Mycobiology.  2018 Dec;46(4):416-420. 10.1080/12298093.2018.1547485.

Bremia itoana (Oomycota, Peronosporales), a Specialized Downy Mildew Pathogen on an East Asian Plant, Crepidiastrum sonchifolium (Asteraceae)

• Choi YJ
• Park JH
• Lee J
• Shin HD

• KMID: 2434570
• DOI: http://doi.org/10.1080/12298093.2018.1547485

Abstract

Crepidiastrum sonchifolium, a flowering plant in the daisy family (Asteraceae), is native to East Asia. In Korea, this plant is a locally cultivated vegetable, and its market size is gradually growing. Since the plants with downy mildew infection were initially found at a private farm of Chuncheon city, the occurrences have continued in commercial farms of other regions, highlighting that this disease is spreading throughout Korea. The pathogen was attributed to a member of the genus Bremia that contains many specialized species, each of which displays a narrow host spectrum on Asteraceae. Based on morphological and molecular phylogenetic analyses, along with the high host specificity recently proven for Bremia species, the identity of the causal agent was confirmed as a so far undescribed species of Bremia. Here, we introduce Bremia itoana sp. nov., specific to C. sonchifolium.

Keyword

Barcoding; Cichorioideae; cox2 mtDNA; downy mildew; newly emerging disease

MeSH Terms

Agriculture
Asian Continental Ancestry Group*
Asteraceae
Far East
Flowers
Gangwon-do
Host Specificity
Humans
Korea
Plants*
Vegetables