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Epitypification and phylogeny of Colletotrichum acutatum J.H. Simmonds

Than, P.P. and Shivas, R.G. and Jeewon, R. and Pongsupasamit, S. and Marney, T.S. and Taylor, P.W.J. and Hyde, K.D. (2008) Epitypification and phylogeny of Colletotrichum acutatum J.H. Simmonds. Fungal Diversity, 28 . pp. 97-108.

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Article Link(s): http://www.fungaldiversity.org/fdp/sfdp/28-9.pdf

Organisation URL: http://www.fungaldiversity.org/fdp/fdp.htm

Abstract

Simmonds introduced Colletotrichum acutatum in 1965, validated in 1968, with a broad concept, as demonstrated by the selection of several type specimens from a range of hosts. This has created some confusion in the species concept and identification of C. acutatum. There are no viable ex-type cultures of C. acutatum and furthermore there are no existing cultures of C. acutatum on Carica papaya from the type locality in south-east Queensland. The application of molecular phylogenetic studies to isolates of C. acutatum is only meaningful if the taxonomy is stable and species are properly named. In order to clarify the species concept of C. acutatum, an isolate of Colletotrichum acutatum from Carica papaya from Yandina in Southeast Queensland (Australia) is designated as an epitype. A detailed morphological description is provided. Phylogenies based on a combined ITS and beta-tubulin gene analysis indicate that C. acutatum bears close phylogenetic affinities to C. gloeosporioides and C. capsici. Results also indicate that C. acutatum is monophyletic and there is a close relationship between the epitype and other Australian C. acutatum isolates from Carica papaya. Molecular data, however did not provide further evidence to properly elucidate the taxonomie affinities of C. acutatum especially the holotype and epitype. Our studies indicate that given the complexity of the genus Colletotrichum, there is a need to check previously described type specimens and redesign neotypes where necessary in order to clarify taxonomie uncertainties.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science, Plant Science
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Fungal Diversity Press.
Keywords:Carica papaya; Colletotrichum acutatum; epitype; plant pathogen; taxonomy; Colletotrichum; Colletotrichum capsici; Glomerella acutata.
Subjects:Science > Botany > Cryptogams
Deposited On:12 Jan 2009 01:59
Last Modified:26 Oct 2011 04:26

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