Photosynthesis Research

, Volume 42, Issue 2, pp 89–109

Regulation and possible function of the violaxanthin cycle

  • Erhard Pfündel
  • Wolfgang Bilger
Review

DOI: 10.1007/BF02187121

Cite this article as:
Pfündel, E. & Bilger, W. Photosynth Res (1994) 42: 89. doi:10.1007/BF02187121

Abstract

This paper discusses biochemical and regulatory aspects of the violaxanthin cycle as well as its possible role in photoprotection. The violaxanthin cycle responds to environmental conditions in the short-term and long-term by adjusting rates of pigment conversions and pool sizes of cycle pigments, respectively. Experimental evidence indicating a relationship between zeaxanthin formation and non-photochemical energy dissipation is reviewed. Zeaxanthin-associated energy dissipation appears to be dependent on transthylakoid ΔpH. The involvement of light-harvesting complex II in this quenching process is indicated by several studies. The current hypotheses on the underlying mechanism of zeaxanthin-dependent quenching are alterations of membrane properties, including conformational changes of the light-harvesting complex II, and singlet-singlet energy transfer from chlorophyll to zeaxanthin

Key words

carotenoidchlorophyllfluorescencephotoinhibitionxanthophyll cyclezeaxanthin

Abbreviations

chl

chlorophyll

DBMIB

2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone

DCMU

3,3-(3′,4′-dichlorophenyl)-1,1-dimethylurea

DTT

dithiothreitol

Fo

minimum fluorescence yield with all PS II reaction centers open

LHC

light-harvesting complex

PS

photosystem

PQ

plastoquinone

qE-quenching

pN-quenching dependent on thylakoid lumen acidification

qN-quenching

non-photochemical quenching

UV-B

ultraviolet radiation in the range from 280 to 320 nm

Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Erhard Pfündel
    • 1
  • Wolfgang Bilger
    • 2
  1. 1.Institut für Pflanzengenetik und KulturpflanzenforschungGaterslebenGermany
  2. 2.Julius-von-Sachs-Institut für Biowissenschaften Lehrstuhl Botanik IIUniversität WürzburgWürzburgGermany