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Phenolic acclimation to ultraviolet-A irradiation in Eucalyptus nitens seedlings raised across a nutrient environment gradient


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Close, DC, McArthur, C, Hagerman, AE, Davies, NW and Beadle, CL 2007 , 'Phenolic acclimation to ultraviolet-A irradiation in Eucalyptus nitens seedlings raised across a nutrient environment gradient' , Photosynthetica, vol. 45, no. 1 , pp. 36-42 .

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We investigated the effects of long-term acclimation of Eucalyptus nitens seedlings to ultraviolet-A (UV-A) irradiation
(320–400 nm) on phenolic compounds (gallotannins, stilbenes, and flavonols), photochemical efficiency, and chlorophyll
and carotenoid contents. Seedlings were raised under four nutrient regimes, ranging from low to high application
rates, in an environment that included or excluded UV-A irradiance. Our aims were: to classify phenolic compounds that
absorb in the UV-A and their relative contribution to total UV-A absorption; to identify how phenolic compounds
respond to UV-A exposure and exclusion, and to determine how plant nutrient status affects acclimation of photo- and
pigment-chemistry to UV-A exposure and exclusion. Gallotannins contributed to only a minor fraction of total
absorption within the lower range (320–360 nm) of the UV-A spectrum. Stilbene and flavonol compounds dominated
absorption within the 320–360 and 360–400 nm ranges, respectively. Contents of gallotannin were generally high in
UV-A-exposed seedlings. Although there was a significant effect of UV-A on contents of stilbenes, a general response
(across nutrient treatment comparisons) was not evident. Contents of flavonols were not affected by UV-A exposure.
Contents of gallotannin, stilbene, and flavonols decreased from low to high nutrient-application treatments. There were
no effects of UV-A on photochemical efficiency or pigment-chemistry.

Item Type: Article
Authors/Creators:Close, DC and McArthur, C and Hagerman, AE and Davies, NW and Beadle, CL
Keywords: carotenoids; chlorophyll; flavonol; fluorescence induction; gallotanins; nitrogen; stilbene; xanthophyll cycle.
Journal or Publication Title: Photosynthetica
Publisher: Akademie Ved Ceske Republiky
ISSN: 0300-3604
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