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<p>Species of the obligate biotrophic oomycete genus <i>Bremia</i> comprise a highly host-specific group of pathogens which cause downy mildew disease on several members of <i>Asteraceae</i>. The diversity of the genus has long been overlooked due to the lack of obvious morphological differences. However, molecular phylogenies revealed the presence of various host-specific lineages, many of which had not been formally described. Over a decade has passed since the first comprehensive multigene phylogeny, and only a few <i>Bremia</i> species have since been introduced. For this study, we decided to take a closer look at the diversity of <i>Bremia</i> species which infect commonly and widely distributed species of hawksbeard (<i>Crepis</i>) in Germany. In total, we report five new <i>Bremia</i> species from five different <i>Crepis</i> species based on DIC microscopy and phylogenetic inference.</p>

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Novel insights into Bremia diversity on hawksbeards (Crepis spp.)

  • 期刊论文

  • 发表日期：

    2025年12月28日

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  • Ilias Kontos,
  • Youn-Joon Choi,
  • Marco Thines

摘要

Species of the obligate biotrophic oomycete genus Bremia comprise a highly host-specific group of pathogens which cause downy mildew disease on several members of Asteraceae. The diversity of the genus has long been overlooked due to the lack of obvious morphological differences. However, molecular phylogenies revealed the presence of various host-specific lineages, many of which had not been formally described. Over a decade has passed since the first comprehensive multigene phylogeny, and only a few Bremia species have since been introduced. For this study, we decided to take a closer look at the diversity of Bremia species which infect commonly and widely distributed species of hawksbeard (Crepis) in Germany. In total, we report five new Bremia species from five different Crepis species based on DIC microscopy and phylogenetic inference.