Fusarioid fungi associated with woody plants in Russia
Yu. A. Litovka1,2, H. Chen3, W. Li3, I. N. Pavlov1,2
1Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russia
2V. N. Sukachev Institute of Forest SB RAS, Krasnoyarsk, Russia
3Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
Keywords: phytopathogenic fungi, species complexes, identification, host plant, woody plants, fusarioid fungi, Fusarium, Neocosmospora
Abstract
At present, the taxonomy of fusarioid fungi has changed significantly due to the clarification of their taxonomic status by molecular genetic methods. This led to the emergence of new species / genera and the abolition of old ones. Data on the diversity and distribution of Fusarium species do not always correspond to modern taxonomy and require careful revision. In this work, we systematized long-term data on the species composition and specialization of fusarioid fungi associated with woody plants in Russia (Far East, Siberia, Northwestern region, Crimea). Molecular genetic identification of 53 isolates previously identified as Fusarium spp. was carried out. Using morphological characters, phylogenetic analysis, and ecological features, five Fusarium species complexes have been identified. 11 Fusarium species have been identified (F. acuminatum, F. avenaceum, F. equiseti, F. oxysporum, F. redolens, F. reticulatum, F. sambucinum, F. sporotrichioides, F. torulosum, F. tricinctum, F. venenatum) and 1 closely related species of the genus Neocosmospora (N. solani). On woody plants, the Fusarium tricinctum species complex is represented by the largest number of species: F. acuminatum, F. avenaceum, F. reticulatum, F. torulosum and F. tricinctum. The maximum number of isolates (17) belong to the F. avenaceum associated with various plants throughout the study area. In forest nurseries (Central and Southern Siberia) on juvenile plants with symptoms of mycosis, seven species of Fusarium and N. solani were identified. F. oxysporum, F. equiseti and N. solani were found only on seedlings of conifers in the first year of vegetation. In forest and park stands, where fusarioid fungi are predominantly saprotrophs and endophytes, nine Fusarium species were found, of which F. tricinctum, F. torulosum, F. venenatum and F. reticulatum were not isolated from pathological and seed material in forest nurseries.
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