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Plant and Cell Physiology, 1970, Vol. 11, No. 4 663-673
© 1970

Article

Studies on chlorophyll formation in Chlorella protothecoides I. Enhancing effects of light and added {delta}-aminoIevulinic acid, and suppressive effect of glucose on chlorophyll formation

SONOE OCHIAI and EIJI HASE

Institute of Applied Microbiology, University of Tokyo Tokyo, Japan

Light-induced formation of chlorophyll in "etiolated" cells of Chlorella protothecoides was studied under various experimental conditions, (i) Two different types of enhancing effect of light were demonstrated: a "long-term" effect lasting for many hours after a relatively short illumination of etiolated cells and a "short-term" effect disappearing in a few hours after illumination, (ii) Addition of ALA caused enhancement of chlorophyll synthesis in etiolated cells in darkness as well as in light; the ALA-enhanced rate of dark chlorophyll synthesis, however, was much lower than the rate in light without added ALA. ALA was replaceable with succinic acid plus glycine in light, but not in the dark, for enhancement of chlorophyll formation, (iii) Adding glucose, fructose, galactose, glycerol or acetate—at concentrations much lower than those previously shown to induce "bleaching" of green algal cells-caused a more or less marked suppression of light-induced greening in etiolated cells, (iv) Added glucose almost instantaneously and completely stopped chlorophyll synthesis in light as well as in darkness either with or without added ALA. On the basis of these and other results, a tentative scheme is presented for the enhancing effects of light and the suppressive effects of glucose on chlorophyll formation in algal cells.

(Received April 1, 1970; )
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