Identification of endophytic Bacillus BHL3501 from wild soybean and its inhibitory effect against soybean cyst nematode (Heterodera glycines Ichinohe).

[Objective] The paper was to identify endophytic bacillus BHL3501 from wild soybean and its inhibitory effect against soybean cyst nematode. [Method] Through morphological characteristic, physiological and biochemical characteristics and 16S rDNA analysis, a strain of endophytic bacterium BHL3501 with nematicidal activity isolated and screened from the root of wild soybean was identified, the effects of BHL3501 metabolite solutions with different dilution multiples on egg hatching and activity of 2nd instar juvenile of soybean cyst nematode were also studied. [Result] BHL3501 strain was preliminarily identified to be Bacillus sp.. The relative inhibitory rate of its original fermentation broth on egg hatching of soybean cyst nematode after 24 h was 98.3%; the relative inhibitory rate under 10-time diluted solution treatment was 79.5%, which had significant difference with sterile water control. The corrected mortality rate of 2nd instar juvenile was 93.1% after treated by original fermentation broth for 24 h, the treatments of all diluted solutions had significant difference with sterile water control. [Conclusion] BHL3501 metabolites had strong inhibitory effect against egg hatching of soybean cyst nematode, which also had strong toxic effect on its 2nd instar juvenile.