Morula-Like Cells in Photo-Symbiotic Clams Harboring Zooxanthellae
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概要
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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-sumbiotic 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 μm 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 clam 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 μm 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 vaculoes and a few large granules containing peroxidase activity was observed. The large granules of F.mutica varied in size from ca.1-9 μm in diameter. Present data suggests that the presence of morula-like cells is restricted to photo-symbiotic clams and that the henocytes associated with the morula-like cells may have some functional relationship to symbiosis with zooxanthellae.
- 社団法人日本動物学会の論文
著者
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Maruyama Tadashi
Marine Biotechnology Institute Co., Ltd
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NISHIJIMA Miyuki
Shimizu Laboratories, Marine Biotechnology Institute
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Maruyama Tadashi
Marine Biotechnology Institute Co. Ltd:(present Address) Japan Marine Science & Technology Cente
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Nishijima Miyuki
Shimizu Laboratories
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Nakayama Koji
Marine Biotechnology Institute Kamaishi Laboratories
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Maruyama Tadashi
Marine Biotechnology Institute Kamaishi Laboratories
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Maruyama Tadashi
Marine Biotechnology Institute
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