doi: 10.4489/KJM.2025.53.3.9 Citation BibTeX RIS Mendeley

Morphology and Phylogeny of Erysiphe actinostemmatis Affecting Actinostemma lobatum in Korea

Morphology and Phylogeny of Erysiphe actinostemmatis Affecting Actinostemma lobatum in Korea

• Lamiya Abasova (Department of Plant Medicine, Jeonbuk National University, Jeonju 54896, Korea & Research Center for Plant Medicine, Jeonbuk National University, Jeonju 54896, Korea)
• In-Young Choi (Department of Plant Medicine, Jeonbuk National University, Jeonju 54896, Korea & Research Center for Plant Medicine, Jeonbuk National University, Jeonju 54896, Korea)
• Hye-Ryeong Jang (Department of Plant Medicine, Jeonbuk National University, Jeonju 54896, Korea & Research Center for Plant Medicine, Jeonbuk National University, Jeonju 54896, Korea)
• Gyo-Seon Shin (Forest Carbon Graduate School, Kookmin University, Seoul 02707, Korea)
• Ji-Hyun Park (Forest Carbon Graduate School, Kookmin University, Seoul 02707, Korea & Department of Forestry, Environment, and Systems, Kookmin University, Seoul 02707, Korea)
• Hyeon-Dong Shin (Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Korea)

Erysiphe actinostemmatis is the only known powdery mildew fungus affecting Actinostemma lobatum (Cucurbitaceae) in Japan and China. Anamorph morphology was insufficiently described, and the phylogenetic placement of this species is unknown. To characterize E. actinostemmatis, eight Korean samples collected between 2007 and 2022 were morphologically examined, and the nucleotide sequences of the large subunit (LSU or 28S) gene and internal transcribed spacer (ITS) regions of rDNA were determined using three voucher specimens. Phylogenetic analyses revealed that E. actinostemmatis formed a distinct clade that diverged from the E. aquilegiae clade. In this study, the detailed morphological characterization of the anamorph, including conidial germination patterns and hyphal appressoria, and molecular phylogeny were discussed for the first time, and the sequences of the ITS and LSU genes were provided.