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Journal of Electron Microscopy 47(3): 269-272 (1998)
© 1998 Oxford University Press

Identification of a triple ring structure involved in plastid division in the primitive red alga Cyanidioschyzon merolae

Shin-ya Miyagishima1,*, Ryuuichi Itoh1, Kyoko Toda1, Hidenori Takahashi1, Haruko Kuroiwa2 and Tsuneyoshi Kuroiwa1

1Department of Biological Sciences, Graduate School of Science, University of Tokyo Hongo, Tokyo 113-0033, Japan
2Kyoritsu Women's Junior College Kanda, Tokyo 101-0051, Japan

*To whom correspondence should be addressed

Detailed structures of the plastid-dividing ring (PD ring) and the mitochondrion-dividing ring (MD ring) of the primitive red alga Cyanidioschyzon merolae were examined by transmission electron microscopy (TEM). Cells were highly synchronized to observe accurately their structures. For the first time, TEM revealed a middle PD ring that lies between the inner and outer envelopes in addition to the outer ring on the cytoplasmic face of the outer envelope membrane and the inner ring on the stromal face of the inner envelope membrane. The PD ring of C. merolae is a triple ring structure, consisting of inner, middle and outer rings.

Keywords     Cyanidioschyzon merolae, mitochondrion-dividing ring (MD ring), plastid-dividing ring (PD ring), primitive eukaryote, triple ring structure

Received      9 January 1998, accepted 31 March 1998


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