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Plant and Cell Physiology, 1986, Vol. 27, No. 8 1423-1427
© 1986

Article

Changes in the Productivity and Nuclear Divisions in Synchronous Chlorella and Circadian Rhythm

Pei-Chung Chen1 and Harald Lorenzen2

Department of Plant Physiology, University of Göttingen D-3400 Göttingen, F.R.G.

2To whom all correspondence should be addressed.

Circadian rhythmic changes of cell production were found at the end of a test cycle (LD 14 : 10 h) and the synthetic tendencies during the test cycle were examined. The rates but not the duration of syntheses of chlorophyll, DNA and soluble protein rhythmically changed with additional waiting time in the dark after a growth cycle (LD 14 : 10). Changes in the rates of RNA and total protein synthesis were apparent only during the first 9 h in the light phase of the test cycle. However, the rate of carbohydrate synthesis during the test cycle was completely different; an exponential pattern was observed in cells with 0 and 24 h waiting times, but a sigmoid one in cells with 12 h waiting time. Nuclear divisions (into 16 or even more) followed DNA synthesis. Cells with 12 h waiting time remained longer in each multinuclear phase (demonstrated by the 2 and 8 states) and showed extremely lowered productivity (ca. 50% only).

1Department of Botany, National Chung Hsing University, Taichung, Taiwan, Republic of China.

(Received May 14, 1985; Accepted June 14, 1986)
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