / The Key Laboratory of Oasis Eco-agriculture of Xingjiang Production and Construction Group, Shihezi, Xinjiang 832003, China; 2. Institute of Cotton Research of CAAS / State Key Laboratory of Cotton Biology / Key Laboratory of Biological and Genetic Breeding of Cotton, Ministry of Agriculture, Anyang, Henan 455000, China |
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| Abstract: | In this study, F2 populations from two chromosome segment substitution lines MBI7455 and MBI7358, were quantified using SSR to evaluate the parents' genotype and detect QTL related to fiber quality plus yield traits of cotton. Results show that the recurrent parent (CCRI45) hosted 96.70% and 95.60% of chromosome segment substitution in MBI7455 with 12 chromosome segments and in MBI7358 with 16 chromosome substitution segments of Gossypium barbadense, respectively. In the F2 population, the average rate of chromosome substitution of the recurrent parent (CCRI45) was 96.44%, and the average segments of chromosome substitution of Gossypium barbadense was 13.42, with an average segments of homozygous donor chromosome value of 3.90. Analysis showed 19 fiber quality-related QTL with a phenotypic variance of between 2.52%-13.11% and seven yield traits-related QTL with a range of 2.93%-11.40% phenotypic variance, resulting in a total of 26 QTL. The CSSLs could be used to detect QTL for fiber yield and quality traits, which offer an important foundation for the cotton molecular-assisted breeding. |
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| Keywords: | cotton chromosome segment substitution lines QTL fiber quality |
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