@ARTICLE{TreeBASE2Ref15320, author = {Meizhu Du and Christopher Lewis Schardl and Etta M. Nuckles and Lisa J. Vaillancourt}, title = {Using Mating-Type Gene Sequences for Improved Phylogenetic Resolution of Colletotrichum Species Complexes}, year = {2005}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Mycologia}, volume = {97}, number = {}, pages = {641--658}, abstract = {Colletotrichum species are defined primarily on the basis of host preference and morphology of the organism in planta and in culture. However, the genus contains several species complexes that encompass such a broad range of morphological and pathological variation that the species name is of relatively little use either to the taxonomist or to the plant pathologist. Phylogenetic analyses, primarily based on variable regions of the ribosomal DNA (rDNA) sequences, have indicated that these species complexes comprise a variable number of identifiable monophyletic clades. However, rDNA sequences are often insufficiently diverse to fully resolve such closely related lineages. A group of isolates representing three species complexes (C. graminicola, C. gloeosporioides, and C. acutatum) were analyzed by using the high mobility group (HMG)-encoding sequence of the MAT1-2 mating type sequence, which has been shown in other fungi to be especially suitable for distinguishing relationships among closely related groups. Results were compared with those obtained from analysis of variable regions of the rDNA, as well as from standard morphological classification methods. Results achieved through analysis of MAT1-2 sequences correlated well with those obtained by analysis of rDNA sequences, but provided significantly better resolution among the various lineages. Morphological traits including hyphopodial size, colony appearance, spore size, appressorial shape and size, and host preference were frequently unreliable as indicators of phylogenetic association. Spore shape and hyphopodial shape were more often (but not always) useful for this purpose.} }

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