Redescription of Microsporidium takedai (Awakura, 1974) as Kabatana takedai (Awakura, 1974) comb. n.

Diseases of Aquatic Organisms

Shigehiko Urawa¹  Frank Nilsen¹  Jirí Lom¹ 

关键词: Microsporidium takedai;    Kabatana takedai;    Microsporidia;    Ultrastructure;    SSU rRNA phylogeny · Oncorhynchus mykiss;   

DOI  :  10.3354/dao044223

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Ultrastructural study of the microsporidian Microsporidium takedai from the muscles of masu salmon Oncorhynchus masou proved that this species can be assigned to the genus Kabatana Lom, Dyková and Tonguthai, 2000. Theparasites develop within disintegrated sarcoplasm without any delimiting boundary or cyst. Cylindrical multinucleate meronts proliferate by serial constrictions into uninucleate stages which repeat the process. Eventually, the uninucleate stages transforminto uninucleate sporonts, which divide once to produce sporoblasts, thus functioning as sporoblast mother cells. Spores, with a subterminally located anchoring disc and 3 to 4 turns of the polar tube coil, average 3.3 by 1.9 µm in size. The exospore isdivided into small fields; the endospore frequently makes small invaginations into the spore inside. Phylogenetic analysis using SSU rDNA sequence consistently placed Kabatana takedai in a group consisting of Microgemma sp., Spraguealophii and Glugea americanus. The K. takedai could easily be separated from the other species in the same group by 2 inserts in the SSU rDNA sequence.

【 授权许可】

Unknown