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Plant and Cell Physiology Advance Access published online on June 27, 2009
Plant and Cell Physiology, 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 e-mail: journals.permissions@oxfordjournals.org

A novel carotenoid derivative, lutein 3-acetate, accumulates in senescent leaves of rice

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

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

*Corresponding author: Dr. Makoto Kusaba, Graduate School of Science, Hiroshima University Kagamiyama 1-4-3, Higashi-hiroshima, Hiroshima 739-8526, Japan, Tel.: +81 82 424 7490, Fax: +81 82 424 0738, E-mail: akusaba{at}hiroshima-u.ac.jp


  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. The analyses of mutants involved in 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

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