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Titolo:
(Poly)phenolic compounds in pollen and spores of Antarctic plants as indicators of solar UV-B - A new proxy for the reconstruction of past solar UV-B?
Autore:
Rozema, J; Noordijk, AJ; Broekman, RA; van Beem, A; Meijkamp, BM; de Bakker, NVJ; van de Staaij, JWM; Stroetenga, M; Bohncke, SJP; Konert, M; Kars, S; Peat, H; Smith, RIL; Convey, P;
Indirizzi:
Free Univ Amsterdam, Dept Syst Ecol, NL-1081 HV Amsterdam, Netherlands Free Univ Amsterdam Amsterdam Netherlands NL-1081 HV terdam, Netherlands Dept Quaternary Geol & Geomorphol, NL-1081 HV Amsterdam, Netherlands Dept Quaternary Geol & Geomorphol Amsterdam Netherlands NL-1081 HV lands British Antarctic Survey, Nat Environm Res Council, Cambridge CB3 OET, England British Antarctic Survey Cambridge England CB3 OET idge CB3 OET, England
Titolo Testata:
PLANT ECOLOGY
fascicolo: 1-2, volume: 154, anno: 2001,
pagine: 9 -
SICI:
1385-0237(200106)154:1-2<9:(CIPAS>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ULTRAVIOLET-RADIATION; STRATOSPHERIC OZONE; VASCULAR PLANTS; TISSUE LOCALIZATION; TERRESTRIAL PLANTS; EARLY EVOLUTION; EARTHS SURFACE; BRASSICA-RAPA; GROWTH; SPOROPOLLENIN;
Keywords:
Antarctic; bio-indicator; Colobanthus quitensis; Deschampsia antarctica; historic UV-B radiation; pollen; polyphenolics; proxy; sporopollenin; stratospheric ozone depletion;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
112
Recensione:
Indirizzi per estratti:
Indirizzo: Rozema, J Free Univ Amsterdam, Dept Syst Ecol, De Boelelaan 1087, NL-1081 HV Amsterdam, Netherlands Free Univ Amsterdam De Boelelaan 1087 Amsterdam Netherlands NL-1081 HV
Citazione:
J. Rozema et al., "(Poly)phenolic compounds in pollen and spores of Antarctic plants as indicators of solar UV-B - A new proxy for the reconstruction of past solar UV-B?", PLANT ECOL, 154(1-2), 2001, pp. 9

Abstract

The morphology, size and characteristics of the pollen of the plant species Antarctic hairgrass (Deschampsia antarctica, Poaceae) and Antarctic pearlwort (Colobanthus quitensis, Caryophyllaceae) are described by scanning electron microscopy and light microscopy. Based on the number of pores the pollen of Colobanthus quitensis is classified as periporate or polypantorate, while that of Deschampsia antarctica is monoporate. Pollen of Vicia faba plants, exposed to enhanced UV-B (10.6 kJ m(-2) day(-)1 UV-B-BE) in a greenhouse, showed an increased content of UV-B absorbing compounds. There was also an increase of UV-B absorbing compounds in response to exposure to UV-A. By sequential chemical extraction three `compartments' of UV-B absorbance of pollen can be distinguished: a cytoplasmic fraction consisting of, e.g., flavonoids (acid-methanol extractable), a wall-bound fraction, consisting of, e.g., ferulic acid (NaOH extractable) and aromatic groups in the bioresistant polymer sporopollenin possibly consisting of,e.g., para-coumaric acid monomers (fraction remaining after acetolysis). The sporopollenin fraction in the pollen of Helleborus foetidus showed considerable UV-B absorbance (280-320 nm). There is evidence that enhanced solarUV-B induces increased UV-B absorbance (of sporopollenin) in pollen and spores of mosses, which may be preserved in the fossil record. As there are no instrumental records of solar UV-B in the Antarctic before 1970 and no instrumental records of stratospheric ozone over the Antarctic before 1957, the use of UV-B absorbing polyphenolics in pollen (and spores) as bio-indicator, or proxy of solar UV-B, may allow reconstruction of pre-ozone hole andsubrecent UV-B and stratospheric ozone levels. Pollen and spores from herbarium specimens and from frozen moss banks (about 5000-10 000 years old) inthe Antarctic may, therefore, represent a valuable archive of historical UV-B levels.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 07:17:19