烟草抗青枯病突变体153-K的抗性遗传及与农艺性状的关系

烟草青枯病是一种细菌性病害，严重影响烟叶生产，筛选抗青枯病的烟草种质并解析其抗性遗传效应对指导抗病育种具有重要意义。本研究选用感病品种翠碧一号（CB-1）和抗青枯病突变体153-K为亲本，构建了F2群体，利用"主基因+多基因"混合遗传模型分析方法，研究其在安徽、福建两个病圃环境下的遗传效应，并对153-K青枯病抗性与农艺性状进行相关分析。结果表明，153-K在安徽病圃中的最优遗传模型为MX2-EEAD-AD，即2对等显性主基因+加性-显性多基因模型；153-K在福建病圃中最优遗传模型为MX2-ADI-AD，即2对加性-显性-上位性主基因+加性-显性多基因模型。相关分析结果表明，在安徽、福建两个病圃环境下，青枯病抗性与株高呈显著负相关；而与叶片数、节距、茎围相关性均不显著。

Analysis of Resistance Inheritance of 153-K to Bacterial Wilt and Its Correlation with Agronomic Characters in Tobacco

Tobacco bacterial wilt is a bacterial disease that seriously affects the production of tobacco in China. Screening for tobacco germplasm resistant to bacterial wilt and analyzing the genetic effects of resistance are of great significance for disease resistance breeding. In this study, the susceptible variety CB-1 and the bacterial wilt resistant mutant 153-K were selected as parents, and the F2 population was constructed. The analysis method of the mixed genetic model of "major gene + polygene" was used to study the genetic effects at two locations in Anhui and Fujian. The correlation analysis method was used to analyze the correlation between 153-K bacterial wilt resistance and agronomic traits. The results showed that the optimal genetic model of 153-K in Anhui is MX2-EEAD-AD, which means 2 equal dominant major genes + additive-dominant polygene model. The optimal genetic model in Fujian is MX2-ADI-AD, which means 2 pairs of additive-dominant-epistatic major gene + additive-dominant polygene model. The correlation analysis results showed that in Anhui and Fujian, resistance to bacterial wilt was significantly negatively correlated with plant height, but not significantly related with number of leaves, pitch distance, or stem circumference.