| The experiment mainly studies the ultra structure and biochemical component of the nematode-trapping fungus — Arthrobotrys oligospora strain A1 and discusses some irritant factors connecting with the production of the predacious organs. The results proved that the nematode-trapping fungus— Arthrobotrys oligospora strain A1 subordinates diaphragmatic fungus, being the pore on the center of diaphragm . Hypha cell is long type like bamboo segment . The predacious organs of the strain are annulus and cohesive nets and the hypha which is different from the vegetative mycelium. In the cytosol there are many electro-densities which are about circular particles in different size and array on the marginal area of the hypha cell of the predacious organs, this is the important character of the fungus. The assay of the coarse protein , a variety of amino acid about nematode-trapping fungus — Arthrobotrys oligospora strain A1 and the third stage larva showed that the contents of the coarse protein and a variety of amino acid of larva are mostly higher than that of predacious organs containing annulus and cohesive net ,conidia and hypha in the different growth phases. The results also showed that the chemical constituents of predacious organs are not the same as the common hypha .. the contents of valine and leucine of the nematode are obvious higher than that of others in different kinds of amino acid of the nematode. The analysis of irritant factors playing a important role on the production of predacious organs showed that live nematode larva or its lytic solution can cause the production of predacious organs of the strain A1, but the latter produced less than the former .The live larva of the third stage produced more predacious organs than one of the first and the second stage , so the number of predacious organs that are produced by the live larva of first and the second the stage are less than the live larva of the third stage . Live nematode eggs ,adults and its lytic solution can not produce predacious organs by stimulating the strain A1. |
