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Contrasting strategies for UV-B screening in sub-Arctic dwarf shrubs
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2003 (Engelska)Ingår i: Plant, Cell and Environment, ISSN 0140-7791, E-ISSN 1365-3040, Vol. 26, nr 6, s. 957-964Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The content and distribution of UV-absorbing phenolic compounds was investigated in leaves of three species of Vaccinium co-existing at a site in north Sweden. Vaccinium myrtillus L., Vaccinium vitis-idaea L., and Vaccinium uliginosum L. exhibit markedly different strategies, in terms of localization and content of leaf phenolics and in their responses to UV-B enhancement. Plants were exposed to either ambient radiation or to enhancement of UV-B corresponding to 15% (clear sky) depletion of stratospheric ozone for approximately 10 years prior to commencement of this study. Vaccinium myrtillus contained the highest concentration of methanol-extractable UV-B-absorbing compounds, which was elevated in plants exposed to enhanced UV-B. Fluorescence and confocal laser scanning microscopy showed that these compounds were distributed throughout the leaf, and were particularly concentrated in chlorophyll-containing cells. In V. vitis-idaea , most phenolic compounds were cell wall-bound and concentrated in the walls of the epidermis; this pool increased in response to UV-B enhancement. It is suggested that these two plants represent extreme forms of two divergent strategies for UV-B screening, the different responses possibly being related to leaf longevity in the two species. The response of V. uliginosum was intermediate between the other two, with high concentrations of cell wall-bound phenolics in the epidermis but with this pool decreasing, and the methanol-soluble pool tending to increase, after exposure to enhanced UV-B. One explanation for this response is that this plant is deciduous, like V. myrtillus , but has leaves that are structurally similar to those of V. vitis-idaea .

Ort, förlag, år, upplaga, sidor
BLACKWELL PUBLISHING LTD , 2003. Vol. 26, nr 6, s. 957-964
Nyckelord [en]
Vaccinium myrtillus; Vaccinium uliginosum; Vaccinium vitis-idaea; enhanced UV-B; fluorescence microscopy; phenolics
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Naturvetenskap
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URN: urn:nbn:se:polar:diva-3605DOI: 10.1046/j.1365-3040.2003.01029.xOAI: oai:DiVA.org:polar-3605DiVA, id: diva2:1101170
Tillgänglig från: 2017-05-29 Skapad: 2017-05-29 Senast uppdaterad: 2017-05-29

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