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Molecular and morphological characterization of Pyricularia and allied genera

     Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand

P. Lumyong

     Department of Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand 50200

T. Seelanan

     Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand

D.C. Park
E.H.C. McKenzie

     Landcare Research, Private Bag 92170, Auckland, New Zealand

K.D. Hyde

     Centre for Research in Fungal Diversity, Department of Ecology & Biodiversity, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China

The phylogenetic relationships of Pyricularia species and species from related genera were established from sequences of the internal transcribed spacer ribosomal RNA gene. Phylogenetic analysis disclosed a consistent correlation with spore morphology. Most Pyricularia species studied, and two species of Dactylaria that have obpyriform conidia, fell within the Magnaporthaceae cluster with high bootstrap support. Pyricularia variabilis was more related to Dactylaria, Tumularia or Ochroconis species than to the Magnaporthaceae. Dactylaria and species of Nakataea, Ochroconis, Pyriculariopsis and Tumularia were distinct from the Magnaporthaceae, and the genus Dactylaria is polyphyletic. The combination of morphological and molecular characters, such as spore morphology and ITS ribosomal DNA sequences data, suggested that conidial shape could be a primary character to distinguish Pyricularia from related genera.

Key words: Dactylaria, ITS rDNA, phylogeny, systematics, 5.8S rDNA

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