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链霉菌Snea49是从大豆根际中分离得到的对大豆胞囊线虫具有杀线虫活性的菌株,采用离体贝氏皿室内测定放线菌Snea49的发酵代谢产物对北方根结线虫、南方根结线虫、甘薯茎线虫3种植物寄生线虫和自由生活的小杆线虫的杀线虫活性。结果表明:处理24 h后,贝式小皿检测菌株Snea49的代谢物对北方根结线虫和南方根结线虫表现出较高的生物活性,对甘薯茎线虫毒力次之,对土壤中非靶标小杆线虫毒力最弱,即对不同种类线虫存在选择性毒力差异,而且随稀释倍数增加毒力减弱。
Streptomyces Snea49 is isolated from the soybean rhizosphere nebacterium on the nematode nematicidal activity of the strains, the use of in vitro Panzhihua Shi actinomycetes Snea49 fermentative metabolites on the root-knot nematodes, root knot nematodes Nematode, three plant parasitic nematodes and free-living nematodes nematicidal activity. The results showed that after 24 h treatment, the metabolites of the small-sized test-tube strain Snea49 showed high biological activity against M. root-knot nematodes and M. incognita, followed by the virulence of S. dipsaci and the non-target small Actinomyces virulent weakest, that is, there are selective toxicity differences between different species of nematodes, but also with the dilution factor increased toxicity weakened.