THE EMBRYONIC MOLTS OF THE MILKWEED BUG AS SEEN BY THE SEM
THE EMBRYONIC MOLTS OF THE MILKWEED BUG AS SEEN BY THE SEM
复制标题
DOI：
10.1016/0040-8166(81)90019-7
复制
发表时间：
1981-01-01
期刊：
影响因子：
2.6
通讯作者：
HOFFMANN, P
中科院分区：
文献类型：
--
作者：
DORN, A;HOFFMANN, P
本文研究了三种胚胎表皮的沉积、脱落和去除。膜状角质层1在退化过程中覆盖胚胎，之后消失。角质层2沉积开始前不久背关闭。它的脱顶伴随着胚胎的收缩。第二层角质层在孵化时蜕皮。只有角质层3（=第1幼虫角质层）显示出类似感器和角膜的分化。在角质层1和角质层2的脱膜过程中观察到蜕皮类固醇（可能还有保幼激素）滴度的峰值（多恩，1981）。从外胚层到表皮的过渡发生在角质层2合成开始之前不久和期间。
Deposition, detachment and removal of the 3 embryonic cuticles are studied. The membrane-like cuticle 1 covers the embryo during katatrepsis and disappears thereafter. Cuticle 2 deposition starts shortly before dorsal closure. Its apolysis is accompanied by contractions of the embryo. Ecdysis of cuticle 2 takes place during hatching. Only cuticle 3 (= 1st larval cuticle) shows differentiations like sensilla and cornea. Peaks of ecdysteroid (and probably juvenile hormone) titer are observed during apolysis of cuticle 1 and cuticle 2 (Dorn, 1981). Transition from ectoderm to epidermis proper takes place shortly before and during onset of cuticle 2 synthesis.