TY  - JOUR
AU  - Esteban, R.
AU  - Matsubara, S.
AU  - Jiménez, M.S.
AU  - Morales, D.
AU  - Brito, P.
AU  - Lorenzo, R.
AU  - Fernández-Martín, B.
AU  - Becerril, J.M.
AU  - Carcía-Plazaola, J.I.
TI  - Operation and regulation of the lutein epoxide cycle in seedlings of Ocotea foetens
JO  - Functional plant biology
VL  - 37
SN  - 1445-4408
CY  - Collingwood, Victoria
PB  - CSIRO Publ.
M1  - PreJuSER-11131
SP  - 859 - 869
PY  - 2010
N1  - We acknowledge B. Olascoaga (Basque Country University) for help during sampling and analyses, J. M. Olano for statistical advice, and the anonymous referees for their valuable suggestions regarding the manuscript. R. E. and B. F. M. received a fellowship from the Basque Government. R. E. received a grant from the Basque Government to make a visit to the ICG-3 (EC-2008-1-6). This research was supported by research BFU 2007-62637 from the Ministry of Education and Science of Spain, and research project UPV/EHU-GVIT-299-07.
AB  - Two xanthophyll cycles are present in higher plants: the ubiquitous violaxanthin (V) cycle and the taxonomically restricted lutein epoxide (Lx) cycle. Conversions of V to zeaxanthin (Z) in the first and Lx to lutein (L) in the second happen in parallel under illumination. Unlike the V cycle, in which full epoxidation is completed overnight, in the Lx cycle, this reaction has been described as irreversible on a daily basis in most species (the 'truncated' Lx cycle). However, there are some species that display complete restoration of Lx overnight ('true' Lx cycle). So far, little is known about the physiological meaning of these two versions of the Lx cycle. Therefore, in the present work, the 'true' Lx cycle operation was studied in seedlings of Ocotea foetens (Aiton) Benth. under controlled and field conditions. Complete overnight recovery of the Lx pool in the presence of norfluorazon suggested that the inter-conversions between Lx and L represent a true cycle in this species. Furthermore, Lx responded dynamically to environmental conditions during long-term acclimation. Our data demonstrate the operation of a 'true' Lx cycle and, for the first time, its potential involvement in the regulation of non-photochemical quenching in situ. We propose dual regulation of Lx cycle in O. foetens, in which the extent of Lx restoration depends on the intensity and duration of illumination.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000281148000007
DO  - DOI:10.1071/FP10014
UR  - https://juser.fz-juelich.de/record/11131
ER  -