Davy Simon K, Turner John R
Institute of Marine Studies, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK.
Biol Bull. 2003 Aug;205(1):66-72. doi: 10.2307/1543446.
The ova of Anthopleura ballii become infected with zooxanthellae (endosymbiotic dinoflagellates) of maternal origin just prior to spawning. After fertilization, the zygotes undergo radial, holoblastic cleavage, and then gastrulate by invagination to form ciliated planulae. Because the zooxanthellae are localized on one side of the ovum-and later, within the blastomeres at one end of the embryo-invagination leads to the zooxanthellae being restricted to the planular endoderm and hence to the gastrodermal cells of the adult anemone. We propose that maternal inheritance of zooxanthellae plays an important part in the success of these temperate sea anemones, which live in regions where potential sources of zooxanthellae are scarce.
巴氏列指海葵（Anthopleura ballii）的卵在即将产卵前会被源自母体的虫黄藻（内共生甲藻）感染。受精后，受精卵进行辐射全裂，然后通过内陷形成原肠胚，进而发育成具纤毛的浮浪幼虫。由于虫黄藻定位于卵的一侧，随后位于胚胎一端的卵裂球内，内陷导致虫黄藻局限于浮浪幼虫的内胚层，进而局限于成年海葵的胃皮细胞。我们认为，虫黄藻的母系遗传在这些温带海葵的生存成功中起着重要作用，因为它们生活在虫黄藻潜在来源稀缺的地区。
