Abstract

Abstract Cinnamyl-CoA synthetase activity has been demonstrated in extracts of leaves of spinach beet ( Beta vulgaris L. ssp. vulgaris ) by direct spectrophotometric assay and by CoA-dependent formation of cinnamyl hydroxamate. These extracts also promoted a cinnamate-dependent incorporation of pyrophosphate into nucleotide phosphate, which was inhibited by CoA. The activity of extracts was affected by the age of the plants and leaves and by their growth conditions; it showed an inverse correlation with the accumulation of red pigment in the leaves. Measurable activity was also found in leaves from young plants of pea, runner bean and spinach.

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