Effect of Light on Glucose Utilization by Euglena gracilis
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.
ACESSO AO ARTIGOhttp://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=440397
- Purification and properties of a light-inducible nuclease from Euglena gracilis.
- Heterotrophic cultivation of Euglena gracilis on chemically pretreated media
- Chloroplast RNA Populations in Dark-Grown, Light-Grown, and Greening Euglena gracilis
- Synthesis of Proteins by Isolated Euglena gracilis Chloroplasts 1
- Mutagenic Action of Nitrofurans on Euglena gracilis and Mycobacterium phlei