EMBRYONIC-DEVELOPMENT OF THE LIGHT ORGAN OF THE SEPIOLID SQUID EUPRYMNA-SCOLOPES BERRY
EMBRYONIC-DEVELOPMENT OF THE LIGHT ORGAN OF THE SEPIOLID SQUID EUPRYMNA-SCOLOPES BERRY
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DOI：
10.2307/1542448
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发表时间：
1993-06-01
影响因子：
1.6
通讯作者：
MCFALLNGAI, M
中科院分区：
文献类型：
--
作者：
MONTGOMERY, MK;MCFALLNGAI, M
鱿鱼在墨囊腹面部分嵌入的双叶发光器官中维持着费氏弧菌的发光细菌共生体。胚胎发生过程中对轻器官的解剖和超微结构观察表明，该器官的发育始于后肠-墨囊复合体的中胚层的成对增殖。一个刚孵化的幼鱼的早期光器官的三维重建显示了三对囊状隐窝的存在，每个隐窝通过纤毛管连接到光器官表面的一个孔。幼鱼孵化后数小时内，隐窝就充满了细菌共生体，这似乎是胚胎发生期间后肠-墨囊复合体表面上皮连续成对内陷的结果。一对前纤毛和一对后纤毛上皮附属物。这可能促进了共生细菌对早期光器官的感染，通过表面上皮的延伸和生长而发展。墨囊和反射器在隐窝的背面发育，并共同起着引导腹侧发光的作用。这两个附属组织在孵化时就存在，尽管它们的整体结构会随着光器官的生长和成熟而变化。第三个附属组织，肌肉来源的晶状体，在光器官孵化成熟后出现。
The sepiolid squid Euprymna scolopes maintains luminous bacterial symbionts of the species Vibrio fischeri in a bilobed light organ partially embedded in the ventral surface of the ink sac. Anatomical and ultrastructural observations of the light organ during embryogenesis indicate that the organ begins development as a paired proliferation of the mesoderm of the hindgut-ink sac complex. Three-dimensional reconstruction of the incipient light organ of a newly hatched juvenile revealed the presence of three pairs of sacculate crypts, each crypt joined to a pore on the surface of the light organ by a ciliated duct. The crypts, which become populated with bacterial symbionts within hours after the juvenile hatches, appear to result from sequential paired invaginations of the surface epithelium of the hindgut-ink sac complex during embryogenesis. A pair of anterior and a pair of posterior ciliated epithelial appendages. which may facilitate infection of the incipient light organ with symbiotic bacteria, develop by extension and growth of the surface epithelium. The ink sac and reflector develop dorsal to the crypts and together function to direct luminescence ventrally. These two accessory tissues are present at the time of hatching, although changes in their overall structure accompany growth and maturation of the light organ. A third accessory tissue, the muscle-derived lens, appears during post-hatch maturation of the light organ.