Abstract
Leaves of avocado (Persea americana) accumulate the α-xanthophyll lutein-epoxide (Lx) in excess of violaxanthin (V) in shaded habitats. On transfer to strong light both Lx and V are deepoxidised by violaxanthin de-epoxidase (VDE) to lutein (L) and to antheraxanthin (A) and zeaxanthin (Z) respectively, with about the same kinetics. However, whereas Z and A are rapidly epoxidised to form V by zeaxanthin epoxidase (ZE) when in shade or darkness, lutein is converted to Lx about 250 × more slowly, and hence Lx remains low in sun leaves. We investigated relationships between xanthophyll pool sizes and PSII efficiency (dark adapted Fv/Fm) in avocado leaves and discuss implications for the regulation of light harvesting efficiency arising from the differing epoxidation kinetics of these two co-located xanthophyll cycles
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© 2008 Springer Science + Business Media, B.V.
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Osmond, C.B., Förster, B., Pogson, B.J. (2008). Dynamics of the Truncated Lutein Epoxide Cycle in Avocado (Persea americana L.); Implications for Efficiency of Light Harvesting. In: Allen, J.F., Gantt, E., Golbeck, J.H., Osmond, B. (eds) Photosynthesis. Energy from the Sun. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6709-9_225
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DOI: https://doi.org/10.1007/978-1-4020-6709-9_225
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-6707-5
Online ISBN: 978-1-4020-6709-9
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