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春小麦品种Lemhi中有1个基因,品种Lee、Compair和Fielder各有2个基因,每个基因能抗由Pucciniastriformis引起的条锈病.为了确定这些基因的染色体位置,将这些品种同感病的二倍体中国春(ChineseSpring)小麦及一套非整倍体的中国春小麦杂交.单体的F_1植株由细胞学确定,在温室中生长并且自交以产生F_2种子,F_2幼苗连同亲本用选择的北美条锈菌接种。结果证明:Fielder中的Yr_6是在7B染色体上,Compair中的Yr_8是在染色体2D上,又指出Lemhi品种中的Yr_(lem)是在染色体1B上;Lee中的Yr(Lel)是在5D染色体上,Yr_(le2)是在6D上;Compair中的Yrcom在染色体5B上及Fielder中的Yr_(Fie)在6D上。用北美条锈小种测试检查不出Lee中的基因Lr_7。作者建议正式命名Yrcom为Yr_(19),Yr_(Fie)为Yr_(20),Yr_(Lem)为Yr_(21),Yr_(Lel)为Yr_(22),Yr_(le2)为Yr_(23)。
The spring wheat cultivar Lemhi has one gene, and the varieties Lee, Compair and Fielder each have two genes, each of which is resistant to stripe rust caused by Pucciniastriformis. To determine the chromosomal location of these genes, these varieties were crossed with the susceptible diploid Chinese Spring wheat and a set of aneuploid Chinese spring wheat. Monomeric F_1 plants were cytologically identified, grown in the greenhouse and selfed to produce F_2 seeds, and F_2 seedlings, along with their parents, were inoculated with the selected North American stripe rust. The results show that Yr_6 in Fielder is on chromosome 7B, Yr_8 in Compair is on chromosome 2D, and Yr_ (lem) in Lemhi is on chromosome 1B; Yr (Lel) in Lee is on chromosome 5D , Yr_ (le2) is on 6D; Yrcom on Compair is 6D on chromosome 5B and in Fielder. The gene Lr_7 in Lee was not detected with the North American stripe rust test. The author suggests that Yrcom be formally named Yr_ (19), Yr_ (Fie) be Yr_ (20), Yr_ (Lem) be Yr_ (21), Yr_ (Lel) be Yr_ (22), Yr_ (le2) be Yr_ .