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Protocols in ecological and environmental plant physiology


Article << Previous     |     Next >>   Contents Vol 37(9)

Operation and regulation of the lutein epoxide cycle in seedlings of Ocotea foetens

Raquel Esteban A D, Shizue Matsubara B, María Soledad Jiménez C, Domingo Morales C, Patricia Brito C, Roberto Lorenzo C, Beatriz Fernández-Marín A, José María Becerril A, José Ignacio García-Plazaola A

A Departamento de Biología Vegetal y Ecología, Universidad del País Vasco EHU, Apdo. 644, E-48080 Bilbao, Spain.
B Institut für Phytosphäre (ICG-3), Forschungszentrum Jülich, 52425 Jülich, Germany.
C Departamento de Biología Vegetal, Universidad de La Laguna, 38207 La Laguna, Tenerife, Spain.
D Corresponding author. Email: raquel.esteban@ehu.es
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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.

Keywords: de-epoxidation, epoxidation, laurel forest, xanthophyll cycles, violaxanthin.

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