title: 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.
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.
authors.affiliation: University of Leipzig, Institute of Biology I, Plant Physiology, Johannisallee 21-23, D-04103 Leipzig, Germany. mgilbert@rz.uni-leipzig.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Gilbert
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Pörs
authors.forename: Kirsten
authors.initials: K
authors.lastname: Grover
authors.forename: Ilka
authors.initials: I
authors.lastname: Weingart
authors.forename: Jiri
authors.initials: J
authors.lastname: Skotnica
authors.forename: Bernhard
authors.initials: B
authors.lastname: Grimm
authors.forename: Harald K
authors.initials: HK
authors.lastname: Seidlitz
authors.forename: Christian
authors.initials: C
authors.lastname: Langebartels
authors.forename: Christian
authors.initials: C
authors.lastname: Wilhelm
mesh_terms: D000975:Antioxidants / Q000032:analysis; D001205:Ascorbic Acid / Q000032:analysis; D002245:Carbon Dioxide / Q000378:metabolism; D018556:Crops, Agricultural / Q000528:radiation effects*; D005453:Fluorescence; D001467:Hordeum / Q000235:genetics* / Q000378:metabolism / Q000528:radiation effects; D049449:Luminescence; D018551:Solanum lycopersicum / Q000235:genetics* / Q000378:metabolism / Q000528:radiation effects; D010100:Oxygen / Q000378:metabolism; D011836:Radiation Tolerance; D013045:Species Specificity; D014466:Ultraviolet Rays / Q000009:adverse effects*
chemical_list: D000975:Antioxidants; D002245:Carbon Dioxide; D001205:Ascorbic Acid; D010100:Oxygen