Ref ID: 9988
Ref Type: Journal
Authors: Close, D. C. and Beadle, C. L.
Pub Date: 2002
Journal Name: Journal of Plant Physiology
Volume: 160
Issue: 4
Start Page: 431
End Page: 464
ISBN/ISSN:
Keywords: cycle/dissipation/energy/Eucalyptus nitens/metabolite/phenolic metabolites/photodamage/photoinhibition/Tasmania/xanthophyll/xanthophyll cycle/dynamics/induction/seedlings/seedling/Eucalyptus/nursery/temperature/environment/efficiency/change/plant/light/antioxidant/antioxidant activity
Abstract: The 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.
Notes: Entered by Maria Cherry (17/7/2002)
Reprint: Not in File
Program: SPF Sustainable Management
Project: B3
Deliverable: B3-5.1
Confidentiality: Public
Availability: Authors;
Report: Annual Report 2002/3
Type: Article
Address: Dugald.Close@ffp.csiro.au