Cellular and Molecular Life Sciences CMLS

, Volume 56, Issue 3, pp 330–347

Chlorophyll breakdown in higher plants and algae

  • S. Hörtensteiner

DOI: 10.1007/s000180050434

Cite this article as:
Hörtensteiner, S. CMLS, Cell. Mol. Life Sci. (1999) 56: 330. doi:10.1007/s000180050434

Abstract.

Leaf senescence is accompanied by the metabolism of chlorophyll (Chl) to nonfluorescent catabolites (NCCs). The pathway of Chl degradation comprises several reactions and includes the occurrence of intermediary catabolites. After removal of phytol and the central Mg atom from Chl by chlorophyllase and Mg dechelatase, respectively, the porphyrin macrocycle of pheophorbide (Pheide) a is cleaved. This two-step reaction is catalyzed by Pheide a oxygenase and RCC reductase and yields a primary fluorescent catabolite (pFCC). After hydroxylation and additional species-specific modifications, FCCs are tautomerized nonenzymically to NCCs inside the vacuole. Different subcellular compartments participate in Chl catabolism and, thus, transport processes across membranes are required. This review focuses on the catabolites and the individual reactions of Chl breakdown in higher plants. In addition, the pathway is compared to Chl conversion to red catabolites in an alga, Chlorella protothecoides. Finally, the significance and regulation of Chl degradation are discussed.

Key Words. Breakdown; catabolites; catabolic pathway; chlorophyll; detoxification; pigment; senescence; vacuole. 

Copyright information

© Birkhäuser Verlag Basel, 1999

Authors and Affiliations

  • S. Hörtensteiner
    • 1
  1. 1.Institute of Plant Biology, University of Zurich, Zollikerstrasse 107, CH-8008 Zurich (Switzerland), Fax +41 1 634 82 04, e-mail: shorten@botinst.unizh.chCH

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