title: Comparison of silk glands of diapause and non-diapause larval Sitodiplosis mosellana.
abstract: The wheat midge, Sitodiplosis mosellana (Géhin) (Diptera: Cecidomyiidae), is one of the most serious pests of wheat worldwide. It overwinters as cocooned larvae in diapause and non-diapause forms. The cocoon is made of silk from the salivary glands. The silk glands, therefore, play an important role in the S. mosellana diapause. In the present study, the ultra-structures of the silk glands between diapause and non-diapause larvae were examined by electro and light-microscopically. The silk glands consist of 156 cells organized like moniliform particles. Although silk gland cells of both diapause and non-diapause larvae contain developed organelles, including the endoplasmic reticulum, dictyosome, mitochondria, and lipid droplet, the organelles in non-diapause larvae are more developed than those in diapause larvae. These morphological characteristics of the silk glands in the diapause and non-diapause larvae can be used to distinguish the diapause status of the larvae.
authors: Key Laboratory of Applied Entomology, College of Plant Protection, Northwest A & F University, Yangling, Shaanxi 712100, China.
authors: Yiping
authors: Y
authors: Li
authors: Junxiang
authors: J
authors: Wu
authors: Weining
authors: W
authors: Cheng
authors: Weiwu
authors: W
authors: Song
authors: Xiangqun
authors: X
authors: Yuan
mesh_terms: D000818:Animals; D004175:Diptera / Q000254:growth & development / Q000502:physiology / Q000648:ultrastructure*; D004956:Estivation; D007814:Larva / Q000254:growth & development / Q000502:physiology / Q000648:ultrastructure; D008675:Metamorphosis, Biological; D008854:Microscopy, Electron; D012469:Salivary Glands / Q000648:ultrastructure; D047011:Silk / Q000378:metabolism
chemical_list: D047011:Silk