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Plant and Cell Physiology Advance Access originally published online on June 27, 2009
Plant and Cell Physiology 2009 50(8):1573-1577; doi:10.1093/pcp/pcp096
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

A Novel Carotenoid Derivative, Lutein 3-Acetate, Accumulates in Senescent Leaves of Rice

Makoto Kusaba1,*, Takashi Maoka2, Ryouhei Morita3 and Shinichi Takaichi4

1Graduate School of Science, Hiroshima University, Higashi-hirosima, 739-8526 Japan
2Research Institute for Production Development, Kyoto, 606-0805 Japan
3Institute of Radiation Breeding, National Institute of Agrobiological Sciences, Hitachi-ohmiya, 219-2293 Japan
4Department of Biology, Nippon Medical School, Kawasaki, 211-0063 Japan

*Corresponding author: E-mail, akusaba{at}hiroshima-u.ac.jp; Fax, +81 82 424 0738.


  Abstract

The biosynthetic pathway of lutein, the most abundant carotenoid in leaves, has been extensively studied, while its degradation pathway during senescence is poorly understood. We found that a novel carotenoid derivative, lutein 3-acetate, accumulates in senescent leaves of rice (Oryza sativa L.). The change in contents of lutein and lutein 3-acetate suggests that lutein is converted to lutein 3-acetate during senescence. Analysis of mutants involved in light-harvesting complex II (LHCII) accumulation and degradation suggests that the converting activity is induced during senescence and that only free lutein, not lutein bound to LHCII, is converted into lutein 3-acetate.

Keywords: carotenoid - leaf senescence - LHCII - lutein 3-acetate - rice

Abbreviations: CCD, carotenoid cleavage dioxygenase; DAD, days after dark incubation; LHCP, light-harvesting chlorophyll a/b binding protein complex; LHCII, light-harvesting complex II; TLC, thin-layer chromatography.

(Received May 28, 2009; Accepted June 25, 2009)
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