小麦白粉病菌对温度不同敏感性菌株的寄生适合度研究

 利用离体叶片接种法，将12个对温度不同敏感性的小麦白粉病菌株分别在18℃和22℃条件下的流行组分（潜育期、侵染几率、单病斑累积产孢量和病斑日扩展面积）和寄生适合度进行了测定。结果表明，对温度不同敏感性菌株的流行组分在18℃和22℃条件下均存在显著性差异，且单病斑累积产孢量与病斑日扩展面积的相关性最高。各供试菌株在22℃条件下的寄生适合度均低于18℃条件下的寄生适合度。在两温度条件下，对温度低敏感性菌株平均寄生适合度高于对温度高敏感性菌株，特别是在较高温度下这种趋势更为明显。

Parasitic fitness of Blumeria graminis f.sp.tritici isolates with different sensitivity to temperature

The epidemic components(latent period,infection probability,lesion cumulative sporulation and lesion daily-expansion area) and the parasitic fitness of 12 isolates of wheat powdery mildew(Blumeria graminis f.sp.tritici) with different sensitivity to temperature were tested by detached leaf segment method under 18℃ and 22℃ temperature conditions,respectively.The results showed that there were significant differences among epidemic components of the different isolates at the two temperature conditions,and the correlation between lesion cumulative sporulation and lesion daily-expanded area was the highest.The parasitic fitness of every tested isolates at 22℃ was lower than that at 18℃.The parasitic fitness of the isolates with low sensitivity to temperature was totally higher than that of moderately sensitive and highly sensitive isolates at the two temperature conditions.This tendency was more obvious at the higher temperature.