文献类型：期刊文献

英文题名：Phylogenetic and Morphological Identification of the Novel Pathogen of Rheum palmatum Leaf Spot in Gansu, China

作者：Wang, Yan[1];Charkowski, Amy O.[2];Zeng, Cuiyun[1];Zhu, Tiantian[1];Wang, Huizhen[1];Chen, Honggang[1]

第一作者：王艳;王琰;王燕

通信作者：Wang, Y[1]

机构：[1]Gansu Univ Chinese Med, Lanzhou 730000, Peoples R China;[2]Univ Wisconsin, Dept Plant Pathol, Madison, WI 53706 USA

第一机构：甘肃中医药大学

通信机构：[1]corresponding author), Gansu Univ Chinese Med, Lanzhou 730000, Peoples R China.|[10735]甘肃中医药大学;

年份：2016

卷号：44

期号：2

起止页码：93

外文期刊名：MYCOBIOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000385289700004)】；

基金：The authors are grateful to reviewers for critical comments, corrections and pre-submission reviews. This study has been supported by the National Natural Science Foundation of China, project 31460013; Gansu Nature Science Fund, project 1312RJZA092 and Gansu College Scientific Research, project 2013A-089.

语种：英文

外文关键词：Internal transcribed spacer rDNA; Novel pathogen; Rheum palmatum; Taxonomy

摘要：A new leaf spot disease was observed on leaves of Rheum palmatum (Chinese rhubarb) in Northwest China (Gansu Province) starting in 2005. A Septoria-like fungus was isolated and completion of Koch's postulates confirmed that the fungus was the casual agent of the leaf spot disease. Morphology and molecular methods were combined to identify the pathogen. The fungus produced conidiomata pycnidia and the conidia were 2 similar to 5 septate, 61.2 similar to 134.1 mu m in length and 3.53 similar to 5.3 mu m in width, which is much larger than the known Spetoria species that infects Polygonaceae species. Phylogenic analysis of the internal transcribed spacer region confirmed that this Septoria-like fungus is within the Septoria genus but distinct from known Septoria species. Together, these morphological and phylogenetic data support that the R. palmatum infecting Septoria strain is a newly-described plant pathogenic species.