| In order to explore the QTLs related to spike traits in wheat,a set of wheat immortalized F2 population with 232 hybrid combinations was constructed based on 73 DH population derived from a cross between the common wheat BS366 and Baiyu 49.A high-density genetic map was constructed based on 90K SNP chip,and QTLs for spike length(SL),spikelet number(SN),kernel number(KN) and thousand-kernel weight(TKW)in two different environments were mapped.A total of 8 726 SNP were used to construct genetic map of 19 533 cM with the average distance of 2.24 cM between markers.8 726 SNP markers were combined to 3 078 BIN markers,1 283(41.7%) SNPs were found in A genome(41.7%),1 188(38.6%) in B genome,and only 607(19.7%) in D genome.96 QTLs were detected on 19 chromosomes except chromosomes 3B and 6B.Among them,20,59,6 and 11 QTLs for spike length,spikelet number,kernel number and thousand-kernal weight were identified,respectively.A single QTL explained 0.15%-12.34% of the phenotypic variation.The additive effect of 51 QTLs was positive,indicating that the additive effect was from the female parent BS366,and the additive effect of 45 QTLs was negative,indicating that the additive effect was from the male parent Baiyu 149.The probability of variation explained of 23 QTLs was more than 5%,and they were identified as the main QTLs. |
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