Metamorphosis and acquisition of symbiotic algae in planula larvae and primary polyps of Acropora spp.
Metamorphosis and acquisition of symbiotic algae in planula larvae and primary polyps of Acropora spp.
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DOI：
10.1007/s00338-007-0330-y
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发表时间：
2008-06-01
期刊：
影响因子：
3.5
通讯作者：
Nonaka, M.
中科院分区：
文献类型：
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作者：
Hirose, M.;Yamamoto, H.;Nonaka, M.
珊瑚浮浪沉淀下来，然后变质形成珊瑚虫。本研究探讨了形态的变形过程中，从planulae到初级息肉的石珊瑚Acropora nobilis和Acropora microphthalma，使用刺胞动物神经肽Hym-248。这两个物种释放的卵不含共生藻。还检查了由非共生息肉获得新鲜分离的共生藻（虫黄藻）（FIZ）的模式。非Hym-248处理的游动型扁平鹿角珊瑚在受精后16天诱导变态前不发育囊胚孔、系膜或腔肠。口孔是在变态息肉的腔肠形成后，表皮层内陷形成的。在3天后的解决和变态，初级息肉暴露于FIZ建立共生与共生藻。暴露于FIZ后2 - 4天，共生藻的分布仅限于咽部的胃真皮和息肉的基底部分。暴露于FIZ后8 - 10天，在整个息肉的胃胚层细胞中存在共生碘。
Coral planulae settle, then metamorphose and form polyps. This study examined the morphological process of metamorphosis from planulae into primary polyps in the scleractinian corals Acropora nobilis and Acropora microphthalma, using the cnidarian neuropeptide Hym-248. These two species release eggs that do not contain Symbiodinium. The mode of acquisition of freshly isolated Symbiodinium (zooxanthellae) (FIZ) by the non-symbiotic polyp was also examined. Non-Hym-248 treated swimming Acropora planulae did not develop blastopore, mesenteries or coelenteron until the induction of metamorphosis 16 days after fertilization. The oral pore was formed by invagination of the epidermal layer after formation of the coelenteron in metamorphosing polyps. At 3 days after settlement and metamorphosis, primary polyps exposed to FIZ established symbioses with the Symbiodinium. Two-four days after exposure to FIZ, the distribution of Symbiodinium was limited to the gastrodermis of the pharynx and basal part of the polyps. Eight-ten days after exposure to FIZ, Symbiodinium were present in gastrodermal cells throughout the polyps.