人工接种与疫区诱发条件下大豆对灰斑病的抗性及后代选择研究

大豆灰斑病菌具有较强的生理分化的特点, 不同地区及气候条件都会影响大豆灰斑病的发病程度. 本试验将两份相同的大豆杂交材料分别种植在哈尔滨人工接种条件下及阿城疫区自然诱发条件下, 比较不同鉴定条件下杂交后代及亲本的抗性表现、抗性遗传与选择效果. 结果表明, 气候因素对大豆灰斑病抗性表现的影响很大. 在任何条件下,

Inheritance of Resistance to Cercos pora so jina Hara and Progeny Selection under Artificial Inoculation and Natural Infection in Soybean

Owing to the high adaptability and variability of Cercospora sojina Hara, there are many different races existed together in the nature field. Five resistance susceptible crosses had been planted in Xiangfang Farm in Harbin (in artificial inoculation) and in Yagou Test Sit nearby Harbin (in nature infection) respectively, in order to study the inheritance and selection of resistance to Cercospora sojina Hara in the two places. The resistance of parents and F 2 populations were largely affected by the weather conditions due to the resistance differences between different years being much larger than that between different places. In any case, the resistance of F 1 was nearly entire dominant and, in F 2 populations, large amount of resistant and susceptive individuals superior to their parents were separated. The resistance got down as generation went up (from F 1 to F 4). Selection effects showed that the selection of F 2 individuals was effective for F 3 lines planted in Xiangfang. The distributions of F 3 populations showed that there was no difference between choosing F 2 groups of LTPG being 0 and 10. But in Yagou condition, it was entirely different between choosing F 2 plants of LTPG being 0 and 10 for F 3 populations and the best choice was LTPG being 0.