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Plant and Cell Physiology, 1970, Vol. 11, No. 3 411-416
© 1970

Article

Effects of disalicylidenepropandiamine and near far-red light on 14CO2-fixation in Chlorella cells

NORIKO OGASAWARA and SHIGETOH MIYACHI

Institute of Applied Microbiology, University of Tokyo and Tokugawa Institute for Biological Research Tokyo, Japan

1) With Chlorella ellipsoidea cells, in the presence of 5x10–6 M DSPD, or in its absence, the amounts of 14CO2 incorporated in P-esters, serine-plus-glycine and alanine were larger under red light than under blue light, whereas blue light specifically increased 14CO2-incorporation in aspartate, glutamate, malate and fumarate (blue light effect). The amount of total 14C fixed under blue or red light was greatly decreased by the addition of DSPD. When the concentration of DSPD was raised to 5x10–4 M, practically no radioactivity was found, under blue or red light, in aspartate, glutamate and fumarate. Radioactivity in alanine was greatly increased. Effects of higher concentration of DSPD are explained as due to the inhibition of PEP carboxylase activity in Chlorella cells.

2) The percentage incorporation of 14C into aspartate and the other compounds mentioned above, under near infra-red illumination was significantly smaller than that under blue light and was almost equal to that under red light. These results along with the effect of 5x10–6 M DSPD, exclude the possibility that cyclic photophosphorylation is involved in the "blue light effect" mechanism.

(Received December 12, 1969; )
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