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  • 1.
    Kalbin, Georgi
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Li, Shaoshan
    Örebro universitet, Institutionen för naturvetenskap.
    Olsman, Helena
    Örebro universitet, Institutionen för naturvetenskap.
    Pettersson, Mikael
    Engwall, Magnus
    Örebro universitet, Institutionen för naturvetenskap.
    Strid, Åke
    Örebro universitet, Institutionen för naturvetenskap.
    Effects of UV-B in biological and chemical systems: equipment for wavelength dependence determination2005Ingår i: Journal of Biochemical and Biophysical Methods, ISSN 0165-022X, E-ISSN 1872-857X, Vol. 65, nr 1, s. 1-12Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The thinning of the stratospheric ozone layer has prompted a large number of studies of UV-B-induced effects in biological and chemical systems. The wavelength dependency of such effects is of interest from mechanistic, physiological or economic points of view. Here, we describe an apparatus for determining the wavelength dependency of UV-B effects in biological and chemical systems. The apparatus consists of a high intensity UV radiation source and narrow bandpass filters to produce UV radiation in even intervals (between 280 and 360 nm). The usefulness of the equipment is demonstrated in two different systems: 1) Chalcone synthase (CHS) gene is up-regulated by UV-B radiation. Therefore quantitative analysis of the CHS gene expression was chosen in the present investigation for studies of the wavelength dependency of gene expression regulation in plants. Maximum induction of CHS expression was found at 300 nm with a 12-fold induction compared with the control; 2) The wavelength dependency of formation of dioxin-like photoproducts from the brominated flame retardant decabrominated diphenyl ether (DeBDE) is described. This is an example of UV-B-induced conversion of non-toxic species into a number of products of which some may be toxic in the environment. In the UV interval studied, the highest dioxin-like activity was found in the sample irradiated at 330 nm and therefore this wavelength is most important for the mechanism involved in photoconversion of DeBDE.

  • 2.
    Kalbina, Irina
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Li, Shaoshan
    Örebro universitet, Institutionen för naturvetenskap.
    Kalbin, Georgi
    Örebro universitet, Institutionen för naturvetenskap.
    Björn, Lars Olof
    Strid, Åke
    Örebro universitet, Institutionen för naturvetenskap.
    Two separate UV-B radiation wavelength regions control expression of different molecular markers in Arabidopsis thaliana2008Ingår i: Functional Plant Biology, ISSN 1445-4408, E-ISSN 1445-4416, Vol. 35, nr 3, s. 222-227Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fluence-response curves were obtained at nine wavelengths in the interval 280-360 nm for mRNA transcripts of four molecular markers induced by ultraviolet-B (UV-B) radiation in Arabidopsis thaliana: CHS (encoding chalcone synthase), PDX1.3 (encoding an enzyme involved in formation of pyridoxine), MEB5.2 (encoding a protein with unknown function but which is strongly up-regulated by UV-B), and LHCB1*3 (encoding a chlorophyll a/b binding protein). Intact Arabidopsis plants were irradiated for 3h using a high intensity deuterium radiation source and narrow bandwith filters (Kalbin et al. 2005, J. Biochem. Biophys. Meth. 65, 1-12) without supplementary PAR. The results obtained suggest the existence of two distinct UV-B signal responses: one sensitive between 300 and 310 nm and the other sensitive around 280-290 nm. Among the investigated molecular markers, CHS and PDX1.3 were regulated through the chromophore absorbing around 300 nm, whereas MEB5.2 and LHCB1*3 were regulated through the chromophore absorbing at 280-290 nm. The results obtained show that at least two signal transduction pathways exist that regulate gene expression as a result of absorption of UV-B radiation in plants.

  • 3.
    Li, Shaoshan
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Strid, Åke
    Örebro universitet, Institutionen för naturvetenskap.
    Anthocyanin accumulation and changes in CHS and PR-5 gene expression in Arabidopsis thaliana after removal of the inflorescence stem (decapitation)2005Ingår i: Plant physiology and biochemistry (Paris), ISSN 0981-9428, E-ISSN 1873-2690, Vol. 43, nr 6, s. 521-525Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Anthocyanin accumulation occurs in rosette leaves of Arabidopsis thaliana within 8 days after removal of the inflorescence stem. Expression of stress-induced genes CHS and PR-5 was strongly up-regulated by stem removal, and was highest on day 4 after decapitation. These levels were 10 and 5 times higher than in the control, respectively. No obvious difference was found in expression of LHCB, MEB5.2, or PYROA genes following stem removal. We demonstrate that removing the inflorescence stem triggers events in Arabidopsis, including pigment accumulation and changes in gene expression of a subset of stress-induced genes, in a tissue distant from the wound site.

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