Bloodgood R A
Tissue Cell. 1977;9(2):197-208. doi: 10.1016/0040-8166(77)90016-7.
The structure of the accessory nidamental gland of the female squid, Loligo pealei, has been investigated using transmission and scanning electron microscopy. The accessory gland has many of the structural features of a secretory organ. The basic structural unit is a tubule composed of a single layer of epithelial cells containing ordered arrays of rough endoplasmic reticulum and a lumenal surface covered with microvilli, cilia, and structural specialization presumed to be involved in secretion. The lumen of each tubule is filled with a dense population of bacteria. During sexual maturation of the squid, the accessory gland changes in color from white to mottled red. The accessory gland of the sexually mature squid has a mixture of red, white, and yellow tubules; in each case, the color of the tubule is due to the bacterial population occupying the tubule. Since the red color of the gland is due to the pigmentation of the bacteria, the bacteria must be responsive to the sexual state of the host, possible through a change in the nature of the material secreted into the tubule lumen. The bacteria can be cultured easily. but in culture they fail to synthesize the red pigment.
利用透射电子显微镜和扫描电子显微镜对雌性皮氏枪乌贼（Loligo pealei）的副缠卵腺结构进行了研究。副腺具有分泌器官的许多结构特征。基本结构单位是小管，由单层上皮细胞组成，这些上皮细胞含有排列有序的粗面内质网，管腔表面覆盖有微绒毛、纤毛以及推测与分泌有关的结构特化。每个小管的管腔内充满了大量细菌。在鱿鱼性成熟过程中，副腺颜色从白色变为斑驳的红色。性成熟鱿鱼的副腺有红色、白色和黄色小管的混合物；在每种情况下，小管的颜色是由于占据小管的细菌群体所致。由于腺体的红色是由于细菌的色素沉着，细菌必定对宿主的性状态有反应，可能是通过分泌到小管腔中的物质性质的变化。这些细菌易于培养，但在培养过程中它们无法合成红色色素。
