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000011131 0247_ $$2DOI$$a10.1071/FP10014
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000011131 084__ $$2WoS$$aPlant Sciences
000011131 1001_ $$0P:(DE-HGF)0$$aEsteban, R.$$b0
000011131 245__ $$aOperation and regulation of the lutein epoxide cycle in seedlings of Ocotea foetens
000011131 260__ $$aCollingwood, Victoria$$bCSIRO Publ.$$c2010
000011131 300__ $$a859 - 869
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000011131 440_0 $$09141$$aFunctional Plant Biology$$v37$$x1445-4408$$y9
000011131 500__ $$aWe 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.
000011131 520__ $$aTwo xanthophyll cycles are present in higher plants: the ubiquitous violaxanthin (V) cycle and the taxonomically restricted lutein epoxide (Lx) cycle. Conversions of V to zeaxanthin (Z) in the first and Lx to lutein (L) in the second happen in parallel under illumination. Unlike the V cycle, in which full epoxidation is completed overnight, in the Lx cycle, this reaction has been described as irreversible on a daily basis in most species (the 'truncated' Lx cycle). However, there are some species that display complete restoration of Lx overnight ('true' Lx cycle). So far, little is known about the physiological meaning of these two versions of the Lx cycle. Therefore, in the present work, the 'true' Lx cycle operation was studied in seedlings of Ocotea foetens (Aiton) Benth. under controlled and field conditions. Complete overnight recovery of the Lx pool in the presence of norfluorazon suggested that the inter-conversions between Lx and L represent a true cycle in this species. Furthermore, Lx responded dynamically to environmental conditions during long-term acclimation. Our data demonstrate the operation of a 'true' Lx cycle and, for the first time, its potential involvement in the regulation of non-photochemical quenching in situ. We propose dual regulation of Lx cycle in O. foetens, in which the extent of Lx restoration depends on the intensity and duration of illumination.
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000011131 65320 $$2Author$$ade-epoxidation
000011131 65320 $$2Author$$aepoxidation
000011131 65320 $$2Author$$alaurel forest
000011131 65320 $$2Author$$axanthophyll cycles
000011131 65320 $$2Author$$aviolaxanthin
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000011131 7001_ $$0P:(DE-Juel1)129358$$aMatsubara, S.$$b1$$uFZJ
000011131 7001_ $$0P:(DE-HGF)0$$aJiménez, M.S.$$b2
000011131 7001_ $$0P:(DE-HGF)0$$aMorales, D.$$b3
000011131 7001_ $$0P:(DE-HGF)0$$aBrito, P.$$b4
000011131 7001_ $$0P:(DE-HGF)0$$aLorenzo, R.$$b5
000011131 7001_ $$0P:(DE-HGF)0$$aFernández-Martín, B.$$b6
000011131 7001_ $$0P:(DE-HGF)0$$aBecerril, J.M.$$b7
000011131 7001_ $$0P:(DE-HGF)0$$aCarcía-Plazaola, J.I.$$b8
000011131 773__ $$0PERI:(DE-600)1496158-1$$a10.1071/FP10014$$gVol. 37, p. 859 - 869$$p859 - 869$$q37<859 - 869$$tFunctional plant biology$$v37$$x1445-4408$$y2010
000011131 8567_ $$uhttp://dx.doi.org/10.1071/FP10014
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