Responses of Strawberry (Fragaria x ananassa) to Supplemental UV-B Radiation and Selenium Under Field Conditions

In greenhouse experiments, selenium (Se) has been shown to defend plants against detrimental effects of heavy UV-B radiation stress. The aim of this study was to investigate whether this positive effect can be found in open-field conditions with enhancement of UV-B radiation. In the experiment, cond...

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Bibliographic Details
Published in:Plant and soil 2006-04, Vol.282 (1-2), p.27-39
Main Authors: Heijari, J, Kivimäenpää, M, Hartikainen, H, Julkunen-Tiitto, R, Wulff, A
Format: Article
Language:English
Subjects:
chlorophyll
Cultivars
Epidermal cells
Flavonoids
Flowers & plants
Fluorescence
Fragaria ananassa
Growing season
Leaves
Mesophyll cells
Parenchyma
Photosynthesis
photosystem II
physiological response
plant biochemistry
plant ecology
plant growth
plant morphology
plant response
plant stress
Plants
secondary metabolites
Selenium
soil nutrients
stomata
strawberries
Tannins
ultrastructure
Ultraviolet radiation
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Summary:In greenhouse experiments, selenium (Se) has been shown to defend plants against detrimental effects of heavy UV-B radiation stress. The aim of this study was to investigate whether this positive effect can be found in open-field conditions with enhancement of UV-B radiation. In the experiment, conducted with strawberry (Fragaria×ananassa, cultivars "Jonsok" and "Polka") over two growing seasons, plants were exposed to UV-B radiation (including UV-A) and cultivated without Se or supplied with Se added at two levels (0.1 and 1.0 mg kg-1). The plants were monitored for growth, flavonoids, chlorophyll fluorescence, net photosynthesis as well as tissue and cell structure. Photosystem II was observed to be sensitive to UV-B stress under field conditions. In the leaves, a decrease in Fv/Fm was seen at the end of the growing season, implying a cumulative effect of UV-B stress. Several parameters, especially cell and tissue structures, were affected by UV-B and UV-A treatments, which proves the need for UV-A control in outdoor UV-B supplementation studies. Addition of Se did not ameliorate the harmful effects of UV-B but the lower Seincrement level increased leaf growth. The effects of UV-B and Se differed during the two experimental years, indicating the need to repeat experiments during several growing seasons.
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-005-5168-x