马拉硫磷对东亚飞蝗消化道影响的形态学观察

为探讨农药马拉硫磷对东亚飞蝗Locusta migratioria manilensis(Meyen)消化系统的影响,文中以喂食形式给药,不同喂食时间点蝗虫处死后固定、石蜡包埋、连续切片、HE染色并观察蝗虫消化系统不同部位形态学的病理变化。结果表明马拉硫磷对东亚飞蝗嗉囊、前胃、胃盲囊、中肠、回肠、结肠、直肠等各消化道部位均能造成明显的形态学改变,包括内膜完整性被破坏、上皮细胞死亡、纵肌、环肌、结缔组织等病变和坏死等,且呈时间依赖性。故马拉硫磷的作用可以影响到东亚飞蝗对食物贮存、研磨、消化、养分吸收的每一个环节,最终导致蝗虫的死亡。本文研究结果对蝗虫防治研究具有重要意义。

Morphology of the digestive system of Locusta migratioria manilensis after ingesting malathion

The digestive system of Locusta migratioria manilensis （Meyen） that had ingested Malathion was observed under light microscopy. The morphology of the crop, proventriculus, gastric caecum, midgut, ileum, ccolon and rectum was affected markedly by contact with Malathion. The main pathological changes were damaged intima, dead epithelial cells, necrotic longitudinal muscle, necrotic circular muscle, and so on. These results here demonstrate that Malathion can adversely affect on the complete process of digestion, including food storage, grinding and nutrient absorption, ultimately causing death.