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Alternate energy dissipation? Phenolic metabolites and the xanthophyll cycle
journal contribution
posted on 2023-05-16, 20:12 authored by Dugald CloseDugald Close, Christopher BeadleChristopher BeadleThe dynamics of phenolic galloylglucoses (di-, tri-, tetra-, and penta-galloylglucose), flavonoids (quercitin and quercitin glycosides) and sideroxylonal were compared with that of xanthophyll cycle-dependent energy dissipation during rapid induction of chilling-dependent photo-inhibition. Pre-dawn xanthophyll cycle engagement of seedlings of Eucalyptus nitens transferred from mild nursery conditions to a low temperature controlled environment increased logarithmically during eight days of treatment. Photochemical efficiency and flavonoids decreased after four days of treatment and non-photochemical quenching after two days of treatment. Galloylglucoses and sideroxylonal decreased linearly during treatment. These results demonstrate that rapid changes in foliar phenolic levels are associated with abrupt changes in the plant environment. It is argued that under these growth-chamber conditions, the xanthophyll cycle facilitated dissipation of excess light energy, lessening the requirement for the dissipation of energy or antioxidant activity through phenolic metabolites.
History
Publication title
Journal of Plant PhysiologyVolume
160Issue
4Pagination
431-434ISSN
0176-1617Department/School
School of Natural SciencesPublisher
Urban und Fischer VerlagPlace of publication
Germany, Portugal, SpainRepository Status
- Restricted