This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Web of Science (44) Citing Articles via Google Scholar Google Scholar Articles by Rise, M. Articles by Goldschmidt, E. E. Search for Related Content PubMed PubMed Citation Articles by Rise, M. Articles by Goldschmidt, E. E. Agricola Articles by Rise, M. Articles by Goldschmidt, E. E.

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.

This article has been cited by other articles:

				A.-R. Abbasi, M. Hajirezaei, D. Hofius, U. Sonnewald, and L. M. Voll Specific Roles of {alpha}- and {gamma}-Tocopherol in Abiotic Stress Responses of Transgenic Tobacco Plant Physiology, April 1, 2007; 143(4): 1720 - 1738. [Abstract] [Full Text] [PDF]

				T. Ischebeck, A. M. Zbierzak, M. Kanwischer, and P. Dormann A Salvage Pathway for Phytol Metabolism in Arabidopsis J. Biol. Chem., February 3, 2006; 281(5): 2470 - 2477. [Abstract] [Full Text] [PDF]

				H. E. Valentin, K. Lincoln, F. Moshiri, P. K. Jensen, Q. Qi, T. V. Venkatesh, B. Karunanandaa, S. R. Baszis, S. R. Norris, B. Savidge, et al. The Arabidopsis vitamin E pathway gene5-1 Mutant Reveals a Critical Role for Phytol Kinase in Seed Tocopherol Biosynthesis PLANT CELL, January 1, 2006; 18(1): 212 - 224. [Abstract] [Full Text] [PDF]

				C. Diaz, S. Purdy, A. Christ, J.-F. Morot-Gaudry, A. Wingler, and C. Masclaux-Daubresse Characterization of Markers to Determine the Extent and Variability of Leaf Senescence in Arabidopsis. A Metabolic Profiling Approach Plant Physiology, June 1, 2005; 138(2): 898 - 908. [Abstract] [Full Text] [PDF]

				E. Collakova and D. DellaPenna The Role of Homogentisate Phytyltransferase and Other Tocopherol Pathway Enzymes in the Regulation of Tocopherol Synthesis during Abiotic Stress Plant Physiology, October 1, 2003; 133(2): 930 - 940. [Abstract] [Full Text] [PDF]

				E. Collakova and D. DellaPenna Homogentisate Phytyltransferase Activity Is Limiting for Tocopherol Biosynthesis in Arabidopsis Plant Physiology, February 1, 2003; 131(2): 632 - 642. [Abstract] [Full Text] [PDF]

				S. Porfirova, E. Bergmuller, S. Tropf, R. Lemke, and P. Dormann Isolation of an Arabidopsis mutant lacking vitamin E and identification of a cyclase essential for all tocopherol biosynthesis PNAS, September 17, 2002; 99(19): 12495 - 12500. [Abstract] [Full Text] [PDF]