The journey of squid sperm
The journey of squid sperm
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鱿鱼精子的旅程
DOI：
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发表时间：
2018
影响因子：
6.2
通讯作者：
W. Gilly
中科院分区：
文献类型：
--
作者：
F. Fernández;R. Villanueva;H. Hoving;W. Gilly
精子储存在体内受精动物中很常见，但也存在于几种体外受精动物中，例如许多头足类动物。头足类雄性在交配过程中将精子包（精囊）附在雌性同种身上。占头足类生物多样性 25% 的 8 个体外受精科的雌性在其颊区具有精子储存器官（精容器），这些器官与沉积的精囊没有直接的物理接触。精子在植入部位和储存器官之间传输的机制仍然是头足类生殖生物学的一个重大谜团。在这里，巨型雌性鱿鱼几乎覆盖了从未成熟到实验室产卵雌性的整个生命周期，被用来描述受精容器的内部结构和精子储存的过程。精液存在于精囊和精囊之间，但在没有精囊的区域中不存在。精子细胞成分由精子和圆形细胞组成。尽管精子可以通过雌性的颊膜追踪到精容器的内室，但在精容器内没有发现圆形细胞，这表明精子没有被精容器的肌肉作用吸走。这一发现支持了精子能够在女性皮肤上主动迁移的假设。尽管需要进一步的实验支持来充分证实这一假设，但我们的发现揭示了许多头足类动物难以捉摸的精子储存过程，这一过程对于理解海洋中的性选择至关重要。
Sperm storage is common in internally fertilizing animals, but is also present in several external fertilizers, such as many cephalopods. Cephalopod males attach sperm packets (spermatangia) to female conspecifics during mating. Females of eight externally fertilizing families comprising 25% of cephalopod biodiversity have sperm-storage organs (seminal receptacles) in their buccal area, which are not in direct physical contact with the deposited spermatangia. The mechanism of sperm transmission between the implantation site and the storage organ has remained a major mystery in cephalopod reproductive biology. Here, jumbo squid females covering almost the entire life cycle, from immature to a laboratory spawned female, were used to describe the internal structure of the seminal receptacles and the process of sperm storage. Seminal fluid was present between the spermatangia and seminal receptacles, but absent in regions devoid of seminal receptacles. The sperm cellular component was formed by spermatozoa and round cells. Although spermatozoa were tracked over the buccal membrane of the females to the inner chambers of the seminal receptacles, round cells were not found inside the seminal receptacles, suggesting that spermatozoa are not sucked up by the muscular action of the seminal receptacles. This finding supports the hypothesis that spermatozoa are able to actively migrate over the female skin. Although further experimental support is needed to fully confirm this hypothesis, our findings shed light on the elusive process of sperm storage in many cephalopods, a process that is fundamental for understanding sexual selection in the sea.
影响因子：
2.4
作者：
Fiorito, Graziano;Affuso, Andrea;Andrews, Paul L. R.
通讯作者：
Andrews, Paul L. R.