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Plant and Cell Physiology, 1982, Vol. 23, No. 5 813-820
© 1982

Article

Correlation between the Starch Level and the Rate of Starch Synthesis during the Developmental Cycle of Chlorella ellipsoidea

Toyoyasu Hirokawa1, Masayoshi Hata1,3 and Hiroshi Takeda

1Department of Biology, Faculty of Science, Niigata University Niigata 950-21, Japan
2Department of Biology, College of General Education, Niigata University Niigata 950-21, Japan

The starch content as well as the rate of photosynthetic starch formation in Chlorella ellipsoidea was studied throughout the cell cycle. The starch level in Chlorella cells rose markedly during the growing phase in the light, but it started to decrease after about 14 to 16 hr regardless of illumination. The rate of starch synthesis, measured by the level of 14C-incorporation into starch, increased rapidly in the growing phase until 10 hr, and decreased promptly thereafter, even in the light.

From these results, it was concluded that both the cellular level of starch and the rate of starch synthesis were a function not only of the light regime, but also of the stage of cell development.

3 Present address: Yamada High School, Yamada-machi, Iwate Pref. 028-13, Japan.

(Received October 12, 1981; Accepted May 12, 1982)
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