UV-B absorbing pigments in spores: biochemical responses to shade in a high-latitude birch forest and implications for sporopollenin-based proxies of past environmental change

被引：36

作者：

Fraser, Wesley T. ^{[1
,2
]}

Sephton, Mark A. ^{[3
]}

Watson, Jonathan S. ^{[4
]}

Self, Stephen ^{[2
]}

Lomax, Barry H. ^{[5
]}

James, David I. ^{[6
]}

Wellman, Charles H. ^{[7
]}

Callaghan, Terry V. ^{[7
,8
]}

Beerling, David J. ^{[7
]}

机构：

[1] Univ Edinburgh, Sch Geosci, Edinburgh EH9 3JN, Midlothian, Scotland

[2] Open Univ, Dept Earth & Environm Sci, Milton Keynes MK7 6AA, Bucks, England

[3] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW7 2AZ, England

[4] Open Univ, Planetary & Space Sci Res Inst, Milton Keynes MK7 6AA, Bucks, England

[5] Univ Nottingham, Sch Biosci, Div Agr & Environm Sci, Nottingham NG7 2RD, England

[6] Thermo Fisher Sci, Hemel Hempstead HP2 7GE, England

[7] Univ Sheffield, Dept Anim & Plant Sci, Sheffield S10 2TN, S Yorkshire, England

[8] Abisko Sci Res Stn, SE-98107 Abisko, Sweden

来源：

POLAR RESEARCH | 2011年 / 30卷

关键词：

FTIR; spores; ferulic acid; rho-coumaric acid; shade; sporopollenin; RADIATION; POLLEN;

D O I：

10.3402/polar.v30i0.8312

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

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.

引用

页数：6