北京市及河北省小麦赤霉病菌群体遗传结构及生物学特性

Population genetic structure and biological characteristics of Fusarium graminearum on wheat in Beijing and Hebei

本文分析了北京市与河北省小麦赤霉病菌群体遗传结构以及基础生物学特性。结果表明所有菌株均为禾谷镰刀菌(Fusarium graminearum),属于一个大的单一群体,群体内具有较高的遗传多样性。毒素化学型测定表明,北京与河北地区小麦真菌毒素污染的主要风险为DON与15ADON毒素。表型测定显示,与F.asiaticum群体相比,F.graminearum具有较高的产孢能力,而生长速率和产毒能力较低。该群体对主要杀菌剂多菌灵、戊唑醇和氰烯菌酯均无抗药性。

In this study,the genetic diversity and several phenotypes of the pathogens of Fusarium head blight on wheat in Beijing and Hebei were analyzed.All isolates were Fusarium graminearum,belonging to one random mating population.High level of genetic diversity within population was observed.The determination of trichothecene chemotype showed that DON and15 ADON were the main threats to wheat production in this area.Comparing to F.asiaticum,F.graminearum population revealed higher conidial production,lower growth rate and trichothecene production.No resistant isolates to carbendazim,tebuconazole and phenamacril were identified.