Prokaryote infections in the New Zealand scallops Pecten novaezelandiae and Chlamys delicatula

Diseases of Aquatic Organisms

B. K. Diggles¹  P. M. Hine¹ 

关键词: Scallops;    Pecten;    Chlamys;    Digestive epithelium;    Branchial epithelium;    Haemocytes;    Rickettsias;    Mollicutes;    Mycoplasmas;    Tip structure;    Ultrastructure;   

DOI  :  10.3354/dao050137

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Four intracellular prokaryotes are reported from the scallops Pecten novaezelandiae Reeve, 1853 and Chlamys delicatula Hutton, 1873. Elongated (1025 x 110 nm), irregular (390× 200 nm), or toroidal (410 x 200 nm) mollicute-like organisms (M-LOs) occurred free in the cytoplasm in the digestive diverticular epithelial cells of both scallop species. Those in P. novaezelandiaebore osmiophilic blebs that sometimes connected the organisms together, and some had a rod-like protrusion, both of which resemble the blebs and tip structures of pathogenic mycoplasmas. The M-LOs in C. delicatula had a slightly densercore than periphery. Round M-LOs, 335 x 170 nm, occurred free in the cytoplasm of agranular haemocytes in P. novaezelandiae, without apparent harm to the host cell. In P. novaezelandiae, 2 types of highly prevalent(95 to 100%) basophilic inclusions in the branchial epithelium contained Rickettsia-like organisms (R-LOs). Type 1 inclusions occurred in moderately hypertrophied, intensely basophilic cells, 8 to 10 µm in diameter, containing elongate intracellular RLOs, 2000 x 500 nm. Type 2 inclusions were elongated and moderately basophilic in markedly hypertrophic branchial epithelial cells, 50 x 20 µm in diameter, containing intracellular organisms 500× 200 nm in diameter. The possible roles of these organisms in pathogenesis is discussed.

【 授权许可】

Unknown