昆虫围食膜的研究进展

围食膜是大多数昆虫中肠内的半透性薄膜 ,主要由几丁质、蛋白质构成。依据其形成的方式分 :Ⅰ型围食膜 ,由整个中肠细胞分泌形成多层管状膜 ;Ⅱ型围食膜由中肠前端特殊的细胞分泌成连续的套筒管状膜。由于位于食物与中肠上皮细胞间而在中肠生理中起重要作用 ,围食膜保护中肠上皮免于机械损伤以及病原菌、毒素的入侵 ;作为半透膜以及将中肠分为不同的区室而在营养物质的消化和吸收中具有重要作用。该文综述了有关围食膜结构、组分、功能、通透性以及与害虫防治的关系等方面的研究进展。

Progress in research on peritrophic membrane of insect

The gut of most insects is lined with a semi|permeable peritrophic membrane (PM),composed of chintin and proteins.A PM occurs in two forms according to the modes of development. PM Ⅰ is delaminated from the entire midgut epithellium, PM Ⅱ is produced by a specialized region of the anterior midgut and forms a continuous sleeve(or sleeves) that is always present.As it is positioned between food and the midgut epithelium,the PM plays key roles in digestive physiology of the insect.The PM may protect the midgut epithelium from mechanical damage and invasion of pathogens and toxins;it must act as a semipermeable membrane and it may separate the midgut lumen into different compartments,which play important roles in the digest and ingest of the nutrient.Research advances on structure,components,function,permeability and the relationship to insect pest management are summarized.