Abstract
The lutein-epoxide cycle (Lx cycle) is an auxiliary xanthophyll cycle known to operate only in some higher-plant species. It occurs in parallel with the common violaxanthin cycle (V cycle) and involves the same epoxidation and de-epoxidation reactions as in the V cycle. In this study, the occurrence of the Lx cycle was investigated in the two major families of mistletoe, the Loranthaceae and the Viscaceae. In an attempt to find the limiting factor(s) for the occurrence of the Lx cycle, pigment profiles of mistletoes with and without the Lx cycle were compared. The availability of lutein as a substrate for the zeaxanthin epoxidase appeared not to be critical. This was supported by the absence of the Lx cycle in the transgenic Arabidopsis plant lutOE, in which synthesis of lutein was increased at the expense of V by overexpression of ε-cyclase, a key enzyme for lutein synthesis. Furthermore, analysis of pigment distribution within the mistletoe thylakoids excluded the possibility of different localizations for the Lx- and V-cycle pigments. From these findings, together with previous reports on the substrate specificity of the two enzymes in the V cycle, we propose that mutation to zeaxanthin epoxidase could have resulted in altered regulation and/or substrate specificity of the enzyme that gave rise to the parallel operation of two xanthophyll cycles in some plants. The distribution pattern of Lx in the mistletoe phylogeny inferred from 18S rRNA gene sequences also suggested that the occurrence of the Lx cycle is determined genetically. Possible molecular evolutionary processes that may have led to the operation of the Lx cycle in some mistletoes are discussed.
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Abbreviations
- A:
-
antheraxanthin
- α- and β-Car:
-
α- and β-carotene
- Chl:
-
chlorophyll
- α-DM:
-
dodecyl-α-d-maltoside
- DPS:
-
de-epoxidation state of the violaxanthin cycle (= [A+Z]/[V+A+Z])
- Lut:
-
lutein
- Lx:
-
lutein epoxide
- Σ Caro:
-
total carotenoid concentration
- V:
-
violaxanthin
- VAZ:
-
pool size of the violaxanthin cycle (= V+A+Z)
- VDE:
-
violaxanthin de-epoxidase
- Z:
-
zeaxanthin
- ZE:
-
zeaxanthin epoxidase
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Acknowledgements
S.M. is the recipient of an ANU PhD Graduate School Scholarship (Endowment for Excellence) and an Overseas Postgraduate Research Scholarship. Part of this study was supported by a Forschungspreis from the Alexander von Humboldt Stiftung to C.B.O. and PRONEX-CNPq Brazil to A.C.F.. We thank Dr. Georg Weiller (Canberra, Australia) for invaluable advice on the phylogenetic analyses and Dr. Marilyn C. Ball for helpful comments on the manuscript. Kind assistance for HPLC experiments by Prof. Carlos A. Schwartz and Dr. Osmindo R. Pires Jr. (Brasilía, Brazil) and the identification of species in Rio de Janeiro by Carlos H. R. de Paula (Rio de Janeiro, Brazil) are greatly acknowledged. Plant materials were collected with the help of Claudenir S. Caires and Vandelio C. Mendes (Brasília, Brazil), Dr. Cornelia Büchen-Osmond (Oracle, USA), Dr. Stephan Schneckenburger (Darmstadt, Germany), and Dr. John C.G. Banks and Dr. Torsten Jülich (Canberra, Australia), to whom we would like to extend the warmest thanks.
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Matsubara, S., Morosinotto, T., Bassi, R. et al. Occurrence of the lutein-epoxide cycle in mistletoes of the Loranthaceae and Viscaceae. Planta 217, 868–879 (2003). https://doi.org/10.1007/s00425-003-1059-7
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DOI: https://doi.org/10.1007/s00425-003-1059-7