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Plant and Cell Physiology, 1981, Vol. 22, No. 5 747-757
© 1981

Article

Role of Light in 5-Aminolevulinic Acid Formation in Wild Strain and Mutant C-2A' Cells of Scenedesmus obliquus

Tamiko Oh-hama and Eiji Hase1

The Institute of Applied Microbiology, The University of Tokyo Bunkyo-ku, Tokyo 113, Japan

In dark-grown wild strain cells of Scenedesmus obliquus, 5-aminolevulinic acid (ALA) formation was induced by irradiation with a weak blue light, as in its mutant C-2A' cells. The induction was inhibited by distamycin A, 6-methylpurine, cycloheximide and chloramphenicol. After the light induction, the ALA formation could proceed in the dark as well as in the light, in such heterotrophically grown wild type cells, but not in the greening mutant C-2A' cells. In the latter, ALA formation was dependent on red light, as well as on blue light, in the presence of CMU. The amounts of protochlorophyll in the mutant cells increased upon cessation of illumination and decreased with subsequent irradiation with blue and red light. The possible role of protochlorophyll as a photoreceptor in regulation of ALA formation in the mutant cells is discussed.

1Present address: Laboratory of Chemistry, Faculty of Medicine, Teikyo University, Otuka, Hachioji, Tokyo 192-03, Japan.

(Received January 17, 1981; Accepted April 30, 1981)
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