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Articles

Gene Locus Specificity of the Glucose Effect in the Thiamine Pathway of the Angiosperm, Arabidopsis^1,2

^a Department of Genetics, University of Missouri, Columbia, Missouri 65201

All mutants at 3 loci in Arabidopsis thaliana (L.) Heynh., a higher plant, that are associated with the synthesis or coupling of the thiazole moiety of thiamine are susceptible to reversible glucose inhibition. In contrast, several different alleles involved in the synthesis of the pyrimidine moiety of the vitamin are insensitive to glucose. Glucose and maltose are equally effective inhibitors while fructose, lactose, ribose, and xylose are toxic. This toxicity is not released by added thiamine.

¹ Contribution from the Missouri Agricultural Experiment Station. Journal Series Number 5474. Approved by the Director.

² This work was supported by National Science Foundation Grant GB 6577 and United States Atomic Energy Commission Contract AT-(11-1)-1609.