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从菲律宾各地采集稻瘟病菌(Pyricula-riaoryzae),并在菲律宾广泛种植的品种和国际的、日本的以及南朝鲜的鉴别品种上进行测定。从低洼地大面积种植品种采集标样分离出来的菌株通常对菲律宾IR品种具致病性,但在来自种植旱稻的Zamboanga delsur地区的分离菌株中,很少有致病性。在Zamboangadel Sur的菌株对C22的致病频率最高。很少对IR56、UPLRi3和UPLRi5品种致病。在病原群体中存在对新投放品种IR58,IR60和IR62的致病小种。1R60和lR62表现中间反应型的频率比其它1R品种高。三套鉴别
Pyricula-riaoryzae was collected from various parts of the Philippines and was tested on widely cultivated varieties in the Philippines and on international, Japanese and South Korean discriminating cultivars. Strains isolated from standard samples collected from low-lying large-area cultivars are usually pathogenic to the IR cultivars in the Philippines, but seldom have pathogenicity in isolates from the Zamboanga delsur area where upland rice is planted. Strains in Zamboangadel Sur had the highest incidence of C22. Little is known about the IR56, UPLRi3 and UPLRi5 varieties. Pathogenic populations present pathogenic races for the newly introduced varieties IR58, IR60 and IR62. 1R60 and lR62 show the intermediate reaction frequency higher than other 1R varieties. Three sets of identification