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Mycobiology. 2018 Dec 11;46(4):416-420. doi: 10.1080/12298093.2018.1547485. eCollection 2018.

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

Author information

1
Department of Biology, Kunsan National University, Gunsan, Korea.
2
Center for Convergent Agrobioengineering (CECA), Kunsan National University, Gunsan, Korea.
3
Department of Crop Life Safety, Crop Protection Division National Institute of Agricultural Science, RDA, Wanju, Korea.
4
Division of Environmental Science and Ecological Engineering College of Life Sciences and Biotechnology, Korea University, Seoul, Korea.

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.

KEYWORDS:

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

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