Document Detail

Effects of long-term, elevated ultraviolet-B radiation on phytochemicals in the bark of silver birch (Betula pendula).
MedLine Citation:
PMID:  12464579     Owner:  NLM     Status:  MEDLINE    
Long-term outdoor experiments were conducted to investigate the effects of elevated ultraviolet-B (UV-B, 280-320 nm) radiation on secondary metabolites (phenolics and terpenoids) and the main soluble sugars (sucrose, raffinose and glucose) in the bark of silver birch (Betula pendula Roth) saplings. Saplings were exposed to a constant 50% increase in erythemal UV irradiance (UV-B(CIE); based on the CIE (International Commission on Illumination) erythemal action spectrum) and a small increase in UV-A radiation (320-400 nm) for three growing seasons in an irradiation field in central Finland. Two control groups were used: saplings exposed to ambient radiation and saplings exposed to slightly increased UV-A radiation. Concentrations of sucrose, raffinose and glucose in bark were higher in UV-treated saplings than in saplings grown in ambient radiation, indicating that stem carbohydrate metabolism was changed by long-term elevated UV radiation. Saplings in the elevated UV-A + UV-B radiation treatment and the UV-A radiation control treatment had significantly increased concentrations of certain UV-absorbing phenolics, such as salidroside, 3,4'-dihydroxypropiophenone-3-glucoside, (+)-catechin and (-)-epicatechin compared with saplings in ambient radiation. In contrast, the radiation treatments had no effect on the non-UV-B-absorbing terpenoids, papyriferic acid and deacetylpapyriferic acid. We conclude that plant parts, in addition to leaves, accumulate specific phenolic UV-filters in response to UV radiation exposure.
Riitta Tegelberg; Pedro J Aphalo; Riitta Julkunen-Tiitto
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Tree physiology     Volume:  22     ISSN:  0829-318X     ISO Abbreviation:  Tree Physiol.     Publication Date:  2002 Dec 
Date Detail:
Created Date:  2002-12-04     Completed Date:  2003-05-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100955338     Medline TA:  Tree Physiol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  1257-63     Citation Subset:  IM    
Department of Biology, Natural Product Research Laboratories, University of Joensuu, PO Box 111, 80101 Joensuu, Finland.
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MeSH Terms
Betula / chemistry,  physiology*
Catechin / analysis
Glucose / analysis
Glucosides / analysis
Phenols / analysis
Plant Bark / chemistry*,  physiology
Raffinose / analysis
Sucrose / analysis
Terpenes / analysis
Trees / chemistry,  physiology*
Ultraviolet Rays*
Reg. No./Substance:
0/Glucosides; 0/Phenols; 0/Terpenes; 10338-51-9/rhodioloside; 154-23-4/Catechin; 50-99-7/Glucose; 512-69-6/Raffinose; 57-50-1/Sucrose

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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