关键词: 人工合成小麦, 多倍化, 选择压, 微卫星DNA, 遗传分化, 变异FONT

Abstract: Hybridization and polyploidization are important ways for wheat to evolve and to genetically differentiate. Ninety two simple sequence repeat (SSR) molecular markers, which distributed in A, B, and D genomes , were used to perform genetic comparison between Chuan-W5436 (CW5436), a new wheat variety, and its parents, synthetic hexaploid wheat Syn786 (♀ ) and common wheat Mianyang 26 (My26) (♂). The results indicated that alleles were not genetically transmitted from parents (Syn786 (♀) crossed (My26) (♂) ) to the progeny CW5436 as Mendelian proportions . A new variation on a SSR molecular marker loci with novel additive bands was observed in CW5436 but not found in its parents. It suggested that artificial selective stress was an important factor to promote the frequency of significant deviations of the expected allele, resulting in microsatellite sequences of the progeny changed . The affect of the genetic differentiation of SSR molecular marker loci that occurred in wheat crosses and gene transfer on the genetic evolu1tion of wheat was discussed.

Key words: Synthesized wheat