QTL Mapping for Kernel Related Traits Using Sweet Corn F2∶3 Populations
The kernel size and weight are important components of maize yield,and kernel size significantly im-pacts visual quality in maize as well.In this study,QTL of kernel length,kernel width,kernel diameter and 100-kernel weight were mapped using F2∶3 population derived from sweet corn inbred lines SHL03 and SHL01 as parents.A total of 35 relevant QTLs were located on 10 chromosomes of maize,including 5 QTLs for 100-kernel weight and 30 QTLs for kernel size,which explained 2.44％to 12.2％of the phenotypic variation.Three major QTL,qKD10,qHKW7 and qKW6,were interpreting 11.44％,12.2％,and 10.15％of phenotypic variation,respec-tively.Genome segments controlling different traits were detected in the same regions on 3,6,9,and 10 chromo-somes.According to expression profile analysis and functional annotation,a total of 27 candidate genes were found on the confidence intervals of major QTL.It was predicted that maize genes Zm00001d023994,Zm00001d035561,Zm00001d024027,Zm00001d020325,Zm00001d020374,Zm00001d020311,and Zm00001d020409 would be in-volved in formation of kernel size.The research results provide certain assistance for the genetic research and molecular marker-assisted breeding of sweet corn kernel size and 100-kernel weight traits.
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