根结线虫天敌真菌的筛选研究初报

A PRELIMINARY STUDY OF NEMATODE-DESTROYlNG FUNGI OF ROOT-KNOT NEMATODE

从土壤和病株上分离到10个线虫的天敌真菌菌株,其中有三个菌株较有希望,烛台霉属(Candelabrello sp.)一个。孤孢属(Monacrosporium spp.)两个,菌株代号分别为CN_7;CN_(?)和CN_5。 据试验:CN_7较好,菌丝体生长的温度范围是20～33℃,最适宜的温度范围是25～30℃,以式捕捉环捕食线虫,对培养基选择性不强,最适宜的pH值是6.0～7.5,但在pH4.5～8.0都能进收缩行捕捉,捕捉器官形成量多,捕虫势强且稳定,在水中也能形成捕捉环并捕食线虫。

Ten nematode-destroying fungi of root-knot nematode were obtained by direct isolation from soil and diseased root-knot nematode. Among these strains three of them were stronger, one belongs to Candelabrella sp. and two under the jurisdiction of Monacrosporium spp. respectively, the code names were CN7 , CN3 and CN5 .The data logging of test exhibited that CN7 was the strongest. The range of suitable temperature for haphae growth was 23-33℃, the most suitable range was 25-30℃. It traped nematodes by constricting rings. As for medium there was nearly no selection. The strain caplured noma tcdes at pH 4.5-8.0, but the suitable pH was 6.0-7.5. Under this condition more preying organs were produced and capture-ability was stronger and stable. While in water preying organs were formed too and capable of capturing nematodes.