小麦新品种陕农33的遗传构成分析

为解析小麦新品种陕农33的遗传构成,利用小麦55K芯片检测到的53 063个SNP标记分析双亲陕农981和新麦18对陕农33的遗传贡献率。结果表明,陕农33与亲本陕农981和新麦18 SNP标记的一致性分别为52.72%和46.38%,陕农981对陕农33的贡献略大于新麦18;从染色体水平看,新麦18对陕农33的贡献率超过50%的染色体有2A、5A、7A、3B、4B、2D、3D、4D和6D,而陕农981在除此之外的12条染色体的遗传贡献率均大于50%;在遗传距离大于5 cM的染色体区段中,陕农33来源于陕农981和新麦18的染色体区段分别有18个和19个,其中,在6B染色体上来源于陕农981的染色体区段最多(4个),在7A染色体上来源于新麦18的区段最多(6个);陕农33有154个不同于双亲的特异位点,分布在21条染色体上,其中,在1B、2B、2D、4A、4D和6A染色体上,共发现11个与农艺和品质性状有关的QTL,3个来源于新麦18,8个来源于陕农981。

Dissection of Genetic Components in the New High-Yielding Wheat Cultivar Shaannong 33

In this study,the genetic contributions of the parents(Shaannong 981 and Xinmai 18) were tested using 53 063 SNP markers,to investigate the genetic of a new wheat variety Shaannong 33. The results showed that Shaannong 981(52.72%) contributed more to Shaannong 33 than Xinmai 18 (46.38%) on the entire genome level.As for single chromosome,more than 50% of the contribution rate from the chromosomes 2A,5A,7A,3B,4B,2D,3D,4D and 6D of Xinmai 18 can be detected in Shaannong 33. Whereas the genetic contribution of Shaannong 981 to the remining 12 chromosomes is greater than 50%. In the chromosome segment with genetic distance greater than 5 cM,Shaannong 33 originated from the 18 and 19 chromosome fragments of Shaannong 981 and Xinmai 18,respectively. Among them,the chromosomes derived from Shaannong 981 and Xinmai 18 have the most fragments on chromosome 6B and 7A,respectively. Shaannong 33 contains 154 specific sites differing from its parents across 21 chromosomes. Three QTLs derived from Xinmai 18 and eight QTLs derived from Shaannong 981 related to agronomic and quality traits were detected on chromosomes 1B,2B,2D,4A,4D and 6A.