Soybean root rot caused by Fusarium oxysporum is a destructive soilborne pathogen and is of economic importance in all soybean producing areas. Bacillus subtilis strain Y2 is a potential bacterial biocontrol agent against F. oxysporum. An antagonistic mechanism ofB. subtilis Y2 against F. oxysporum was conducted. The antagonistic mechanism of strain Y2 against F. oxysporum effectively inhibited mycelial growth, sporulation and germination. The activity of germfree filtrate of strain Y2 was sensitive to high-temperature (121°C). The results preliminary showed that B. subtilis strain Y2 had no effect on soybean seed germination and growth. Soybean root rot caused by F. oxysporum had effectively been prevented up to 98.77% by B. subtilis Y2 in potted plant experiments.
Key words: Soybean root rot, Bacillus subtilis, Fusarium oxysporum, antagonistic mechanism, control effect.
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