Specialization of pathogenicity in Magnaporthe grisea

将采集自巴西地区小麦的稻瘟病菌分离株接种于多种禾本科植物上，确定其寄主范围。对隶属于9个部落的42种禾本科植物进行了植物反应和产孢势分析。来自小麦的菌株感染了五个部落的禾本科植物：hordae， festucae, Avencae， Chlorideae和Agrosteac，但不感染日本或巴西的低地和高地水稻品种。通过小麦和小谷子两种交配型的杂交，分析了交配型。16株小麦分离物中14株为MAT1-1, 1株为MAT1-2。通过将该小麦品系与其他禾本科植物品系杂交来测定其育性。该小麦菌株与青花葡萄（Eleusin coracana）、车前草（Brachiaria plantaginea）、意大利蛇尾草（Setaria italica）和其他小麦分离株杂交后产生成熟子囊孢子。虽然有一株水稻菌株能够侵染小麦幼苗和穗部，但主小麦菌株与水稻菌株不同，与Eleusine菌株相似。

Isolates Pyricularia grisea collected from wheat in regions of Brazil were inoculated on various gramincous plants to determine their host range. A set of 42 defferent gramincous plants belonging to nine tribes was analyzed by plant reactions and sporulation potential. The strain from wheat infected gramineous plants of five tribes : Hordeae, Festuccae, Avencae, Chlorideae, and Agrosteac, but not Japanese differential or Brazilian lowland and upland rice cultivars. Mating types were analyzed by crossing wheat and finger millet strains belonging to two mating types. Fourteen wheat isolates out of 16 were classified as MAT1-1, and one was MAT1-2. Fertility was determined by crossing the wheat strain with strains of other gramineous plants. Mature ascospores were produced when the wheat strain crossed with strains from Eleusin coracana, Brachiaria plantaginea, Setaria italica, and different wheat isolates. Although a rice strain was able to infect wheat seedlings and panicles experimentally, the main wheat strain was suggested to be different from the rice strain and similar to the Eleusine strain.