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Int J Syst Evol Microbiol 56 (2006), 1709-1715; DOI  10.1099/ijs.0.63990-0
© 2006 International Union of Microbiological Societies

Molecular systematics of the subaerial green algal order Trentepohliales: an assessment based on morphological and molecular data

Juan M. López-Bautista1, Fabio Rindi2 and Michael D. Guiry2

1 Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL 35487-0345, USA
2 Martin Ryan Institute, National University of Ireland, Galway, Ireland

Correspondence
Juan M. López-Bautista
jlopez{at}bama.ua.edu

The order Trentepohliales is a widespread group of terrestrial green algae. As currently circumscribed, it includes six genera (Cephaleuros, Phycopeltis, Physolinum, Printzina, Stomatochroon and Trentepohlia), the phylogenetic affinities of which are poorly understood. Sequences for the small subunit rRNA gene (18S rDNA) were obtained for several representatives of the order and phylogenetic analyses based on these sequences were compared with the traditional system of classification based on morphological characters. The results indicate that the morphological criteria used for the circumscription of genera and species of the Trentepohliales do not match phylogenetic patterns. Whereas isolates of Cephaleuros form a well-supported monophyletic clade, Trentepohlia is polyphyletic and strains of Trentepohlia, Phycopeltis, Printzina and Physolinum are mixed together in several different lineages. A reassessment of the generic boundaries and a narrower circumscription of some genera (in particular Trentepohlia) will be necessary. Subcuticular habit, heteromorphic life history and occurrence of zoosporangia in clusters are shown to be phylogenetically significant features, whereas other characters commonly used for separation of species and genera (shape and size of the cells, prostrate/erect habit, substratum colonized) have no phylogenetic relevance.

The GenBank/EMBL/DDBJ accession numbers for the new 18S rRNA gene sequences determined in this study are DQ399583–DQ399595, as listed in Table 1.






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Copyright © 2006 by the International Union of Microbiological Societies.