ワモンゴキブリの背脈管膊動ならびに呼吸に及ぼす殺線虫剤の影響

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  • Effects of the Nematocides on Heart Pulsation and Respiration of American Cockroach, <i>Periplaneta americana</i> L.
  • ワモンゴキブリ ノ ハイ ミャクカンハクドウ ナラビニ コキュウ ニ オヨボス サツセンチュウザイ ノ エイキョウ

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To study the basic mode of action of nematocides, the effects of ethylene dibromide (EDB), cis-1, 3-dichloropropene (cis-D) and 1, 2-dibromo-3-chloropropane (DBCP) on heart pulsation and respiration of American cockroach were investigated.<br>1. The heart pulsation of EDB injected insect decreased slowly and became irregular and weak. But in insect injected with DBCP or cis-D, the heart pulsation did not change for relatively long period after paralysis, and then suddenly it became irregular and stopped.<br>2. In insect poisoned by DBCP or cis-D, the oxygen consumption increased with the onset of hyperactivity and slowly decreased with the onset of paralysis. In insect poisoned by EDB, no hyperactivity occurred, but the respiration increased.<br>3. The oxygen consumption of coxal muscle slices of the cockroach was inhibited 21.5 per cent by 1.8×10-3M EDB, 18.5 per cent by DBCP and 17.0 per cent by cis-D, respectively.<br>4. Among the enzymes of the tricarboxylic acid cycle, only the succinic dehydrogenase was inhibited by EDB, but other enzymes were not affected. DBCP and cis-D had no effect on any enzymes of tricarboxylic acid cycle. EDB at final concentration 1×10-3M inhibited approximately 50 per cent of the succinic dehydrogenase in vitro.<br>5. The symptom of EDB poisoning was parallel with the succinic dehydrogenase inhibition in vivo, and the enzyme was inhibited about 37 per cent when the roach was paralyzed completely.

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