IMA Fungus 6(2): 483-491, doi: 10.5598/imafungus.2015.06.02.12
Baobabopsis, a new genus of graminicolous downy mildews from tropical Australia, with an updated key to the genera of downy mildews
Marco Thines‡, Sabine Telle§, Young-Joon Choi§, Yu Pei Tan|, Roger G. Shivas¶‡ Biodiversity and Climate Reserch Centre (BiK-F), Frankfurt, Germany§ Integrative Fungal Research (IPF), Frankfurt am Main, Germany| Ecosciences Precinct, Plant Pathology Herbarium, Department of Agriculture and Fisheries, Brisbane, Australia¶ Plant Biosecurity Cooperative Research Centre, Bruce, Australia
© Marco Thines, Sabine Telle, Young-Joon Choi, Yu Tan, Roger Shivas. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY-NC 4.0), which permits to copy and distribute the article for non-commercial purposes, provided that the article is not altered or modified and the original author and source are credited. Citation:
Thines M, Telle S, Choi Y-J, Tan Y, Shivas RG (2015) Baobabopsis, a new genus of graminicolous downy mildews from tropical Australia, with an updated key to the genera of downy mildews. IMA Fungus 6(2): 483-491. https://doi.org/10.5598/imafungus.2015.06.02.12 |  |
Abstract
So far 19 genera of downy mildews have been described, of which seven are parasitic to grasses. Here, we introduce a new genus, Baobabopsis, to accommodate two distinctive downy mildews, B. donbarrettiisp. nov., collected on Perotis rara in northern Australia, and B. enneapogonis sp. nov., collected on Enneapogon spp. in western and central Australia. Baobabopsis donbarrettii produced both oospores and sporangiospores that are morphologically distinct from other downy mildews on grasses. Molecular phylogenetic analyses showed that the two species of Baobabopsis occupied an isolated position among the known genera of graminicolous downy mildews. The importance of the Poaceae for the evolution of downy mildews is highlighted by the observation that more than a third of the known genera of downy mildews occur on grasses, while more than 90 % of the known species of downy mildews infect eudicots.
Keywords
cox2, genus key, nrLSU, phylogeny, Peronosporaceae, Poaceae