Working group session:
Structural Genomics
Presentation type:
oral
Authors:
Liu , Renzhong; Hu, Yan; Zhang , Tianzhen
Presenter:
Hu, Yan
Correspondent:
Zhang , Tianzhen
Abstract:
Cotton agronomic traits including yield and yield-components are quantitatively inherited. To address problems of low heritability and high experimental error associated with the identification of quantitative traits, an immortalized F2 (IF2) population has been constructed by intercrosses between RILs derived from Xiangzamian 2 (G. hirsutum L.), the most widely cultivated cotton hybrid in F2 in China. Yield and yield-component traits were investigated using the immortalized F2 population. A total of 143 QTL were detected in four environments and the combined analysis, 23 of which can be detected in more than one environment, and 6 QTL were also identified in previous researches, showing high stability across environments and might be of special value for MAS program. More dominant than overdominant QTL were identified, indicating that both dominant and overdominant effects contributed to cotton heterosis while dominance might play a more important role in heterosis for cotton hybrid XZM2. Genetic analysis results showed that the contribution order of yield-components to lint yield was bolls/plant > boll weight > lint percentage, suggesting that bolls/plant could take precedence over other traits in cotton yield improvement.