Specialization of pathogenicity in Magnaporthe grisea

从巴西地区小麦上采集的稻瘟病菌菌株接种于不同的禾本科植物上，以确定其寄主范围。对9个部落42种不同的禾本科植物进行了植物反应和产孢量分析。来自小麦的菌株感染了五个部落的禾本科植物：大麦、费斯塔卡、Avencae、氯亚科和Agrosteac，但不感染日本和巴西的差异水稻和旱稻品种。以属于两种交配型的小麦和谷子品系为材料，对其交配型进行了分析。16个小麦分离物中有14个属于MAT1-1，1个属于MAT1-2。通过将小麦品系与其他禾本科植物品系杂交来确定其育性。该小麦品系与狗尾草、植物臂尾轮虫、狗尾草和不同小麦菌株杂交，产生成熟的子囊孢子。虽然水稻品系能够侵染小麦幼苗和穗部，但小麦的主要品系与水稻品系不同，与Eleusine品系相似。

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.