番茄对细菌性斑点病的抗性遗传规律研究

Inheritance of Resistance to Bacterial Speck Disease in Tomato

利用细菌性斑点病的抗病番茄品种(红珍珠和美味樱桃)和感病品种(中蔬四号、美国大红樱桃和MR),通过常规田间抗感杂交、回交,接种病原菌鉴定子代的抗病性分离情况,统计分析的结果表明,杂交F_1代全部抗病,F_2代和BC_1代的抗感分离比分别符合3:1和1:1的理论分离比,说明了红珍珠和美味樱桃对番茄细菌性斑点病的抗病性为单基因显性遗传。

A study on inheritance of resistance to bacterial speck disease was carried out by conventional crossing between two resistant and three susceptible varieties of tomato. Resistance in F1, F2 or BC1 was identified by inoculations with bacterial of PST. All the Ft progeny is resistant to the disease. The resistance of F2 progeny was statistically consistent with the ratio of 3 to 1, and the BC1 progeny was accord with the ratio of 1 to 1. The results showed that a single dominant gene controlled the resistance in the two tomato varieties, Hong Zhen Zhu and Mei Wei Ying Tao.