安徽省辣椒疫霉交配型的分布及在无性后代的遗传

 测定了采自安徽省岳西、潜山、和县、合肥、寿县、淮南、阜南、亳州等不同地区的64 株辣椒疫霉菌株的交配型,并用10 μg / mL 的甲霜灵处理A1 交配型的菌株HN8 和A2 交配型的菌株HN3,分别获得抗性突变菌株HN8-Mrt和HN3-Mrt,进一步测定交配型在HN8、HN3 及其抗性突变株游动孢子后代中的遗传稳定性。结果发现,供试菌株中A2 交配型58 株(占90． 6% );A1 交配型6 株(占9. 4% ),未发现A0 、A1 A2 和A1 ,A2 交配型;A2 交配型全省各地均有分布,A1 交配型只出现在和县、淮南和阜南3 地;HN8-Mrt与HN8、HN3-Mrt与HN3 的交配型分别相同,各菌株单游动孢子后代的交配型均与其亲本分别相同。结果说明,辣椒疫霉交配型在安徽的分布呈不均等的态势,其中以A2 型占绝对优势;用甲霜灵处理不会诱导辣椒疫霉交配型的变异,交配型在辣椒疫霉的游动孢子后代中能稳定遗传。

Distribution of mating types of Phytophthora capsici and inheritance in asexual progenies in Anhui Province

The mating types of 64 isolates of Phytophthora capsici collected from Yuexi,Qianshan,Hexian,Hefei,Shouxian,Huainan Funan and Bozhou of Anhui Province were investigated.The results showed that 58 isolates of A2(accounting for 90.6% of the total isolates) and 6 isolates of A1(accounting for 9.4%) were detected.No isolates of A0,A1,A2 and A1A2 were discovered.A2 isolates were detected from all sampling regions,but A1 only in Hexian,Huainan,and Funan.It was suggested that the mating types of P.capsici isolates in Anhui were not evenly distributed and A2 was the main mating type and absolutely preponderant in Anhui.HN8-Mrt and HN3-Mrt,the metalaxyl-resistant isolates were obtained from the wild-type isolate HN8 and HN3 after treatment with 10μg/mL metalaxyl,respectively.Further research indicated that mating type could not be changed by metalaxyl treatment and it could be stably inherited through single zoospore progeny of P.capsici.