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首页> 外文期刊>Arthropod Structure & Development >Development of ovary structures in the last larval and adult stages of psyllids (Insecta, Hemiptera, Sternorrhyncha: Psylloidea)
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Development of ovary structures in the last larval and adult stages of psyllids (Insecta, Hemiptera, Sternorrhyncha: Psylloidea)

机译：在木虱的最后幼虫期和成虫期的卵巢结构发育（昆虫纲，半翅目，Sternorrhyncha：Psylloidea）

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摘要

The development and organization of the ovaries of ten species from four Psylloidea families (Psyllidae, Triozidae, Aphalaridae and Liviidae) have been investigated. The ovaries of the last larval stage (i.e. fifth instar) of all examined species are filled with numerous clusters of cystocytes which undergo synchronous incomplete mitotic division. Cystocytes of the given cluster are arranged into a rosette with polyfusome in the centre. These clusters are associated with single somatic cells. At the end of the fifth instar, the clusters begin to separate from each other, forming spherical ovarioles which are surrounded by a single layer of somatic cells. In the ovarioles of very young females all cystocytes enter the prophase of meiosis and differentiate shortly thereafter into oocytes and trophocytes (nurse cells). Meanwhile, somatic cells differentiate into cells of the inner epithelial sheath surrounding the trophocytes and into the prefollicular cells that encompass the oocytes. During this final differentiation, the trophocytes lose their cell membranes and become syncytial. Oocytes remain cellular and most of them (termed arrested oocytes) do not grow. In the ovarioles of older females, one oocyte encompassed by its follicle cells starts growing, still connected to the syncytial tropharium by a nutritive cord. After the short phase of pre-vitellogenesis alone, the oocyte enters its vitellogenic the growth phase in the vitellarium. At that time, the second oocyte may enter the vitellarium and start its previtellogenic growth. In the light of the obtained results, the phylogeny of psyllids, as well as phylogenetic relationships between taxa of Hemiptera: Sternorrhyncha are discussed. (C) 2016 Elsevier Ltd. All rights reserved.
机译：已经研究了四个假单胞菌科（假单胞菌科，毛虫科，毛虫科和and科）的十种卵巢的发育和组织。所有受检物种的最后一个幼虫阶段（即第五龄）的卵巢中充满了许多囊细胞，这些细胞经历同步的不完全有丝分裂。给定簇的细胞被排列成一个玫瑰花环，中间有多聚体。这些簇与单个体细胞相关。在第五龄期结束时，各簇开始彼此分离，形成球形卵泡，卵泡被单层体细胞包围。在非常年轻的女性的卵巢中，所有的囊细胞都进入减数分裂的前期，并在此后不久分化为卵母细胞和滋养细胞（护士细胞）。同时，体细胞分化成围绕滋养细胞的内上皮鞘细胞和包围卵母细胞的前卵泡前细胞。在最终分化过程中，滋养细胞失去细胞膜并变得合胞体。卵母细胞保持细胞状态，其中大多数（称为被捕卵母细胞）不生长。在老年雌性的卵巢中，卵泡细胞所包围的一个卵母细胞开始生长，仍然通过营养索与合胞体的原核生物相连。仅在卵泡形成前的短暂阶段之后，卵母细胞就进入了卵黄质中的卵黄成长期。那时，第二个卵母细胞可能进入vi骨，并开始其成胎前的生长。根据获得的结果，讨论了木虱的系统发育以及半翅目：Sternorrhyncha类群之间的系统发生关系。 （C）2016 Elsevier Ltd.保留所有权利。

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