%0 Journal Article
%A Matsubara, S.
%A Naumann, M.
%A Martin, J. M.
%A Nichol, C.
%A Rascher, U.
%A Morosinotto, T.
%A Bassi, R.
%A Osmond, B.
%T Slowly reversible de-epoxidation of lutein-epoxide in deep shade leaves of a tropical tree legume may 'lock-in' lutein-based photoprotection during acclimation to strong light
%J The journal of experimental botany
%V 56
%@ 0022-0957
%C Oxford
%I Univ. Press
%M PreJuSER-40448
%P 461 - 468
%D 2005
%Z Record converted from VDB: 12.11.2012
%X The kinetics of response to strong light have been examined in deeply shaded leaves of the tropical tree legume (Inga sp.) which have extraordinarily high levels of the alpha-xanthophyll lutein-epoxide that are co-located in pigment-protein complexes of the photosynthetic apparatus with the beta-xanthophyll violaxanthin. As in other species, rapidly reversible photoprotection (measured as non-photochemical chlorophyll fluorescence quenching) is initiated within the time frame of sun-flecks (minutes), before detectable conversion of violaxanthin to antheraxanthin or zeaxanthin. Photoprotection is stabilized within hours of exposure to strong light by simultaneously engaging the reversible violaxanthin cycle and a slowly reversible conversion of lutein-epoxide to lutein. It is proposed that this lutein 'locks in' a primary mechanism of photoprotection during photoacclimation in this species, converting efficient light-harvesting antennae of the shade plant into potential excitation dissipating centres. It is hypothesized that lutein occupies sites L2 and V1 in light-harvesting chlorophyll protein complexes of photosystem II, facilitating enhanced photoprotection through the superior singlet and/or triplet chlorophyll quenching capacity of lutein.
%K Acclimatization: physiology
%K Circadian Rhythm
%K Electron Transport
%K Fabaceae: metabolism
%K Fabaceae: physiology
%K Fabaceae: radiation effects
%K Light
%K Lutein: analogs & derivatives
%K Lutein: metabolism
%K Photosynthetic Reaction Center Complex Proteins: physiology
%K Pigments, Biological: metabolism
%K Plant Leaves: physiology
%K Trees: physiology
%K Tropical Climate
%K Photosynthetic Reaction Center Complex Proteins (NLM Chemicals)
%K Pigments, Biological (NLM Chemicals)
%K Lutein (NLM Chemicals)
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:15501906
%U <Go to ISI:>//WOS:000226610500015
%R 10.1093/jxb/eri012
%U https://juser.fz-juelich.de/record/40448