The effects of nitrogen fertilisation and elevated CO2 on the lipid biosynthesis and carbon isotopic discrimination in birch seedlings (Betula pendula) |
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Authors: | Huang Y Eglinton G Ineson P Bol R Harkness D D |
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Institution: | (1) Environmental and Analytical Chemistry Section, School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK;(2) Biogeochemistry Research Centre, c/o Department of Geology, University of Bristol, BS8 1RJ, UK;(3) Soil Ecology Section, Merlewood Research Station, Windermere Road, Grange-Over-sands, Cumbria, LA11 6JU, UK;(4) NERC Radiocarbon Laboratory, NEL Technology Park, East Kilbride, Glasgow, G75 0QU, UK |
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Abstract: | The effects of nitrogen (N) fertilisation and elevated CO2] on lipid biosynthesis and carbon isotope discrimination in birch (Betula pendula Roth.) transplants were evaluated using seedlings grown with and without N fertiliser, and under two concentrations of atmospheric
CO2 (ambient and ambient+250 μmol mol-1) in solar dome systems. N fertilisation decreased n-fatty acid chain length (18:0/16:0) and the ratios of α-linolenate (18:2)/linoleate (18:1), whereas elevated CO2] showed little effect on n-fatty acid chain length, but decreased the unsaturation (18:2+18:1)/18:0. Both N fertilisation and elevated CO2] increased the quantity of leaf wax n-alkanes, whilst reducing that of n-alkanols by 20–50%, but had no simple response in fatty acid concentrations. 13C enrichment by 1–2.5‰ under N fertilisation was observed, and can be attributed to both reduced leaf conductance and increased
photosynthetic consumption of CO2. Individual n-alkyl lipids of different chain length show consistent pattern of δ13C values within each homologue, but are in general 5–8‰ more depleted in 13C than the bulk tissues. Niether nitrogen fertilisation and elevated CO2 influenced the relationship between carbon isotope discrimination of the bulk tissue and the individual lipids.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Betula pendula Nitrogen fertilisation CO2 concentration Carbon isotopic fractionation Lipids |
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