Abstract
The genusMicrosphaera has been considered to be derived from sectionErysiphe of the genusErysiphe by a single event. Cleistothecial appendages are the most distinct difference between the two genera and have an important role for overwintering. To understand the phylogenetic relationship betweenErysiphe sectionErysiphe andMicrosphaera more precisely, phylogenetic trees were constructed using the nucleotide sequences of the rDNA ITS region from 11Erysiphe (sectionErysiphe) and 16Microsphaera taxa. The phylogenetic trees indicated the close relationship between the two genera. However, the generaErysiphe (sectionErysiphe) andMicrosphaera did not group into separate monophyletic lineages; instead, they formed several small clusters that were mixed together. This result suggests that the differentiations of the genera occurred two or more times independently. This also supports the idea that appendage morphology does not always accurately reflect the phylogeny of the powdery mildews because the morphology of appendages may evolve convergently under the selection pressure of their particular biotopes (host plants).
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Contribution No. 144 from the Laboratory of Plant Pathology, Mie University.
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Takamatsu, S., Hirata, T., Sato, Y. et al. Phylogenetic relationships ofMicrosphaera andErysiphe sectionErysiphe (powdery mildews) inferred from the rDNA ITS sequences. Mycoscience 40, 259–268 (1999). https://doi.org/10.1007/BF02463963
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DOI: https://doi.org/10.1007/BF02463963