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首页> 外文期刊>Zoological Science >Morula-like cells in photo-symbiotic clams harboring zooxanthellae
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Morula-like cells in photo-symbiotic clams harboring zooxanthellae

机译：带有虫黄藻的光共生蛤中的桑ula样细胞

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Symbiosis is observed between zooxanthellae, symbiotic dinoflagellates, and giant clams and related clams which belong to the families Tridacnidae and Cardiidae. We have previously shown that a photo-symbiotic clam Tridacna crocea has three types of hemocytes, the eosinophilic granular hemocyte with phagocytic activity, the agranular cell with electron lucent granules, and the morula-like cell with large (ca. 2 mu m in diameter) colorless granules. The function of the morula-like cell is not clear, but it has not been reported in any other bivalves except photo-symbiotic clams T. crocea and Tridacna maxima. In order to clarify whether it is specific to photo-symbiotic clams or not, we studied hemocytes in the photo-symbiotic clams Tridacna derasa (Tridacnidae), Hippopus hippopus (Tridacnidae) and Corculum cardissa (Cardiidae), and a closely related non-symbiotic dam Fulvia mutica (Cardiidae). The eosinophilic granular hemocytes and the agranular cells were found in all of the clams examined. However, the morula-like cells which were packed with many large electron dense granules (ca. 2 mu m in diameter), were observed only in the photosymbiotic clams. In F. mutica, a closely related non-symbiotic clam, this type of hemocyte was not found. Instead a hemocyte with vacuoles and a few large granules containing peroxidase activity was observed. The large granules of F. mutica varied in size from ca. 1-9 mu m in diameter. Present data suggests that the presence of morula-like cells is restricted to photo-symbiotic clams and that the hemocytes associated with the morula-like cells may have some functional relationship to symbiosis with zooxanthellae.
机译：虫黄藻，共生鞭毛虫与巨Tri和相关蛤c之间的共生被观察到，这些蛤Tri和Tri蛤属于Tri科和Card科。我们以前已经证明了一种具有光共生性的蛤Tri Tridacna crocea具有三种类型的血细胞：具有吞噬活性的嗜酸性粒状血细胞，具有电子透明颗粒的粒状细胞和具有大（直径约2微米）的桑ula样细胞。 ）无色颗粒。桑ula样细胞的功能尚不清楚，但除光合共生蛤T，大丁鱼和巨蛤外，其他双壳类动物均未见报道。为了阐明它是否对光共生蛤特定，我们研究了光共生蛤中的血细胞Tridacna derasa（Tridacnidae），Hippopus hippopus（Tridacnidae）和Corculum cardissa（Cardiidae）以及密切相关的非共生蛤大坝Fulvia mutica（Cardiidae）。在所有检查过的蛤中都发现了嗜酸性粒状血细胞和粒状细胞。然而，仅在光共生蛤中观察到装有许多大的电子致密颗粒（直径约2微米）的桑ula样细胞。在F. mutica（一种密切相关的非共生蛤）中，未发现这种类型的血细胞。相反，观察到具有空泡的血细胞和一些含有过氧化物酶活性的大颗粒。 F. mutica的大颗粒的大小从大约直径1-9微米。目前的数据表明桑样细胞的存在仅限于光共生蛤，并且与桑ula样细胞相关的血细胞可能与虫黄藻共生有一定的功能关系。

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