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Annals of Botany 39: 525-533, 1975
© 1975 Annals of Botany Company

RESEARCH-ARTICLE

Nucleic Acid Metabolism in Chlamydomonas moewusii Undergoing Daily Cell Doubling1

W. F. CLAY, K. MATSUDA, R. W. HOSHAW and PATSY R. RHODES

Department of Agronomy and Plant Genetics and Department of Biological Sciences University of Arizona Tucson, Arizona 85721, U.S.A.

Received: 14 June 1974   

Nucleic acid metabolism was studied in synchronized cultures (12 h light, 12 h dark) of Chlamydomonas moewusii Gerloff in which cell number approximately doubled each 24 h. Analysis for DNA showed a small but significant rise between 5 to 7 h and a major increase from 11 to 16 h after first exposure to light. Cellular RNA levels increased from 0·5 to 1·1 pg within 1 h after exposure to light, dropped after 2 h to a plateau value of about 0·9 pg, declined from the 10th to the 17th hour, and subsequently increased a second time during the dark period. Investigations using gel electrophoresis showed that RNAs of chloroplastic ribosomes were only a minor component in extracts obtained in the first 8 h of light. It is suggested that the time of initiation of synthesis and degradation as well as the nature and amounts of nucleic acids produced in Chlamydomonas are regulated by conditions of growth.


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