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本文详细研究了甜菜夜蛾spodopteraexigua(H櫣ｂｎｅｒ)胚胎发育的卵裂、胚盘、胚带的形成和胚层分化。甜菜夜蛾卵的周质分两层 ;卵裂时子核以“彗星”状活质体向卵表面迁移 ,形成胚盘 ;卵黄逐渐形成卵黄球 ,内有 1～ 2个消黄细胞 ;卵腹面的胚盘细胞逐渐增厚为胚带 ,其他胚盘细胞发育成浆膜 ,浆膜刚一形成 ,羊膜即开始发生 ;随着原肠沟的出现 ,胚带分化为里、外两层 ,外层将来形成外胚层 ,里层形成中胚层和内胚层。
In this paper, we studied in detail the formation of cleavage, germ plate, and embryo band and the differentiation of germ layers in embryos of Spodoptera exigua (H 櫣 bner). Spodoptera exigua egg periplasm in two layers; cleavage when the nucleus to “comet” -like living plastids migrate to the egg surface to form the blastoderm; yolk gradually formed egg yolk ball, there are 1 to 2 eliminate yellow cells; egg Abdominal surface of the blastodermal cells gradually thicken as the embryo zone, other blastodermal cells develop into serosa, serosa just formed, the amniotic membrane that began to occur; with the emergence of the original gut ditch, embryo differentiation into the inner and outer layers, The outer layer will form ectoderm in the future, and the inner layer will form mesoderm and endoderm.