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000015910 084__ $$2WoS$$aHorticulture
000015910 1001_ $$0P:(DE-Juel1)VDB74001$$aBehn, H.$$b0$$uFZJ
000015910 245__ $$aUV-B Transmittance of Greenhouse Covering Materials Affects Growth and Flavonoid Content of Lettuce seedlings
000015910 260__ $$c2010
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000015910 440_0 $$024341$$aEuropean Journal of Horticultural Science$$v75$$y6
000015910 500__ $$aThe authors thank technical staff members of the Versuchsgut Marhof for plant cultivation, C. Wieland for taking images and harvesting of lettuce plants. Transmission data were kindly provided by CENTROSOLAR GLAS GmbH & Co. KG, Furth, Germany. The work was funded by grants of the Bundesministerium fur Bildung und Forschung (project 0330724B, 0330724C). Susanne Tittmann acknowledges the support of her PhD thesis at the Heinrich-Heine-University Dusseldorf.
000015910 520__ $$aIn Europe, lettuce (Lactuca sativa L., Asteraceae) is commonly raised in greenhouses and transplanted to the field at the age of two to four weeks in order to prolong the growing season. The sudden exposure to outdoor conditions including altered temperature, radiation levels and rainfall events is extremely stressful for non-acclimated seedlings. Particularly the increase in ultraviolet-B radiation is considered a serious threat. A new approach to pre-acclimate seedlings to ambient ultraviolet-B radiation is the use of ultraviolet-B transparent covering materials. In order to estimate the benefit of UV-B pre-acclimation, lettuce plants were raised in greenhouses covered with three different materials varying in ultraviolet-B transmittance and transplanted to the field at the age of three weeks. Ultraviolet-B exposure during the greenhouse period led to a reduction in growth (leaf length, leaf area and leaf number) and an increase in flavonoid content. Transplantation to the field induced a strong enhancement in flavonoid content and a severe growth reduction overriding differences between UV-B treatment groups within a few days. At the time of harvest plant fresh weight was therefore independent from previous ultraviolet-B treatment. Effects of UV-B acclimation on plant performance immediately after transplantation require more detailed examination.
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000015910 65320 $$2Author$$aLactuca sativa
000015910 65320 $$2Author$$abiomass
000015910 65320 $$2Author$$aflavonoids
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000015910 65320 $$2Author$$alettuce
000015910 65320 $$2Author$$aUV-B radiation
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000015910 7001_ $$0P:(DE-Juel1)VDB74003$$aTittmann, S.$$b1$$uFZJ
000015910 7001_ $$0P:(DE-Juel1)VDB2595$$aWalter, A.$$b2$$uFZJ
000015910 7001_ $$0P:(DE-Juel1)129402$$aSchurr, U.$$b3$$uFZJ
000015910 7001_ $$0P:(DE-HGF)0$$aNoga, G.$$b4
000015910 7001_ $$0P:(DE-Juel1)VDB63395$$aUlbrich, A.$$b5$$uFZJ
000015910 773__ $$0PERI:(DE-600)2109402-0$$gVol. 75, p. 259 - 268$$p259 - 268$$q75<259 - 268$$tEuropean Journal of Horticultural Science$$v75$$y2010
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000015910 9132_ $$0G:(DE-HGF)POF3-582$$1G:(DE-HGF)POF3-580$$2G:(DE-HGF)POF3-500$$aDE-HGF$$bKey Technologies$$lKey Technologies for the Bioeconomy$$vPlant Science$$x0
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