臭腹腺蝗(直翅目:锥头蝗科)中肠内营养物-水分的流动和吸收(英文)  

Nutrient-water fluxes and uptake along the midgut of Zonocerus variegatus (L.) (Orthoptera: Pyrgomorphidae)

作　　者：Bassey E. AKPAN Tonye G. OKORIE 

机构地区：[1]Department of Zoology, University of Uyo, Uyo, Nigeria [2]Department of Zoology, University of Ibadan, Ibadan, Nigeria

出　　处：《昆虫学报》2006年第1期10-15,共6页Acta Entomologica Sinica

摘　　要：对臭腹腺蝗Zonoceru svariegatus中肠内水分和营养物的流动和吸收进行了研究,以期确定其流动模式及在该虫对氰化氢适应方面的意义。对中肠细胞进行了组织切片观察;测定了K+,Na+和蛋白质沿中肠的浓度梯度,并观察了中肠对K+,Na+,Ca2+,Mg2+和甲基蓝的通透性。结果表明,中肠(胃和胃盲囊)组织上结构相似,均由具有纹状边缘的柱状细胞构成。营养物质在中肠不同部分的浓度不同。测试物在整个中肠中流动,中肠各段均参与了食物和水分的吸收。臭腹腺蝗肠内没有像大多数直翅目昆虫那样自后肠的液流逆向流动。肠溶物的单向流动可以防止有毒物质的积累,使臭腹腺蝗成功耐受木薯叶中的氰化氢。Circulation of water and nutrients in the midgut of Zonocerus variegatus was studied to determine the flux pattern and its possible implication in the adaptation of the insect to hydrogen cyanide. Histological sections of midgut cells were observed. Gradients of K^＋, Na^＋ and protein along midgut were determined. The permeability of midgut segments to K^＋ , Na^＋, Ca^2＋, Mg^2＋ and methyl blue was observed. The midgut （ventriculus and gastric caeca） was histologically similar, and made of columnar cells with striated borders. The nutrients varied in concentration in the different midgut segments. The substances tested for permeability passed through the midgut segments. It was concluded that the entire midgut was involved in food and water absorption. There was no counter flow of fluids from the posterior midgut as in most orthopterans. One-way movement of the gut contents prevents accumulation of toxic substances to injurious levels, enabling the insect to favourably tolerate hydrogen cyanide in cassava leaves.

关 键 词：臭腹腺蝗 中肠 营养 水分 通透性 流动 吸收 

分 类 号：Q965[生物学—昆虫学]