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. 1982 Jan;69(1):19-22.
doi: 10.1104/pp.69.1.19.

Catabolism of 5-Aminolevulinic Acid to CO(2) by Etiolated Barley Leaves

J X Duggan  1 , E Meller, M L Gassman
Affiliations

Catabolism of 5-Aminolevulinic Acid to CO(2) by Etiolated Barley Leaves

J X Duggan et al. Plant Physiol. 1982 Jan.

Abstract

The in vivo oxidation of the C(4) and C(5) of 5-aminolevulinic acid (ALA) to CO(2) has been studied in etiolated barley (Hordeum vulgare L. var. Larker) leaves in darkness. The rate of (14)CO(2) evolution from leaves fed [4-(14)C]ALA is strongly inhibited by aminooxyacetate, anaerobiosis, and malonate. The rate of (14)CO(2) evolution from leaves fed [5-(14)C]ALA is also inhibited by these treatments but to a lesser extent. These results suggest that (a) one step in ALA catabolism is a transamination reaction and (b) the C(4) is oxidized to CO(2) via the tricarboxylic acid cycle to a greater extent than is the C(5).

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