Author:
Krupka R. M.,Towers G. H. N.
Abstract
In order to determine the metabolic origin of glyoxylate 12 different carbon-14 labelled compounds, including sugars, organic acids, and amino acids, were fed to wheat tissue. With the exception of glycine none gave rise to glyoxylate. The labelling from glycine was slight and could not have accounted for the large amounts of glyoxylate in the tissue. Of a number of inactive compounds fed to degrained seedlings only allantoin induced an increase in the concentration of glyoxylate. A nitrogen atmosphere was found to increase the content of glyoxylate while decreasing that of allantoin. Allantoin-C14 was synthesized much more readily from glycine-C14 than from glyoxylate-C14. When seedlings previously fed glycine-C14 in air were transferred to nitrogen, considerable radioactivity appeared in glyoxylate. These results suggest that glycine is a precursor and glyoxylic acid a hydrolysis product of allantoin.
Publisher
Canadian Science Publishing
Cited by
15 articles.
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