Early amphibian (anuran) morphogenesis is sensitive to novel gravitational fields.
Early amphibian (anuran) morphogenesis is sensitive to novel gravitational fields.
复制标题
早期两栖动物（蜮）的形态发生对新的引力场很敏感。
DOI：
10.1006/dbio.1993.1024
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发表时间：
1993
影响因子：
2.7
通讯作者：
G. Malacinski
中科院分区：
文献类型：
--
作者：
A. Neff;H. Yokota;H. Chung;M. Wakahara;G. Malacinski
无尾两栖动物胚胎(非洲爪哇和林蛙)对新的引力场非常敏感。在模拟失重条件下，(1)在8-细胞期，第一条水平分裂沟的位置向营养极移动；(2)囊胚体腔在囊胚期的位置更居中，囊腔顶层细胞层数增加；(3)在原肠胚期，背唇看起来更靠近营养极；(4)在孵化蝌蚪期，头和眼的尺寸增大。模拟超重力的效果与模拟失重相反，只是与模拟失重不同的是，超重力减少了喂养蝌蚪的原始生殖细胞的数量。尽管在早期胚胎发育中有这些巨大的差异，但处于喂养阶段的蝌蚪基本上与对照组没有什么区别。
Anuran amphibian embryos (Xenopus laevis and Rana dybowskii) are sensitive to novel gravitational fields. Under simulated weightlessness, (i) the location of the first horizontal cleavage furrow was shifted toward the vegetal pole at the eight-cell stage; (ii) the position of the blastocoel was more centered, and the number of cell layers in the blastocoel roof was increased at the blastula stage; (iii) the dorsal lip appeared closer to the vegetal pole at the gastrula stage; and (iv) head and eye dimensions were enlarged at the hatching tadpole stage. Effects of simulated hypergravity were opposite to those of simulated weightlessness, except that hypergravity, unlike simulated weightlessness, reduced the number of primordial germ cells in feeding tadpoles. Despite those dramatic differences in the early embryogenesis, tadpoles at the feeding stage are largely indistinguishable from controls.