莱氏拟乌贼成体副缠卵腺超显微结构

Ultrastructure of the accessory nidamental gland of adult Sepioteuthis lessoniana

摘要:

为揭示莱氏拟乌贼（Sepioteuthis lessoniana）成体副缠卵腺的结构和功能，利用组织学和透射电镜技术，对其副缠卵腺的超显微结构进行研究。结果显示：副缠卵腺由腺壁组织、腺体小管和结缔组织组成，其中腺壁组织由柱状上皮细胞和肌肉细胞组成；腺体小管由单层上皮细胞环绕构成，上皮细胞内细胞器数量丰富，包括线粒体、内质网和高尔基复合体等，管道数量众多且排列紧密，在管腔中可见大量杆状细菌和上皮细胞的分泌物质，管腔内壁着生微绒毛和纤毛；腺体小管外布满结缔组织，其中分布着少量血管和肌纤维。分析认为，莱氏拟乌贼副缠卵腺属于分泌型腺体，分泌物质包括形成卵鞘的凝胶状物质和为共生菌提供营养的物质；共生菌来源属于“水平传递”，其分泌物质具有抗菌活性。

Abstract:

The methodologies of histology and transmission electron microscopy were applied to understand the histological structure and cell type of the accessory nidamental gland (ANG) of adult Sepioteuthis lessoniana, a common species among cephalopods.The results showed that ANG was composed of parietal glandular tissue, glandular tubules and connective tissue.Among them, the parietal glandular tissue was composed of columnar epithelial cells and muscle cells. Glandular tubules were surrounded by monolayer epithelial cells, in which there were abundant organelles including mitochondria, endoplasmic reticulum and golgi complex, etc. Glandular glands were numerous and densely packed.There were a large number of rod-shaped bacteria and secreted substances in the lumen. The space between the gland tubules is filled with connective tissue, in which there were a few blood vessels and muscle fibers. Accordingly, the ANG of S. lessoniana is a secretory gland,the secreted substances include gel-like substances that form egg sheaths and substances that provide nutrients for symbiotic bacteria. The source of symbiotic bacteria belongs to “horizontal transmission”, and its secreted substances have antibacterial activity.