Chloroplasts Isolated from Kidney Bean Leaves Are Capable of Phenolic Compound Biosynthesis

Chloroplasts Isolated from Kidney Bean Leaves Are Capable of Phenolic Compound Biosynthesis The homogenate and chloroplast fractions isolated from the leaves of 10–14-day-old kidney-bean (Phaseolus vulgaris L.) seedlings were incubated with 14C-L-phenylalanine for 30 min in the light, and the incorporation of radioactivity into phenolic compounds was determined. Label incorporation into phenolic compounds of the homogenate and chloroplast fractions amounted to 15–17 and 4–5% of the introduced radioactivity, respectively. The chloroplasts were about an order of magnitude higher than the homogenate in the specific radioactivity of phenolic compounds. Chloroplasts contained four flavonol glycosides (kaempferol and quercetin aglycones), which were the major components of soluble phenolic compounds of leaves. It was concluded that kidney-bean leaf chloroplasts were capable of performing phenolic compound biosynthesis. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Chloroplasts Isolated from Kidney Bean Leaves Are Capable of Phenolic Compound Biosynthesis

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Publisher
Springer Journals
Copyright
Copyright © 2003 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1025683922953
Publisher site
See Article on Publisher Site

Abstract

The homogenate and chloroplast fractions isolated from the leaves of 10–14-day-old kidney-bean (Phaseolus vulgaris L.) seedlings were incubated with 14C-L-phenylalanine for 30 min in the light, and the incorporation of radioactivity into phenolic compounds was determined. Label incorporation into phenolic compounds of the homogenate and chloroplast fractions amounted to 15–17 and 4–5% of the introduced radioactivity, respectively. The chloroplasts were about an order of magnitude higher than the homogenate in the specific radioactivity of phenolic compounds. Chloroplasts contained four flavonol glycosides (kaempferol and quercetin aglycones), which were the major components of soluble phenolic compounds of leaves. It was concluded that kidney-bean leaf chloroplasts were capable of performing phenolic compound biosynthesis.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 11, 2004

References

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