Two types of embryos with different functions are generated in the polyembryonic wasp Macrocentrus cingulum (Hymenoptera: Braconidae)
Two types of embryos with different functions are generated in the polyembryonic wasp Macrocentrus cingulum (Hymenoptera: Braconidae)
复制标题
DOI：
10.1016/j.asd.2015.04.007
复制
发表时间：
2015-11-01
影响因子：
2
通讯作者：
Zhang, Wenqing
中科院分区：
文献类型：
--
作者：
Hu, Jian;Wang, Peng;Zhang, Wenqing
在这项研究中，我们报告了两种类型的胚胎，正常和假胚，从一个单一的卵的多胚幼虫内寄生茧蜂（茧蜂科）。M.扣带幼虫在宿主血腔中发育，从宿主中出来化蛹。经卵裂和胚胎增殖后，寄主幼虫体内产生数十个正常胚胎和数千个假胚。正常胚胎和假胚之间的区别在于前者发育成幼虫，而后者则不会。在正常胚胎中发育的原基被起源于合胞体的胚外膜所包围。假胚则相反，它只由一个含有许多大核的合胞体组成，并在胚胎发育过程中不断产生。假胚和早期胚胎都具有致密的微绒毛，其功能是从宿主那里吸收营养。羽化后，由正常胚胎产生的黄蜂幼虫以假胚为食。因此，来自同一个卵子的两种类型的胚胎具有不同的功能。这些结果有助于我们了解多胚寄生蜂的发育。(C)2015爱思唯尔有限公司版权所有。
In this study, we report that two types of embryos, normal and pseudogerm, are generated from a single egg of the polyembryonic larval endoparasitoid Macrocentrus cingulum (Braconidae). M. cingulum larvae develop in the host hemocoel, emerging from the host to pupate. After egg cleavage and embryo proliferation dozens of normal embryos and thousands of pseudogerms are generated in the host larva. The difference between normal embryos and pseudogerms is that the former develop into larvae while the latter do not. The primordium that develops in normal embryos is surrounded by an extraembryonic membrane that originates from the syncytium. Pseudogerms in contrast consist only of a syncytium containing many large nuclei and are continuously generated during embryonic development. Both pseudogerms and early embryos possess dense microvilli that function to absorb nutrients from the host. After eclosion wasp larvae produced from normal embryos feed on pseudogerms. Therefore, two types of embryos originating from the same egg serve different functions. These results contribute to our understanding of the development of polyembryonic parasitoids. (C) 2015 Elsevier Ltd. All rights reserved.