Roberts P A
Department of Zoology, Oregon State University, Corvallis 97333.
Chromosoma. 1988 Nov;97(3):254-60. doi: 10.1007/BF00292969.
In Drosophila gibberosa, differences between midgut and salivary gland chromosomes fall into two categories: tissue-specific band modulations which persist throughout the 90 h developmental period that we studied and tissue-specific puffs. Puffs that are common to both tissues tend to appear earlier in the midgut. Some major early ecdysteroid-induced puffs appear simultaneously in both tissues at the end of the third larval instar; however, the many late puffs that follow in the salivary glands are absent from the midgut. Intense puff activity in the early third larval instar midgut declines at the time of the hormonal pulse that initiates intense gene and secretory activity in salivary glands; the sloughing of midgut cells ensues.
在果蝇中，中肠和唾液腺染色体之间的差异可分为两类：在我们研究的90小时发育期间持续存在的组织特异性带型调制以及组织特异性胀泡。两个组织共有的胀泡往往在中肠中出现得更早。一些主要的早期蜕皮甾体诱导胀泡在第三龄幼虫末期同时出现在两个组织中；然而，唾液腺中随后出现的许多晚期胀泡在中肠中并不存在。在第三龄幼虫早期中肠中强烈的胀泡活性在引发唾液腺中强烈基因和分泌活性的激素脉冲时下降；随后中肠细胞开始脱落。
