title: Phylogenetic analyses of DNA sequences reveal species partitions amongst isolates of Armillaria from Africa.
abstract: The basidiomycete genus Armillaria causes root rot and death to woody plants in boreal, temperate and tropical regions of the world. Armillaria root rot has been described from various parts of Africa on many different hosts. However, very little is known regarding the evolutionary relationships among Armillaria species in Africa. The aim of this study was to determine the phylogenetic relationships between isolates originating from different regions in Africa using nDNA sequences from two non-coding gene regions. The ITS and the IGS-1 regions of the ribosomal DNA operon were sequenced and analysed using different phylogenetic tree searching methods. Phylogenetic trees grouped the African taxa in two strongly supported clades. One of these represented A. fuscipes and the other an undescribed but distinct species.
authors.affiliation: Department of Genetics, Tree Protection Co-operative Programme, Forestry and Agricultural Biotechnology Institute, University of Pretoria, South Africa.
authors.forename: Martin P A
authors.initials: MP
authors.lastname: Coetzee
authors.forename: Brenda D
authors.initials: BD
authors.lastname: Wingfield
authors.forename: Paulette
authors.initials: P
authors.lastname: Bloomer
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Wingfield
mesh_terms: D000349:Africa; D000363:Agaricales / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D001483:Base Sequence; D003001:Cloning, Molecular; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D021901:DNA, Intergenic / Q000737:chemistry / Q000235:genetics; D019143:Evolution, Molecular; D014644:Genetic Variation; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012341:RNA, Ribosomal, 5S / Q000737:chemistry / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
chemical_list: D004271:DNA, Fungal; D021901:DNA, Intergenic; D012341:RNA, Ribosomal, 5S