Working group session:
Germplasm and Genetic Stocks
Presentation type:
poster
Authors:
Shuwen, Zhang; Baoliang, Zhou
Presenter:
Shuwen, Zhang
Correspondent:
Baoliang, Zhou
Abstract:
Quantitative trait loci (QTL) mapping was the foundation of marker-assisted selection (MAS) for lint yield and fiber quality in cotton breeding. Boll-related traits have impact on yield and fiber quality. Here, detection of QTLs related to boll traits and fiber quality traits were was performed using intraspecific F2 and F2:3 populations of AQ × 08-10604 (Gossypium hirsutum L). Totally, 91 QTLs were mapped for 17 traits related to boll and fiber quality traits in F2 and F2:3 populations, 39 QTLs were significant. Six pairs of common QTLs were found, two pairs for boll coat weight (BCW) were found in the same or neighbored position on Chr. A10 and D1. Two pairs of QTLs for boll length (BL) were found in the neighbored position on Chr. A10 and A13 with a higher percentage of PV. Two pairs of QTLs for boll diameter (BD) were found in the neighbored position on Chr. A10 and D1. It can be speculated that BCW, BL and BD are three of the traits with a higher level of stability. Five QTL clusters for the same traits or different traits were also identified in Chr. A10 (2), A13, D1, D5. Total of 64 epistatic QTLs were detected, playing important rules in genetic variation for boll-related traits. Correlation analysis showed that significant positive correlation existed between seed yield and boll number per plant and between boll weight and BCW, BL, and BD. The results presented here will enhance the understanding of the genetic basis of boll-related traits and enable further MAS in upland cotton.