小麦籽粒大小相关稳定QTL的初步定位OA

To explore more stable quantitative trait loci(QTLs)associated with wheat grain size,this study used the recombinant inbred line population derived from the cross between Yangmai 158 and Xifeng as the material.By integrating four consecutive years of multi-environment phenotypic data on grain area,grain length,grain width,and grain length-to-width ratio,together with genotypic information from a 55K single nucleotide polymorphism(SNP)chip,a mapping analy-sis was performed to identify stable QTLs associated with wheat grain size.A total of 16 stable QTLs were identified,including three,seven,four,and two QTLs significantly associated with grain area,grain length,grain width,and grain length-to-width ratio,respectively.These QTLs were distributed on the 2A,2D,3A,3D,4A,4B,4D,5A,5B and 5D chromosomes of wheat.A single QTL can explain 3.60％to 19.60％of phenotypic variations.Among them,QGA.jaas-3A,QGA.jaas-4B,QGA.jaas-4D,QGL.jaas-3D,QGL.jaas-4D,QGL.jaas-5B,QGW.jaas-2A,QGW.jaas-4B,QGW.jaas-4D,and QLWR.jaas-5D were newly discovered QTLs.These stable QTLs related to wheat grain size can provide assistance for marker-assisted selection or molecular design breeding of high-yield wheat in the middle and lower reaches of the Yangtze River wheat region.