Journal
SCIENTIA HORTICULTURAE
Volume 127, Issue 4, Pages 482-487Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scienta.2010.11.010
Keywords
Abscisic acid; Oxidative stress; Photoprotection; Pigments; Xanthophylls cycle
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The effect of girdling on abscisic acid, carotenoids content, xanthophylls cycle and non-photoquemical quenching was studied in leaves from different shoot types of containerized two-year-old 'Loretina' mandarin during spring flush period. Girdling increased abscisic acid in young leaves and decreased it in mature leaves. These changes were accompanied by a significant increase in leaf carotenoids, carotenoids:chlorophylls ratio, xanthophylls and xanthophylls cycle pool size and its de-epoxidation state in vegetative and multiflowered young leafy shoots. However, changes in de-epoxidation state did not correlate with the energy-dependent non-photochemical quenching. The role of carotenoids and abscisic acid as photoprotecting agents during the oxidative stress caused by girdling is discussed. In conclusion, this study provides evidence linking carotenoids-based photoprotecting mechanisms in the response to the stress induced by girdling in Citrus trees. (C) 2010 Elsevier B.V. All rights reserved.
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