即墨白庙芋头软腐病病原菌鉴定

Identification of the pathogen causing soft rot on Baimiao taro in Jimo

芋头(Colocasia esculenta (L.) Schoot)属天南星科芋属单子叶多年生草本植物,是世界上分布最广的作物之一[1]。其地下块茎富含淀粉和各种微量矿物元素,在世界各地广泛种植,是一种深受人们喜爱的健康食品,并且在医药和观赏方面具有多种用途[2-3]。我国是世界芋头种植大国之一,各地区均有种植[4]。白庙芋头为山东即墨特产,有600余年的栽培历史。

Taro is a widely planted commercial crop in China.From 2020 to 2021,a serious soft rot disease occurred in the Baimiao taro planting area in Jimo District,Shandong,China.10 isolates with the same morphological characteristics were isolated from the diseased taro,and the pathogen were identified as Pectobacterium aroidearum based on the morphological characteristics,Biolog identification,phylogenetic tree constructed by pmrA sequences and MLSA of 4 housekeeping genes(icd、gapA、mdh and mtlD).Pathogenicity test showed that P.aroidearum can cause soft rot symptoms in taro,carrot,potato,Chinese yam,Chinese cabbage,rape,onion,and sweet potato.This is the first report that P.aroidearum can cause soft rot in taro.The research results will provide biological basis for the control of taro soft rot.