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Proceedings Paper

Development of UV-B screening compounds in response to variation in ambient levels of UV-B radiation
Author(s): Joe H. Sullivan; Chenping Xu; Wei Gao; James R. Slusser
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Paper Abstract

The induction of UV-B screening compounds in response to exposure to UV-B radiation is a commonly reported response and is generally considered to be an adaptive response of plants for protection from UVinduced damage. However, a number of questions remain to be answered including the importance of qualitative and localization differences among species in providing protection, indirect consequences of changes in leaf secondary chemistry on ecological processes and the dose response of metabolite accumulation. In this study we utilized UV monitoring data provided on site by the USDA UV-B Monitoring and Research Program to monitor the changes in UV-screening compounds in soybeans under a range of UV-B levels due to natural variation in ambient UV-B radiation. Soybean cultivars Essex, Clark and Clark-magenta, an isoline of Clark that produces minimal levels of flavonols, were grown beneath shelters covered either with polyester to block most UV-B radiation or teflon which is nearly transparent in the UV range and harvested at regular intervals for pigment and protein analysis. Daily levels of weighted UV-B varied from <1 to >7 kJ m-2. Increases in UV-screening compounds showed a positive dose response to UV-B radiation in all cultivars with Essex showing the steepest dose response. UV-A also induced screening compounds in all species The hydroxycinnimates of the magenta isoline showed a steep dose response to UV-A and a rather constant (non dose specific) but small additional increment in response to UV-B. The Clark isoline, which produced primarily the flavonol quercetin, showed a dose response to UV-B intermediate between that of Clark-magenta and Essex. All three cultivars show similar tolerance to UV-B in field conditions indicating that UV-induced pigment production is adequate to protect them from excessive UV-B damage.

Paper Details

Date Published: 10 September 2005
PDF: 11 pages
Proc. SPIE 5886, Ultraviolet Ground- and Space-based Measurements, Models, and Effects V, 58860L (10 September 2005); doi: 10.1117/12.623738
Show Author Affiliations
Joe H. Sullivan, Univ. of Maryland, College Park (United States)
Chenping Xu, Univ. of Maryland, College Park (United States)
Wei Gao, USDA UV-B Monitoring and Research Program, Colorado State Univ. (United States)
James R. Slusser, USDA UV-B Monitoring and Research Program, Colorado State Univ. (United States)


Published in SPIE Proceedings Vol. 5886:
Ultraviolet Ground- and Space-based Measurements, Models, and Effects V
Germar Bernhard; James R. Slusser; Jay R. Herman; Wei Gao, Editor(s)

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