茄子青枯病抗性的遗传分析

Genetic Analysis of Resistance to Bacterial Wilt(Ralastonia solanacearum)in Eggplant(Solanum melongena L.)

选用 6个对青枯病具有不同抗性水平的茄子自交材料 ,按完全双列杂交设计 ,配制 36个组合(包含亲本自交 )。苗期人工接种鉴定各组合抗性并计算病情指数 ,采用Griffing方法Ⅰ及Hayman方法对抗性配合力方差进行分析 ,估计相关遗传参数。结果表明 ,茄子对青枯病的抗性遗传规律符合“加性—显性”效应模型。遗传效应中同时存在加性效应、显性效应和反交效应 ,但以加性效应为主。茄子对青枯病的抗病性表现隐性 ,感病性表现部分显性。茄子对青枯病的抗性遗传较为复杂 ,由多个微效基因、较少的主效基因和细胞质基因共同控制。

Six eggplant inbred lines with different resistance to bacterial wilt were used as parents in this experiment. The populations were evaluated for their reaction to bacterial wilt by artificial inoculation at the seedling stage. By using Griffing I and Hayman methods, a 6×6 diallel analysis was done to analyze the variance of the combining ability and estimate the genetic parameters. It was suggested that the inheritance of the resistance to bacterial wilt in the eggplant fit to the'additive-dominant'model, additive effect, dominant effect and reciprocal effect all played a role in the genetics of the resistance to bacterial wilt in eggplant, but the additive effect was the major. The resistance to bacterial wilt in eggplant was recessive and the susceptibility was partial dominant. The resistance to bacterial wilt in eggplant was controlled by a lot of minor genes, several major genes and cytoplasm genes.