Abstract
Several deciduous woody plant species produce anthocyanins during leaf development in spring and again during leaf senescence in autumn. The leaves of Betula pendula Roth (silver birch) commonly exhibit transient reddening in juvenile leaves under northern growing conditions, with the intensity of the red colour varying among individual trees. The objective of our study was to test the hypothesis that the accumulation of foliar anthocyanins during spring in leaves of B. pendula is an ecotypic response. Chlorophyll fluorescence ratio (Fv/Fm), leaf reflectance and anthocyanin concentrations were measured, in relation to phenology in spring, summer and autumn from birches used for landscaping with either red or green-emergent leaves. The results suggest that (1) the trees with green- or red-emergent juvenile leaves represent different populations, and (2) that the red-emergent leaves senesced earlier, indicating that (3) trees with red-emerging leaves belong to a more northern ecotype than the trees with green-emerging leaves. The role of anthocyanin synthesis in a northern radiation environment is discussed.
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Acknowledgments
Support for this study was provided by the Botanical Gardens University of Oulu and the Thule Institute of the University of Oulu. Mr. Niilo Rankka from the University of Oulu, Biology Department is acknowledged for skilful technical assistance. Mr. Aaron Berghdal is thanked for the language editing, and Mrs Sally Ulich for proofreading. We also thank an anonymous referee for valuable comments.
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Communicated by O. Junttila.
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Taulavuori, K., Pihlajaniemi, H., Huttunen, S. et al. Reddish spring colouring of deciduous leaves: a sign of ecotype?. Trees 25, 231–236 (2011). https://doi.org/10.1007/s00468-010-0500-3
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DOI: https://doi.org/10.1007/s00468-010-0500-3