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The Influence of Benzyladenine on Phospholipid Metabolism in Seeds of Cucumis sativus L.

H. V. DAVIES and J. M. CHAPMAN
Annals of Botany
Vol. 53, No. 1 (January 1984), pp. 65-72
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42756861
Page Count: 8
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The Influence of Benzyladenine on Phospholipid Metabolism in Seeds of Cucumis sativus L.
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Abstract

The application of cytokinins to cotyledons of dark-grown seedlings can induce many of the changes which are observed to occur in white light. Changes occurring in light depend upon an alteration in the synthesis of membrane following increases in fatty acid desaturase activity. The possibility that cytokinins could replace the effect of light on polyunsaturated fatty acid formation was investigated by adding benzyladenine (BA) to dark-grown cucumber cotyledons. Benzyladenine treatment caused increases in the linolenic acid content of phosphatidylcholine (PC) and phosphatidylethanolamine and to a lesser extent in phosphatidylglycerol and di-and monogalactosyldiglycerides. The use of radio-labelled acetate, oleate and linoleate showed that these increases were caused partly by an increase in the rate of utilization of newly synthesized palmitic acid for elongation and desaturation purposes and partly by an increase in the desaturation rate of existing oleic and linoleic acids. Further experiments using polyethylene glycol to eliminate BA-induced cotyledon expansion showed that all of the changes observed in fatty acid metabolism were in fact a consequence of such expansion even though BA was still inducing the characteristic disaggregation of prolamellar bodies.

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