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首页> 外文期刊>Marine biology >Changes in gonadal development, androgenic gland cell structure, and hemolymph vitellogenin levels during male phase and sex change in laboratory-maintained protandric shrimp, Pandalus hypsinotus (Crustacea: Caridea: Pandalidae)
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Changes in gonadal development, androgenic gland cell structure, and hemolymph vitellogenin levels during male phase and sex change in laboratory-maintained protandric shrimp, Pandalus hypsinotus (Crustacea: Caridea: Pandalidae)

机译:实验室维持的原虾Pandalus hypsinotus(甲壳纲:Caridea:Pandalidae)在雄性阶段的性腺发育,雄性腺细胞结构和血淋巴卵黄蛋白原水平的变化以及性别变化。

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摘要

Most pandalid shrimps show protandric her-maphroditism, and male sexual differentiation is considered to be controlled by the androgenic gland. In the present study, we examined the histology of gonadal development during the male phase and sex change and the involvement of the androgenic gland in regulating male reproduction in laboratory-maintained Pandalus hypsinotus. Juvenile shrimps developed testicular tissues in the peripheral part of gonads during the age of 16-31 months and produced spermatozoa between 34 and 36 months. After reaching sexual maturity, male shrimps exhibited seasonal testicular development: active production of spermatozoa (February-May), disappearance of spermatozoa (spent, April-June), increase of spermatocytes (May-November), appearance of spermatids and spermatozoa in the gonads (November-February). The androgenic gland cells became larger and the rough endoplasmic reticulum in the cytoplasm developed at male sexual maturity. The cell structure shows that the androgenic gland hormone is a peptide. Furthermore, bilateral eyestalk ablation on immature male shrimps induced hypertrophy of the androgenic gland and acceleration of male sexual maturation. These results indicate the involvement of androgenic gland hormone and some eyestalk factor in regulating male sexual maturation. Over a 1-year laboratory-rearing period, some male shrimps (16.7%) changed sex. In transitional shrimps, testicular tissues in the gonads and androgenic glands degenerated; on the other hand, oocytes started yolk protein accumulation and hemolymph vitellogenin levels became high. These results suggest that androgenic gland degeneration is a trigger for sex change and that the vitellogenin level is a useful marker for sex change.
机译:大多数pan虾表现出原性雌雄同体性生殖,并且认为雄性分化受雄激素腺控制。在本研究中,我们检查了雄性阶段和性别变化期间性腺发育的组织学,以及雄激素腺参与调节实验室维持的Pandalus hypsinotus雄性生殖的过程。幼虾在16-31个月大时会在性腺的外围发育出睾丸组织,并在34到36个月时产生精子。达到性成熟后,雄性虾表现出季节性睾丸发育:精子活跃生产(2月至5月),精子消失(4月至6月消耗),精子细胞增加(5月至11月),性腺中精子和精子的出现(11月-2月)。在雄性成熟时,雄激素腺细胞变大,细胞质中的粗面内质网形成。细胞结构表明雄激素激素是一种肽。此外,未成熟雄性虾的双侧眼柄消融诱导雄激素腺肥大,并促进雄性成熟。这些结果表明雄激素腺激素和一些眼神因素参与调节男性性成熟。在为期1年的实验室饲养期间,一些雄虾(16.7%)改变了性别。在过渡虾中,性腺和雄性腺的睾丸组织退化。另一方面,卵母细胞开始卵黄蛋白积聚,血淋巴卵黄蛋白原水平升高。这些结果表明,雄激素腺变性是性别变化的诱因,而卵黄蛋白原水平是性别变化的有用标志。

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