蓝莓腐霉根腐病的病原菌

在山东青岛新发现一种蓝莓根腐病害,症状最初出现在根部,病根腐烂坏死,根状茎维管束和皮层变黑,导致根数量减少,叶片变黄、变红,植株生长不良,严重时叶片全部脱落,植株死亡。通过组织分离法和菌丝段分离法获得纯化菌株HMQAU 180018,经柯赫氏法则验证,综合形态学特征及ITS区和cox I基因序列分析,菌株HMQAU 180018被鉴定为畸雌腐霉Pythium irregulare。这是国内首次描述畸雌腐霉引起蓝莓根腐病的报道。

The pathogen causing blueberry Pythium root rot

Blueberry root rot disease was found for the first time in Qingdao, Shandong Province. The earliest symptoms occurred on root, then the diseased roots became rot and necrotic, and the vascular bundle and bark of rhizomes turned black. As a result, the radication became underdeveloped, the leaves turned yellow and red, and the plant grew poorly. In severe cases, all the leaves fell and the plant died. The pure isolate HMQAU180018 was obtained by tissue isolation method and mycelium segment isolation method. According to the pathogenicity test by Koch’s postulates, morphological and biological characteristics, sequence analyses of ITS and cox I, the pathogen was identified as Pythium irregulare. This is the first report of blueberry root rot caused by P. irregulare in China.