关键词: 小麦, 骨干亲本, 染色体位点, 选择, 关联分析

Abstract:

【Objective】 The main objective is to uncover the genetic contribution of founder parent to its offspring through tracking chromosomal regions of Orofen in its progeny. 【Method】 Orofen and its 23 representative progenies were analyzed using morphological traits in five environments and microsatellite markers. 【Result】 The frequencies of the alleles which were amplified in Orofen but absent in other 4 parental accessions (Jinan 4, Beijing 8, 54405 and Heine Hvede) at 43 SSR loci were higher than the theoretical ratio 0.38 in the first generation; the frequencies of the alleles which were amplified in Orofen but absent in other 6 parental accessions (Jinan 4, Beijing 8, 54405, Heine Hvede, Lovrin 10 and Lovrin 18) at 41 SSR loci were higher than the theoretical ratio 0.18 in the second generation; at twenty-one of the found loci above, the unique alleles amplified only in Orofen have been selected continuously in the both generations. Association mapping indicated that the alleles according to Orofen which occurred in most progenies at the loci Xwmc710, Xbarc235 and Xbarc252 were associated with higher grain number and yield when compared with the remaining amplified alleles at the same loci. 【Conclusion】 It was speculated that the genomic region detected and associated traits played an important role for the improvement of wheat in China and could be acted as the emphases for further study.

Key words: wheat, founder parent, chromosomal loci, selection, association mapping