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Abstract
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.
This work was supported by The Thailand Research Fund (Royal Golden Jubilee Ph.D. Program 4B4M/43/D1, BGJ 4680011) and The Biodiversity and Training Program (BRT 142006). International Collection of Microorganisms from Plants (ICMP), National Institute of Technology and Evaluation Biological Resource Center (NBRC). The Mycotheque de l’ Universite Catholique de Louvain-la-Neuve (MUCL) and B. Paulus provided some isolates of Pyricularia and related genera. J.M. Young, M. Fletcher and R. Kodsueb are thanked for culture arrangement. Landcare Research, Auckland provided facilities and resources for B. Bussaban to carry out much of this work.