Phytopathogenic complex of the genus Fusarium in wheat varieties grown in Siberia

Abstract

A phytopathogenic complex of the genus Fusarium, common on 19 wheat varieties cultivated in Siberia, was investigated. It was found eleven fungal species in wheat grain (Fusarium avenaceum, F. culmorum, F. diversisporum, F. heterosporum, F. oxysporum, F.poae, F. sambucinum, F. incarnatum, F. sporotrichioides, F. tricinctum, Neocosmospora solani), with the dominant one being F. sporotrichioides (from 23 to 68 % of the total number of species). Seven species were found in the rhizosphere of wheat (F. avenaceum, F.incarnatum, F. oxysporum, F. sambucinum, F. sporotrichioides, F. tricinctum, N. solani), with the most common being F. oxysporum (up to 39 %) and F. sporotrichioides (up to 35%). Biotesting a mixture of metabolites in wheat seeds and seedlings revealed highly toxic species, namely F. sporotrichioides and F. oxysporum (a decrease of in vitro seed germination by more than 55 % and a prolonged inhibitory effect on seedling development). F. avenaceum, N.solani and F. culmorum are moderately toxic species. The greatest danger for the development of wheat fusariosis in Siberia in terms of the total frequency of occurrence, phytotoxic and phytopathogenic properties is represented by F. sporotrichioides.