Res. Plant Dis > Volume 27(3); 2021 > Article
Research in Plant Disease 2021;27(3):107-114.
DOI:    Published online September 30, 2021.
Morphology and Molecular Characteristics of Alternaria sonchi Causing Brown Leaf Spot on Sonchus asper in Korea
Huan Luo1, Myung Soo Park2, Jun Myoung Yu1
1Department of Applied Biology, Chungnam National University, Daejeon 34134, Korea
2School of Biological Sciences and Institute of Microbiology, Seoul National University, Seoul 08826, Korea
Correspondence:  Jun Myoung Yu, Tel: +82-42-821-5768, Fax: +82-42-823-8679, 
Received: July 20, 2021   Revised: September 15, 2021   Accepted: September 29, 2021
During a disease survey on weeds and minor cultivated crops in Korea, a brown leaf spot disease was observed on Sonchus asper. Leaf lesions were round or irregular in shape, and grayish brown to brown with a purple margin. In severe infection, lesions enlarged and coalesced, resulting in blighting of the leaves. The isolates from these leaf lesions were identified as Alternaira sonchi based on morphological characteristics and phylogenetic analyses of Internal transcribed spacer region, Alternaria allergen a1, glyceraldehyde 3-phosphate dehydrogenase, RNA polymerase II, and translation elongation factor genes. This study provides a comprehensive description of the morphological characteristics and phylogenetical traits of A. sonchi causing brown leaf spot on S. asper in Korea.
Key Words: Alternaria sonchi, Morphology, Pathogenicity, Phylogenetic analysis

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