烟草青枯病抗性主基因分析

Major Gene Analysis of Resistance to Tobacco Bacterial Wilt

通过了解烟草青枯病抗性的主基因遗传及效应,为制定抗性育种方案提供依据。选用青枯病抗感亲本配制组合19份F2世代材料,于2010年在烟草青枯病病圃进行抗性鉴定,利用混合遗传软件（一步法）分析其主基因的遗传。结果表明：烟草青枯病抗性遗传存在主基因,且符合2对主基因控制的加性-显性-上位性遗传模型（即B-1模型）或加性-显性模型（即B-2模型）。主基因遗传率在52%~97%之间。各主基因型效应值大小顺序为：AABB≥AABb≥AAbb≥AaBB≥AaBb≥Aabb≥aaBB≥aaBb≥aabb,主基因间存在互作效应。

In order to provide evidence for resistance breeding scheme, the major gene of resistance to tobacco bacterial wilt was analyzed. The individual plants of 19 tobacco F2 populations were identified in disease field of Anhui Province in China in 2010 and mixed inheritance model（single-step-method） was used. The results showed that the inheritance of the resistance to tobacco bacterial wilt accorded with the major genes model which was additivedominant- epistasis model（B-1 model） or additive- dominant model（B-2 model）. The value of generalization heritability of major genes was among 52%-97%. The effect value order of major gene types was AABB ≥ AABb ≥ AAbb ≥ AaBB ≥ AaBb ≥ Aabb ≥ aaBB ≥ aaBb ≥ aabb. The epistasis effect was existed among major genes.