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Molecular phylogenetic relationships amongst Alternaria species and related fungi based upon analysis of nuclear ITS and mt SSU rDNA sequences

Published online by Cambridge University Press:  02 February 2001

Barry M. PRYOR  and
Robert L. GILBERTSON
Barry M. PRYOR
Affiliation:
Department of Plant Pathology, University of California, One Shields Ave., Davis, CA 95616, USA. E-mail: bmpryor@ucdavis.edu
Robert L. GILBERTSON
Affiliation:
Department of Plant Pathology, University of California, One Shields Ave., Davis, CA 95616, USA. E-mail: bmpryor@ucdavis.edu
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Abstract

To elucidate relationships among Alternaria, Ulocladium, and Stemphylium species, nuclear internal transcribed spacer (ITS) and mitochondrial small subunit (SSU) ribosomal DNA (rDNA) sequences from 18 Alternaria, four Ulocladium and four Stemphylium spp. were determined and compared. Phylogenetic analysis of the ITS and SSU rDNA sequences, performed by the neighbour joining and maximum parsimony methods, revealed that the Stemphylium spp. were phylogenetically distinct from the Alternaria and Ulocladium spp. Most Alternaria spp. and the Ulocladium spp. were placed together in a large Alternaria/Ulocladium clade. Within this large clade, the Alternaria spp. clustered into several distinct species-clades, most of which correlated with species-groups previously established based upon morphological characteristics. The Ulocladium spp. were placed into two species-clades, each of which also included Alternaria spp. A. longissima was distantly related to the other Alternaria spp., as well as the Ulocladium and Stemphylium spp. Based upon ITS and nuclear 18S rDNA sequence identities, A. longissima was most closely related to Leptosphaeria.

Type
Research Article
Information
Mycological Research , Volume 104 , Issue 11 , November 2000 , pp. 1312 - 1321
Copyright
© The British Mycological Society 2000

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