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Journal of Biological Sciences

Year: 2006 | Volume: 6 | Issue: 3 | Page No.: 572-580
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Authors

M. Daami-Remadi

H. Jabnoun-Khiareddine

F. Ayed

K. Hibar

I.E.A Znaidi

M. El Mahjoub

Keywords

Eight thermo-resistant fungi isolated from compost extracts are tested, for the first time in Tunisia, for their antagonistic activity, in vitro by dual culture with Fusarium spp. on PDA and in vivo by wound treatment prior to tuber inoculation. In vitro experiments showed that all tested compost fungi significantly inhibited mycelial growth of F. graminearum, F. sambucinum, F. solani and F. oxysporum f.sp. tuberosi, observed after incubation at 25°C during 6 days, revealing a higher competition. Light microscopic studies of tested pathogen mycelium, removed from the confrontation zone of both microorganisms, showed multiple mechanisms of action including mycoparasitism, lysis, early formation of chlamydospores and induction of mycelial cords via anatomosis between mycelial filaments. Tuber (cv. Spunta) treatment, 24 h before their inoculation by individually thermoresistant fungi suspensions, reduced development of dry rot after incubation for 21 days at 25-27°C, comparatively to the untreated control and this for the majority of the Fusarium complex tested.
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