Intra- and interspecific differences of 10 barley and 10 tomato cultivars in response to short-time UV-B radiation: A study analysing thermoluminescence, fluorescence, gas-exchange and biochemical parameters |
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Authors: | Matthias Gilbert Yvonne Pörs Kirsten Grover |
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Institution: | a University of Leipzig, Institute of Biology I, Plant Physiology, Johannisallee 21-23, D-04103 Leipzig, Germany b Humboldt University Berlin, Institute of Biology, Cell Biology, Invalidenstraße 42, D-10115 Berlin, Germany c Humboldt University Berlin, Institute of Biology, Plant Physiology, Philippstraße 13, D-10115 Berlin, Germany d Helmholtz Zentrum München - German Research Center for Environmental Health, Institute of Soil Ecology, Department of Environmental Engineering, Ingolstädter Landstraße 1, D-85764 Neuherberg, Germany e Helmholtz Zentrum München - German Research Center for Environmental Health, Program Planning and Management Department, Ingolstädter Landstraße 1, D-85764 Neuherberg, Germany |
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Abstract: | The impact of UV-B radiation on 10 genotypically different barley and tomato cultivars was tested in a predictive study to screen for potentially UV-tolerant accessions and to analyze underlying mechanisms for UV-B sensitivity. Plant response was analyzed by measuring thermoluminescence, fluorescence, gas exchange and antioxidant status. Generally, barley cultivars proved to be much more sensitive against UV-B radiation than tomato cultivars. Statistical cluster analysis could resolve two barley groups with distinct differences in reaction patterns. The UV-B sensitive group showed a stronger loss in PSII photochemistry and a lower gas-exchange performance and regulation after UV-B radiation compared to the more tolerant group. The results indicate that photosynthetic light and dark reactions have to play optimally in concert to render plants more tolerant against UV-B radiation. Hence, measuring thermoluminescence/fluorescence and gas exchange in parallel will have much higher potential in identifying tolerant cultivars and will help to understand the underlying mechanisms. |
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Keywords: | Abiotic stress Crop plants Photosynthesis Thermoluminescence UV-B |
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