关键词: 白粉菌, 多样性, 寄主多样性, 中国东北, 东北亚

Abstract

Aims: The systematic inventory and classification of fungi in various geographical regions are the core focus of biodiversity research. Powdery mildew fungi are a kind of obligate parasitic and pathogenic fungi that are widely distributed worldwide and can cause powdery mildew diseases in forest trees, fruit trees, garden flowers, crops, vegetables, and herbaceous plants. This study aims to comprehend the diversity of powdery mildew fungi and their hosts in Northeast China and other regions of Northeast Asia.

Method: Based on literature collection, data analysis, combined with the authors’ field specimen collection and specimen examination from 2022 to 2023, we provided inventories of powdery mildew fungi according to the latest classification and inventories of their host plants, and geographic distribution information in Northeast China and other regions of Northeast Asia.

Results: We found 159 powdery mildew fungi (including 142 species and 17 varieties) in Northeast China, belonging to 1 family, 5 tribes, 10 teleomorphic genera and 1 anamorph genus of Erysiphaceae, distributed on 572 species of host plants (including 37 varieties) in 243 genera and 64 families. A total of 304 powdery mildew fungi (including 258 species and 46 varieties) belonging to 1 family, 5 tribes, 12 teleomorphic genera and 2 anamorph genera were distributed on 1,171 species of host plants (including 163 varieties) in 449 genera and 108 families in Japan. In Republic of Korea, there were 165 powdery mildew fungi (including 150 species and 15 varieties) belonging to 1 family, 5 tribes, 11 teleomorphic genera and 1 anamorph genus, distributed on 515 species of host plants (including 53 varieties) in 255 genera and 79 families. A total of 111 powdery mildew fungi (including 89 species and 22 varieties) belonging to 1 family, 5 tribes, 8 teleomorphic genera and 2 anamorph genera in Russian Far East were recorded. There were 50 shared powdery mildew fungi in Northeast China, Japan, Republic of Korea, and Russian Far East, and they belong to eight common teleomorphic genera (Blumeria, Podosphaera, Sawadaea, Erysiphe, Golovinomyces, Neoërysiphe, Leveillula, and Phyllactinia) and were distributed on the same or closely related host plants. Japan and Republic of Korea had the most shared species of powdery fungi (136 species). In Northeast China, Japan and Republic of Korea, 28, 116, and 17 species were endemic, respectively. There were a total of 1,760 species (including 263 varieties) of host plants belonging to 112 families and 541 genera in Northeast Asia.

Conclusions: There are 318 species and 53 varieties of powdery mildews in Northeast China, Japan, Republic of Korea, and Russian Far East, accounting for 40.33% of the global total, while Northeast Asia only accounts for about 8% of the global land area. Therefore, Northeast Asia is a key area and mycobiota unit for the study of powdery mildew diversity. This study provides a data support for establishing profiles of diversity and mycobiota studies, phylogenetic relationships, and host diversity of powdery mildew fungi in Northeast Asia.

Key words: powdery mildew fungi/powdery mildews, diversity, host diversity, Northeast China, Northeast Asia