An altered root exudation pattern through mycorrhization affecting microconidia germination of the highly specialized tomato pathogen Fusarium oxysporum f. sp. lycopersici (Fol) is not tomato specific but also occurs in Fol nonhost plants

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Abstract

The effect of root exudates from plants colonized or noncolonized by the arbuscular mycorrhizal fungus Glomus mosseae on microconidia germination of Fusarium oxysporum f. sp. lycopersici (Fol) was studied. Root exudates from the Fol-host tomato and root exudates from Fol nonhost plants were tested. Root exudates from all tested plants stimulated microconidia germination. Mycorrhization increased the stimulatory effect exhibited by the root exudates from the Fol host tomato and from all Fol nonhost plants, showing that similar changes occur in the root exudates of all plants after mycorrhization.

Les auteurs ont étudié l'effet des exsudats racinaires de plants, colonisés ou non colonisés par le champignon mycorhiziens arbusculaire Glomus mosseae, sur la germination des microconidies du Fusarium oxysporum f. sp. lycopersici(Fol). Il ont testé des exsudats racinaires de tomates hôtes Fol et de plants non hôtes Fol. Les exsudats de toutes les plantes stimulent la germination des microconidies. La mycorhization augmente l'effet stimulateur des exsudats racinaires des tomates hôtes Fol et des plants non hôtes Fol, ce qui montre que des changement similaires surviennent dans les exsudats racinaires de toutes les plantes, après mycorhization.

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