Fraser, Wesley T.; Sephton, Mark A.; Watson, Jonathan S.; Self, Stephen; Lomax, Barry H.; James, David I.; Wellman, Charles H.; Callaghan, Terry V. and Beerling, David J.
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|DOI (Digital Object Identifier) Link:||http://doi.org/10.3402/polar.v30i0.8312|
|Google Scholar:||Look up in Google Scholar|
Current attempts to develop a proxy for Earth’s surface ultraviolet-B (UV-B) flux focus on the organic chemistry of pollen and spores because their constituent biopolymer, sporopollenin, contains UV-B absorbing pigments whose relative abundance may respond to the ambient UV-B flux. Fourier transform infrared (FTIR) microspectroscopy provides a useful tool for rapidly determining the pigment content of spores. In this paper, we use FTIR to detect a chemical response of spore wall UV-B absorbing pigments that correspond with levels of shade beneath the canopy of a high-latitude Swedish birch forest. A 27% reduction in UV-B flux beneath the canopy leads to a significant (p<0.05) 7.3% reduction in concentration of UV-B absorbing compounds in sporopollenin. The field data from this natural flux gradient in UV-B further support our earlier work on sporopollenin-based proxies derived from sedimentary records and herbaria collections.
|Item Type:||Journal Article|
|Copyright Holders:||2011 W.T. Fraser et al.|
|Project Funding Details:||
|Keywords:||FTIR; spores; ferulic acid; p-coumaric acid; shade; sporopollenin|
|Academic Unit/Department:||Science > Environment, Earth and Ecosystems
Science > Physical Sciences
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Jonathan Watson|
|Date Deposited:||25 Aug 2011 14:42|
|Last Modified:||23 Feb 2016 21:22|
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