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《Mycosystema》 2006-02
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Phylogenetic relationships of Alternaria and related genera and taxonomic status of A. leucanthemi inferred from ITS rDNA sequence analysis

ZHAO Guo-Zhu1, 2 ZHANG Tian-Yu1* CAO Ai-Xin2 WANG Hong-Kai1 (1. Department of Plant Pathology, Shandong Agricultural University, Taian 271018) (2. Key Laboratory of Systematic Mycology & Lichenology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080)  
In order to further elucidate the relationships among Alternaria, Ulocladium, Stemphylium, Nimbya and Embellisia and their teleomorphic Pleospora and Lewia, nuclear internal transcribed spacer (ITS) and 5.8SrDNA from these genera/species are determined and compared. Alignment of the 5.8S/ITS of the tested isolates shows that 5.8SrDNA are highly conserved. The ITS sequences, especially ITS1, are very variable in both base composition and length. Phylogenetic analysis of the 5.8S/ITS sequence data sets by NJ (Neighbor-joining) method clearly separated these tested fungi on generic level. The results indicate that Alternaria spp., Ulocladium spp., Nimbya spp. and Embellisia spp. are placed together in a large Alternaria-complex clade and are closely related, they are relatively differentiated to some extent; Stemphylium spp. are clustered in a distant clade and phylogenetically distinct from the other four genera, showing a relative independent evolution. The anamorphic Stemphylium spp. and its teleomorphic Pleospora spp. are clustered in a clade. Such a phylogenetic consistency on different genetic phase of strains strongly testifies that using these methods and different analysis regions of rDNA selected are very valuable in studying systematics of these fungi. Based upon 5.8S/ITS sequence identities, Alternaria leucanthemi is obviously different from most Alternaria spp.. It is closely related to Stemphylium spp. and Bipolaris spp., and its present taxonomic status is doubtful.
【Fund】: 国家自然科学基金项目(39899400);; 中国科学院微生物研究所真菌地衣系统学重点实验室(915)课题资助
【CateGory Index】: Q931
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