期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 168, 期 17, 页码 2021-2027出版社
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.jplph.2011.06.015
关键词
Biosynthesis; Kalanchoe daigremontiana; Phaseolus coccineus; Tocopherol; Tocomonoenol; Vitamin E
In the present study, we isolated novel tocochromanols from green leaves of Kalanchoe daigremontiana and primary leaves of etiolated seedlings of Phaseolus coccineus that were identified as beta-, gamma-, and delta-tocomonoenols with unsaturation at the terminal isoprene unit of the side chain. The content of gamma-tocomonoeno in leaves of etiolated bean increased gradually with the age of seedlings, reaching 50% of the gamma-tocopherol level in 40-day-old plants. The content of this compound in leaves was increased by short illumination of etiolated plants and by addition of homogentisic acid, a biosynthetic precursor of tocopherols. These data indicated that gamma-tocomonoenol is synthesized de novo from homogentisic acid and tetrahydro-geranylgeraniol diphosphate, a phytol precursor. Based on these results, a biosynthetic pathway of tocomonoenols is proposed. (C) 2011 Elsevier GmbH. All rights reserved.
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