期刊
PLANT PATHOLOGY
卷 64, 期 2, 页码 425-433出版社
WILEY
DOI: 10.1111/ppa.12274
关键词
Alternaria; DNA sequencing; histone 3 gene; morphological traits; Solanum tuberosum; species identification
资金
- Chinese Universities Scientific Fund [2013CH015]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1042]
The population structure of Alternaria species associated with potato foliar diseases in China has not been previously examined thoroughly. Between 2010 and 2013, a total of 511 Alternaria isolates were obtained from diseased potato leaves sampled in 16 provinces, autonomous regions or municipalities of China. Based on morphological traits and molecular characteristics, all the isolates were identified as Alternaria tenuissima, A.alternata or A.solani. Of the three species, A.tenuissima was the most prevalent (755%), followed by A.alternata (186%) and A.solani (59%). Phylogenetic analysis based on sequences of the internal transcribed spacer (ITS) region of ribosomal DNA (rDNA) of representative Alternaria isolates showed that A.solani was distinct from the two small-spored Alternaria species. Phylogenetic analysis of the partial coding sequence of the histone 3 gene divided the same collection of isolates into three main clades representing A.tenuissima, A.alternata and A.solani, respectively. The pathogenicity of the isolates on detached leaves of potato cv. Favorite did not differ significantly between the three species or between isolates from different geographical origins. The results indicate that the population structure of Alternaria species associated with potato foliar diseases differs from that reported previously in China. This is the first report of A.tenuissima causing potato foliar diseases in China.
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