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### Inheritance analysis and QTL mapping of main stem height and lateral branch length in peanut (Arachis hypogaea L.)

1. Industrial Crops Research Institute, Henan Academy of Agricultural Sciences, Peanut Subcenter of the National Center for Oil Crops Improvement Zhengzhou Henan Provincial Key Laboratory for Oil Crops Improvement, Key Laboratory of Oil Crops in Huanghuaihai Plains, Ministry of Agriculture ,Zhengzhou 450002, China
• Online:2013-10-28 Published:2014-01-17

Abstract:

Main stem height and lateral branch length of peanut are two important traits controlling plant shape. Recombinant inbred lines (RILs, Zheng9001×Zheng8903) were planted in Sanya, Hainan Province and Yuanyang, Henan Province. Main stem height and lateral branch length in the two environments were analyzed with mixed major gene and polygene inheritance model. Composite Interval Mapping (CIM) implemented in WinQTLcart2.5 was used to identify QTL of these two traits. The results indicated that the genetic models of both traits in Hainan were consistent with model C (C-0), the multi-gene genetic model with multiple gene effects and environmental effects, and the polygenic heritability of main stem height and branch length were 46.18% and 50.14% respectively. The genetic model of main stem height in Yuanyang was consistent with model E-1-0, two additive epistatic major genes-additive epistatic polygene model, and the genetic heritability of major genes and polygene were 45.49% and 21.98% respectively. The genetic model of branch length in Yuanyang was the same as that in Sanya, and the genetic heritability was 88.19%. Four and six QTL controlling main stem height were detected based on the phenotypic data collected in Sanya and Yuanyang respectively, and their phenotypic variance was 5.81%-18.00%. Five and eight QTL controlling branch length were detected based on data collected in Sanya and Yuanyang respectively, and their phenotype variance was 5.61%~25.12%. Based on the present study, it could be concluded that main stem height and branch length were controlled by polygene, which should be taken into account in the genetic improvement of plant shape.