粗山羊草抗条锈 (CYR32) 性状的遗传分析

12份粗山羊草材料成株期对中国条锈病新小种CYR32为免疫-高抗,1份为高感.为探讨抗病性遗传规律,组配成抗×感、抗×抗杂交组合.通过对抗×感以及杂交组合的F1、F2群体对CYR32条锈菌抗性表型的分析,结果显示,所有抗源亲本对条锈病抗性呈完全显性遗传, F2群体抗感分离比例为3∶1,条锈病的抗性受1对显性基因控制.抗×抗杂交组合F2均呈抗病性,推测12个抗病粗山羊草材料的抗病基因可能为同一对显性基因.

The study on the genetic regularity of the resistance to stripe rust (CYR32) in elite goat grasses

The 12 elite goatgrasses observed in this study were either resistant or immune to the stripe rust physiological strain, CYR 32. The genetic regularity of twelve goatgrass parents which were known to be resistant to (CYR 32) were surveyed by analyzing the F1 and F2 populations from both the crosses of resistantsusceptible parents and from cross combinations between resistant accessions. The results showed that in resistancesusceptible cross combinations plants were all either resistant or immune to CRY32 in the F1 population. While in the F2 populations, the segregation ratio of resistance plants and susceptible plants was 31, synchronously. This suggests that the resistance of twelve elite parents to CYR32 is completely controlled by one dominant gene. Allelism (analysis) of a resistant gene in the F2 population of the resistanceresistance cross combinations indicated that the resistance gene among resistant accession is the same one dominant gene.