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Plant Physiology 65:631-634 (1980)
© 1980 American Society of Plant Biologists

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Articles

Effect of Light on Glucose Utilization by Euglena gracilis

Paul Nicolas, Georges Freyssinet and Victor Nigon

Département de Biologie Générale et Appliquée, Université Lyon I, 69622 Villeurbanne, Cédex, France, Laboratoire Associé au Centre National de la Recherche Scientifique, Université Lyon I, 69622 Villeurbanne, Cédex, France

The effect of light on glucose consumption by wild-type Euglena gracilis Z. and mutant cells has been studied. When dark- or light-grown wild-type cells are transferred from a medium containing sodium butyrate as the only carbon source to a glucose-containing medium, glucose consumption is blocked for 6 to 7 days when cultures are incubated under a light intensity of at least 600 lux. During this time cells multiply at the same rate as controls kept on media devoid of any utilizable organic carbon source. This light-induced inhibition of glucose consumption and of growth on glucose-containing medium is not related to photosynthesis since: (a) glucose consumption is inhibited by light intensities much lower than those required for high phototrophic growth; (b) the inhibition of photosynthesis by 3-(3,4-dichlorophenyl)-1, 1-dimethylurea does not overcome the inhibition of glucose consumption; and (c) nonphototrophic-growing mutants also show light-induced inhibition of glucose consumption and of growth on glucose-containing medium. This inhibition of growth by light might be explained by modification in the permeability of the cellular membrane.






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Copyright © 1980 by the American Society of Plant Biologists