辽宁丹东地区稻瘟病菌生理小种的研究

 用两套鉴别品种,即中国鉴定品种和日本的清泽品种,对丹东地区水稻瘟病菌小种进行鉴定。用中国品种把80个单孢分离菌分成12个小种,用清泽品种将83个单孢分离菌分出成34个小种。当地优势小种是日本的307小种和中国的ZF₁小种。在丹东现在明确了病菌侵染的抗病基因是Pi-ta²。
高抗又高产的品种中花8号和中花9号,对多数小种是高抗的,但对日本小种577.3和577.7易感染。这两个小种在丹东地区出现的频率较低,因此中花8号和中花9号这两个品种在1-2年之内,不会丧失抗性。

ON PATHOGENIC RACES OF PYRICUIARIA ORYZAE IN DANDONG REGION

Pathogenic races of Pyricularia oryzae in Dandong region were tested using two sets of differential varieties,Kiyosawa,s differential varieties and Chinese differential varieties.In this paper,83 monosporous isolates were divided into 34 pathogenic races by kiyosawa,s differential varieties and 80 monosporous isolates into 12 pathogenic races by Chinese differential varieties.Dominant races are Japanese race 307.0 and Chinese nace ZF₁.All known resistance genes identifie up aate,except pi-ta²,are invaded by pathogenic races.Strains which infect Tetep and Zhenglong 13 in Chinese differential varieties exist in Dandong region.
High-yielding and resistant varieties Zhonghua No.8 and Zhonghua No.9,which were developed by Pollen culture,have high resistance to most of pathogenic races,but they are infected by races 577.3 and 577.7.These two races have low distribution frequency in Dandong region.Therefore,the resistance of these two varieties,Zhonghua No.8 and Zhonghua No.9.cannot be broken down in one or two years.