The making of symbiont capsule in the plataspid stinkbug Megacopta punctatissima
The making of symbiont capsule in the plataspid stinkbug Megacopta punctatissima
复制标题
DOI：
10.1016/j.femsec.2005.06.002
复制
发表时间：
2005-11-01
影响因子：
4.2
通讯作者：
Fukatsu, T
中科院分区：
文献类型：
--
作者：
Hosokawa, T;Kikuchi, Y;Fukatsu, T
在Plataspidae家族的臭虫中，成年雌性在其卵块的下侧存款小的褐色颗粒，其中含有特定的共生细菌。新生儿摄食的内容物结构独特，称为“共生体胶囊”，借此共生体发生垂直传播。利用光学显微镜和电子显微镜研究了日本平盾蝽Megaeopta punctatissima共生体被膜的微细结构和形成过程。结果表明：（1）被囊由“共生体”、“基质”和“被膜”三部分组成，（2）雌性成虫后中肠具有“中肠薄隐窝段”、“中肠膨大隐窝段”和“中肠褐膨大段”等特殊解剖结构;（iii）不同的胶囊组分，共生体，基质和包膜，分别由特化的中肠部分TCM，SCM和BEM产生和/或提供;和（iv）胶囊组分储存在BEM中并在产卵期间排出以产生共生体胶囊。这些结果表明，寄主昆虫为共生体的传播付出了巨大的代价。高度发达的，女性特有的系统共生体传输的生态和进化意义进行了讨论。(c)2005年，欧洲微生物学会联合会。Elsevier B. V.出版，保留所有权利。
In stinkbugs of the family Plataspidae, adult females deposit small brownish particles, containing specific symbiotic bacteria inside, on the underside of their egg mass. Newborn nymphs ingest the content of the unique structure, called "symbiont capsule", whereby vertical transmission of the symbiont occurs. We investigated the fine structure and the formation process of the symbiont capsule in the Japanese common plataspid stinkbug, Megaeopta punctatissima, by using light and electron microscopy. It was demonstrated that (i) the capsule consists of three structural components, namely "symbionts", "matrix" and "envelope"; (ii) the posterior midgut of adult females is characterized by several specific sections with peculiar anatomical traits, including "thin crypt-bearing midgut (TCM) section", "swollen crypt-bearing midgut (SCM) section" and "brownish enlarged midgut (BEM) end section"; (iii) the different capsule components, symbionts, matrix and envelope, are produced and/or supplied by the specialized midgut sections, TCM, SCM and BEM, respectively; and (iv) the capsule components are stored in BEM and excreted during oviposition to produce the symbiont capsules. These results strongly suggested that the host insect incurs a substantial cost for the symbiont transmission. Ecological and evolutionary implications of the highly developed, female-specific system for symbiont transmission were discussed. (c) 2005 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.