小麦品种南麦660的遗传构成解析OACSTPCD

In order to clarify the molecular genetic basis of Nanmai 660,a new variety of good-quality weak gluten,wheat 55 K SNP chip was used to detect Nanmai 660 and its parents(3911 and M49)by molecular mark.The results showed that the genetic contribution rates of the parents 3911 and M49 to Nanmai 660 were quite different at the whole genome-wide level.The genetic contribution rate of 3911 to Nanmai 660 was 59.08%,which was higher than that of M49,with the contribution rate of 40.92%.The genetic contribution rate of 3911 to the A,B,and D genomes are 36.56%,72.85%,and 57.93%.The contribution rates of M49 to the A,B,and D genomes are 63.44%,27.15%,and 42.07%.The genetic con-tribution rate of maternal parent 3911 on chromosomes 7A,1B,2B,3B,4B,5B,7B,2D,3D,5D,and 7D is higher than that of M49,with genetic contribution rates on chromosomes 2B and 4B being 93.53%and 81.40%;The genetic contribution rate of male parent M49 on chromosomes 2A,4A,5A,6A,6B,1D,and 4D is higher than that of female parent 3911,with genetic contribution rates on chromosomes 4A and 1D being 94.15%and 82.11%.The analysis on the functional gene composition of important traits revealed that Nanmai660 not only polymerized six high thousand-grain weight genes TaGS2A1,TaGS2B1,TaGS5,TaGW2-6B,TaTGW7 and Tacwi,it also carried 1-feh W3,Lr34 genes and so on.This study provides a theoretical reference for the genetic improvement of a new high-quality weak gluten wheat variety Nanmai 660 at the molecular level.