A histochemical and ultrastructural study of oogenesis in Aristaeomorpha foliacea (Risso, 1827)

被引:11
|
作者
Desantis, S
Labate, M
Maiorano, P
Tursi, A
Labate, GM
Ciccarelli, M
机构
[1] Univ Bari, Dept Zool, I-70125 Bari, Italy
[2] Univ Bari, Dept Anim Prod, I-70125 Bari, Italy
关键词
Crustacea; shrimp; Aristaeomorpha; oogenesis; histochemistry; ultrastructure;
D O I
10.1023/A:1017519320722
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Ovaries from mature giant red shrimp Aristaeomorpha foliacea were investigated histochemically and ultrastructurally. Four growing stages of the oocytes were distinguished: premeiosis stage, previtellogenetic stage, early vitellogenic stage and late vitellogenic stage. In addition, occasional resorptive oocytes were found. Oogonia and premeiotic oocytes were found in germinative zones. Previtellogenic and vitellogenic oocytes were localized in maturative zones. As vitellogenesis proceeded, oocytes showed a progressive development in the number of lipid droplets as well as in the extension of RER, constituted of dilated cisternae, uniformely scattered throughout the cytoplasm. The RER produced yolk granules and a lampbrush-like substance. The latter was released under the oolemma and constituted a characteristic cortical zone. The oolemma did not develop microvilli or micropinocytotic vesicles to incorporate yolk precursors. Thus, the protein yolk appeared to be of endogenous origin. Few somatic cells were found around the oocytes, but they never gave place to a continuous epithelial layer around oocytes, thus it is not possible to speak of ovarian follicle. The cytoplasm of these mesodermal-oocyte associated cells (MOAC) was characterized by a typical steroidogenic apparatus. Few resorptive immature oocytes were found inside late vitellogenic oocytes. Since the ovaries were packed with late vitellogenic oocytes and the few immature oocytes were hardly detectable, oocyte maturation occurred in a synchronous way.
引用
收藏
页码:253 / 259
页数:7
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