(82)Involvement of Resistance Induction by Hypovirulent Binucleate Rhizoctonia in the Biological Control of Fusarium Crown and Root Rot of Tomato

概要

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Roots of tomato seedlings growing on 2% water agar were inoculated with living cell and culture filtrate of hypovirulent binucleate Rhizoctonia (HBNR), and then 24h later, they were inoculated with Fusarium oxysporum f.. sp. radicis-lycopersici (FORL) at 0,3, 6, and 9cm away from the position of HBNR inoculum. Seedlings treated with living cell and culture filtrate of HBNR isolates resulted in significant reduction of lesion development of fusarium crown and root rot (FCRR) by 33 to 96% and 32 to 98%, respectively, after 4 to 6 days of pathogen inoculation. The reduction decreased as the distance between HBNR and FORL inoculum became longer. Even direct contact between HBNR and FORL was avoided by enveloping the HBNR inoculum with polycarbonate membrane filters (0.45μm). significant reduction on the lesion development of FCRR was also observed. Antibiosis was not observed between HBNR isolates and FORL. It is thought that induced resistance in tomato plants by HBNR is involved as one of the mechanisms of the biological control against FCRR.
日本植物病理学会の論文
2003-02-25