Morphological and Molecular Characterization of Podosphaera Powdery Mildew on Fatoua villosa in Korea

In-Young Choi¹ Lamiya Abasova¹ Joon-Ho Choi¹ Chong-Kyu Lee² Hyeon-Dong Shin^13,*

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Abstract

In Japan and China, Podosphaera pseudofusca causes powdery mildew in Fatoua villosa. During a taxonomic revision of Korean powdery mildew fungi, isolates newly collected from F. villosa were studied. Through morphological examination and molecular phylogenetic analyses of the internal transcribed spacer region and large subunit gene of rDNA, the powdery mildew fungus was identified as Podosphaera xanthii. In this study, we propose the merging of P. pseudofusca sensu Braun into the P. xanthii complex. To the best of our knowledge, this is the first report of Podosphaera powdery mildew on F. villosa in Korea.

Figures & Tables

Fig. 1. powdery mildew on Fatoua villosa. A: The powdery mildew covers the leaves and stems of F. villosa. B: Numerous chasmothecia formed on the upper leaf surface. C, D: Close-up of chasmothecia formed on the leaf (C) and stem (D). E, F: Conidiophores. G: Conidia. Note conspicuous fibrosin bodies inside the cell. H-K: Conidia in germination. L: Chasmothecium with an ascus. M-O: Asci. Note sessile (M), sub-sessile (N) and short-stalked (O) base of the asci. P: Ascospores.