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Metabolism and Enzymology

Accumulation of -Tocopherol in Senescing Organs as Related to Chlorophyll Degradation

Department of Horticulture, The Hebrew University of Jerusalem, Rehovot 76100, Israel, Department of Chemistry, Bar-Ilan University, Ramat Gan 52100, Israel

-Tocopherol (-T) has been identified, using gas chromatography-mass spectroscopy and ¹H- and ¹³C-nuclear magnetic resonance, in senescing leaves of Melia azedarach L. The content of -T increased concomitantly with the breakdown of chlorophyll in senescing Vinca and Melia leaves. An increase in -T was found also in detached Melia leaves, senescing in either light or darkness and in senescing, ethylene-treated orange leaves and fruit. The possibility that phytol, which is released from chlorophyll by chlorophyllase is utilized for the biosynthesis of -T is discussed. Senescing leaves of the low chlorophyllase plants, parsley and tobacco, did not contain -T in measureable amounts.

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