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Journal of Experimental Botany, Vol 49, 1447-1450, Copyright © 1998 by Oxford University Press

ARTICLES

Short communication. Do anthocyanins play a role in UV protection of the red juvenile leaves of Syzygium?

G Woodall and G Stewart
Department of Botany, The University of Queensland, Brisbane, 4072 Queensland, Australia; Corresponding author

The biological function of juvenile leaves pigmented with anthocyanin is poorly understood. The role anthocyanins play in UV protection was assessed in juvenile leaves of two Syzygium species (S. luehmannii and S. wilsonii) which contain high anthocyanin concentrations. HPLC was used to separate UV-absorbing anthocyanins from other soluble UV-absorbing phenolic compounds. The isolated anthocyanins (predominantly malvidin-3,5-diglucoside) contributed little to the total absorbance of UV-A and UV-8 radiation. This was because the non-acylated anthocyanins only effectively absorbed shortwave UV-B radiation and the strong absorbance by other compounds. These results suggest that the UV protection hypothesis is not valid for anthocyanins in juvenile Syzygium leaves.Keywords: Anthocyanin, UV protection
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