内蒙古天竺葵腐霉枯萎病病原菌The pathogen of geranium Pythium blight in Inner Mongolia
银玲;景山幸二;田迅;李依韦;赵汝;
摘要(Abstract)：
为了明确天竺葵腐霉枯萎病的病原菌种类,从内蒙古通辽采集天竺葵腐霉枯萎病样品,对病原物进行了分离、纯化和致病性测定,并对病原物进行形态学和rDNA-ITS序列分析鉴定。结果表明,从10个植物样品中分离得到16个腐霉菌株,分别属于终极腐霉Pythium ultimum var.ultimum、瓜果腐霉P.aphanidermatum和两个与P.ultimum var.ultimum相似的待定种。其中,P.ultimum var.ultimum的分离频率为75%、P.aphanidermatum的分离频率为12.5%,两个腐霉待定种的分离频率均为6.25%;P.ultimum var.ultimum是优势类群。致病性测定结果表明,4种腐霉菌都能引起天竺葵腐霉枯萎病,与自然发病症状相同,其中P.ultimum var.ultimum和P.aphanidermatum的致病性较强,发病率分别为71.4%和85.7%。
关键词(KeyWords)： 天竺葵;腐霉枯萎病;形态特征;rDNA-ITS序列
基金项目(Foundation): 国家自然科学基金(31160353,31360574);; 通辽市与内蒙古民族大学科技合作项目(SXYB2012063)~~
作者(Authors): 银玲;景山幸二;田迅;李依韦;赵汝;
DOI: 10.13346/j.mycosystema.150015
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