Mycological Progress

, Volume 11, Issue 2, pp 351–359 | Cite as

A new species of Pustula (Oomycetes, Albuginales) is the causal agent of sunflower white rust

Original Article

Abstract

White blister rust of sunflower is an emerging disease that is among the most important diseases in this crop in South Africa and has recently spread to Europe. For the genus Albugo, it has been demonstrated that species are mostly at least host genus specific and that several previously overlooked species are present on Brassicaceae. It thus seems likely that previously unrecognised species are also present in the genus Pustula. Based on previous phylogenetic reconstruction in combination with differences in oospore ornamentation, it is revealed that Pustula on sunflower, previously attributed to Pustula tragopogonis (syn. Albugo tragopogonis), is distinct from Pustula on Tragopogon. Therefore, this pathogen is described as a new species, Pustula helianthicola. In addition, taxonomic observations revealed that Pustula tragopogonis is an incorrect name and is replaced by the new combination, Pustula obtusata.

Keywords

Albuginaceae Albugo tragopogonis Helianthus annuus Morphology Oospores 

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Copyright information

© German Mycological Society and Springer 2011

Authors and Affiliations

  1. 1.Institute of Botany 210University of HohenheimStuttgartGermany
  2. 2.Biodiversity and Climate Research CentreFrankfurtGermany
  3. 3.Department of Biological Sciences, Institute of Ecology, Evolution and DiversityGoethe UniversityFrankfurtGermany

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