Hostname: page-component-848d4c4894-xm8r8 Total loading time: 0 Render date: 2024-06-16T19:17:21.631Z Has data issue: false hasContentIssue false

Phylogenetic relationships among smut fungi parasitizing dicotyledons based on ITS sequence analysis

Published online by Cambridge University Press:  19 August 2002

Teresa ALMARAZ
Affiliation:
Real Jardín Botánico (CSIC), Plaza de Murillo 2, 28014 Madrid, Spain.
Christophe ROUX
Affiliation:
Equipe de Mycologie Végétale, UMR CNRS 5546, Pôle de biotechnologie végétale, chemin de Borde Rouge, BP 17, 31326, Castanet-Tolosan, France.
Stephan MAUMONT
Affiliation:
Laboratoire d'Ecologie Terrestre, UMR CNRS 5552, Université Paul Sabatier, 118 route de Narbonne, bat. 4R3, 31062 Toulouse Cedex 4, France.
Guy DURRIEU
Affiliation:
Chemin Flou de Riou, 31000 Pouvourville, Toulouse, France.
Get access

Abstract

The phylogenetic relationships of several smut fungi parasitic on dicotyledons were analysed. Parsimony analysis was performed based on the sequences of the ITS regions of the rDNA genes. Three genera were considered: Microbotryum, Sphacelotheca and Ustilago. The cladogram showed a dichotomy: the species of Microbotryum and Ustilago parasitic on dicotyledons (dicot Ustilago) were found to be divided into two independent taxa among the Microbotryaceae. A divergent mechanism of evolution of the species of each of these two clades with their respective hosts could be involved in this dichotomy. According to our results, Microbotryum appears monophyletic and restricted to the anthericolous smuts on Caryophyllaceae. However, no morphological characters have yet been found to support this distinction, and we refute the denomination Bauhinus as defined by Moore to describe the group of ‘dicot Ustilago’ as it leads to controversial determinations. Sphacelotheca belongs to Microbotryales, but could not be synonymised with Microbotryum as S. polygoni-persicariae is in an independent clade. Lastly, U. duriaeana is independent of the ‘dicot Ustilago’ clade; the position of this species among Microbotryales is still uncertain.

Type
Research Article
Copyright
© The British Mycological Society 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)