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把采集、分离自云南省 5个稻作区的 89个稻瘟病菌分生孢子单孢菌株及本实验分离的 2 80多个子囊孢子单孢菌株 ,共 10 8个生理小种 ,接种于当地 10个主栽水稻品种上。根据不同菌株在各个水稻品种上的毒力频率及品种两两配合后的联合致病系数 ,明确云粳 34号、云粳 42号、腾糯 2号、楚粳 17号抗瘟性较强。在 10 8个生理小种中 ,其毒力频率分别仅为 1 93%、2 75 %、9 43%和 16 76 % ,仍可在本省继续推广种植或作抗源使用 ;而合系 35、鹤 16、楚粳 3号、楚粳 14号、云粳 9号、云粳 136号的毒力频率值分别为 2 3 99%、2 5 88%、42 32 %、86 35 %、5 7 84%和 41 0 8% ,已不能在云南单一大面积推广种植。试验表明 ,在利用分生孢子菌株作抗性分析 ,同时辅助于子囊孢子 ,将可提高抗性分析的准确性
A total of 89 M. grisea isolates collected from 5 rice growing areas in Yunnan Province and 280 ascospore isolates isolated from this experiment were inoculated into the local 10 main rice varieties. According to the virulence frequency of different strains on each rice variety and the joint pathogenicity coefficient after the two varieties were combined, it was clear that the resistance of Yunjing 34, Yunjing 42, Tengnuo 2 and Chujing 17 was strong. In 10 8 races, the frequency of virulence was only 1 93%, 2 75%, 9 43% and 16 76%, respectively, and they could still be popularized or used as anti-source in this province. However, The virulence frequencies of Crane 16, Chujing 3, Chujing 14, Yunjing 9 and Yunjing 136 were 2399%, 2588%, 4232%, 8635% and 574% respectively % And 41 0 8%, can not be a single large-scale promotion of planting in Yunnan. Experiments have shown that the use of conidial strains for resistance analysis while supporting ascospores will improve the accuracy of resistance analysis