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Plant and Cell Physiology, 1975, Vol. 16, No. 2 313-326
© 1975

Article

Formation and division of giant mitochondria during the cell cycle of Euglena gracilis Z in synchronous culture I. Some characteristics of changes in the morphology of mitochondria and oxygen-uptake activity of cells1

Tetsuaki Osafunea,b, Sayoko Miharab, Eiji Haseb and Isamu Ohkuroa

aDepartment of Microbiology, Tokyo Medical College Shinjuku-ku, Tokyo 160
bInstitute of Applied Microbiology, University of Tokyo Bunkyo-ku, Tokyo 113, Japan

Changes in the morphology of mitochondria of Euglena gracilis Z cells were followed with an electron microscope during the cell cycle in a synchronous culture under photoautotrophic conditions. Giant mitochondria were temporarily formed, most probably by fusion of smaller forms, in the cells at an intermediate stage in the growth phase of the cell cycle. Formation of the giant mitochondria was accompanied by a striking decrease in the oxygen-uptake activity of the cells, and the division of giant mitochondria into smaller forms by a re-increase in the activity.

1 This work was reported in part at the 28th Annual Meeting of the Japanese Society of Electron Microscopy, May 1972.

(Received November 8, 1973; )
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