Phylogeny of the Glomeromycota (arbuscular mycorrhizal fungi): recent developments and new gene markers

被引:107
作者
Redecker, Dirk [1 ]
Raab, Philipp [1 ]
机构
[1] Univ Basel, Inst Bot, CH-4056 Basel, Switzerland
关键词
arbuscular mycorrhiza; evolutionary history; ribosomal RNA genes; RNA polymerase genes;
D O I
10.3852/mycologia.98.6.885
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The fungal symbionts of arbuscular mycor rhiza form a monophyletic group in the true Fungi, the phylum Glomeromycota. Fewer than 200 described species currently are included in this group. The only member of this clade known to form a different type of symbiosis is Geosiphon pyriformis, which associates with cyanobacteria. Because none of these fungi has been cultivated Without their plant hosts or cyanobacterial partners, progress in obtaining multigene phylogenies has been slow and the nuclear-encoded ribosomal RNA genes have remained the only widely accessible molecular markers. rDNA phylogenies have revealed considerable polyphyly of some glomeromycotan genera that has been used to reassess taxonomic concepts. Environmental Studies using phylogenetic methods for molecular identification have recovered an amazing diversity of unknown phylotypes, suggesting considerable cryptic species diversity. Protein gene sequences that have become available recently have challenged the rDNA-supported sister group relationship of the Glomeromycota with Asco/Basidiomycota. However the number of taxa analyzed with these new markers is still too small to provide a comprehensive picture of intraphylum relationships. We rise nuclear-en coded rDNA and rpb1 protein gene sequences to reassess the phylogeny of the Glomeromycota and discuss possible implications.
引用
收藏
页码:885 / 895
页数:11
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