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KMID : 0368419900330030203
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Journal of Plant Biology
1990 Volume.33 No. 3 p.203 ~ p.209
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Effect of Light Quality on the Photorespiration in Pisum sativum L.
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Lee, Sun Hi/李舜熙
Kim, Seong Jong/Motoki Ikeda/金聖宗/池田元輝
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Abstract
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Effects of blue and red light on photorespiration in the leaf disks of pea were studied. The rate of total ^14CO_2 fixation was more or less higher under red light than blue light irradiation of the same quantum (94.8 μEm^-2·S^-1/mV). The release of ^14CO_2 by photorespiration was more stimulated under blue than red light. Among the photorespiratory intermediates, ^14C was more incorporated into serine under blue light than red light. However, ^14C was more incorporated into glycine under red light than blue light. The incorporation of ^14C into glycolate was very low under both light qualities, but higher under red light than blue light. Among the enzymes related to photorespiration, only glycolate oxidase was activated and/or synthesized by blue light irradiation. Moreover, more ^14CO_2 was released from glycoate-1-^14C under blue light than red light irradiation, but ^14CO_2 release from glyoxylate-1-^14C and glycine-1-^14C showed no difference by the either light qualities. These results suggest that blue light is more effective in the photorespiratory CO_2 evolution than red light. The reason is considered that glycolate is easily metabolized under blue light due to the stimulation of the glycolated oxidase activity.
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