Abstract
Blue spruce [Picea pungens Engelmann.] seedlings were reared from seed for 8 weeks under one of seven UV-B doses ranging from 0.0 to 9.2 kJ m −2 d−1. Emerging primary needles were chopped and incubated 48 h (22°C; 750 μmol m−2 s−1 PAR) with [1−14C] CH3COONa. Radioactivity incorporated into epicuticular waxes was measured using radio thin-layer chromatography. Biosynthesis of nonacosan-10-ol, the dominant constituent, was affected by the UV-B dose. The results suggest that, if no other factors are limiting, the optimum UV-B dose for wax biosynthesis in emerging primary needles of blue spruce is 6−7 kJ m−2 d−1. This dose is below that routinely measured in some northern temperate forests and well within the range of predicted values under stratospheric ozone depletion scenarios. UV-B dose levels above this threshold may cause changes to the wax composition that may predispose the tree to damage from other environmental stresses.
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Gordon, D.C., Percy, K.E. (1999). Effect of UV-B Dose on Biosytnthesis of Epicuticular Waxes in Blue Spruce (Picea pungens Engelmann.) Primary Needles: Preliminary Investigation. In: Sheppard, L.J., Cape, J.N. (eds) Forest Growth Responses to the Pollution Climate of the 21st Century. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1578-2_40
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DOI: https://doi.org/10.1007/978-94-017-1578-2_40
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