TY  - JOUR
AU  - Matsubara, S.
AU  - Naumann, M.
AU  - Martin, J. M.
AU  - Nichol, C.
AU  - Rascher, U.
AU  - Morosinotto, T.
AU  - Bassi, R.
AU  - Osmond, B.
TI  - 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
JO  - The journal of experimental botany
VL  - 56
SN  - 0022-0957
CY  - Oxford
PB  - Univ. Press
M1  - PreJuSER-40448
SP  - 461 - 468
PY  - 2005
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - Acclimatization: physiology
KW  - Circadian Rhythm
KW  - Electron Transport
KW  - Fabaceae: metabolism
KW  - Fabaceae: physiology
KW  - Fabaceae: radiation effects
KW  - Light
KW  - Lutein: analogs & derivatives
KW  - Lutein: metabolism
KW  - Photosynthetic Reaction Center Complex Proteins: physiology
KW  - Pigments, Biological: metabolism
KW  - Plant Leaves: physiology
KW  - Trees: physiology
KW  - Tropical Climate
KW  - Photosynthetic Reaction Center Complex Proteins (NLM Chemicals)
KW  - Pigments, Biological (NLM Chemicals)
KW  - Lutein (NLM Chemicals)
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
C6  - pmid:15501906
UR  - <Go to ISI:>//WOS:000226610500015
DO  - DOI:10.1093/jxb/eri012
UR  - https://juser.fz-juelich.de/record/40448
ER  -