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首页> 外文期刊>Belgian Journal of Zoology >Early interaction between deep and superficial layers in avian blastodiscs: uptake of ooplasmic determinants
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Early interaction between deep and superficial layers in avian blastodiscs: uptake of ooplasmic determinants

机译：鸟胚盘深层和浅层之间的早期相互作用：卵质决定簇的摄取

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摘要

Parts from radially symmetric prelaid quail blastodiscs placed in culture in contact with isolated cranial quadrants from unincubated chicken blastoderms induce in the chicken upper layer the formation of a miniature embryo with primitive streak and neural plate. Both components (blastodisc parts and upper layer fragments) do not differentiate into an embryo when cultured apart. We concluded that the fort-nation of the avian blastoderm is the result of an interaction between the deep part of the blastodisc and the uncommitted upper layer. Indeed during the culture period the deep part of the quail blastodisc differentiates into quail sickle endoblast and quail junctional endoblast, indicating the formation of Rauber's sickle material in the quail tissue which by induction gives rise to the development of an embryo in the neighbouring upper layer. The here observed induction phenomena result from placing early deep material on more advanced upper layer. This suggests an analogy with the phenomena observed after the eccentric, radially-symmetry-breaking displacement of the deep layer, with reference to the superficial layer which occurs during normal bilateral symmetrization under influence of gravity in undisturbed eggs in utero.
机译：放置在培养物中的径向对称预置鹌鹑胚盘与未孵化的鸡胚盘的孤立象限相接触的部分在鸡的上层中诱导了具有原始条纹和神经板的微型胚胎的形成。分开培养时，两种成分（胚盘部分和上层碎片）都不会分化成胚胎。我们得出的结论是，禽胚盘的堡垒是胚盘深部与未承付的上层相互作用的结果。的确，在培养期间，鹌鹑胚盘的深部分化为鹌鹑镰刀内胚层和鹌鹑结合内胚层，这表明Rauber镰刀材料在鹌鹑组织中形成，通过诱导在邻近的上层形成了胚胎。此处观察到的感应现象是由于将较早的深层材料放置在更高级的上层上引起的。这表明与在深层偏心的，径向对称的破坏性位移之后观察到的现象类似，该现象是指在正常双侧对称过程中在重力作用下子宫内未受扰动的卵子中发生的表层。

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