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  • 1.
    Kalbina, Irina
    et al.
    Örebro University, Department of Natural Sciences.
    Li, Shaoshan
    Örebro University, Department of Natural Sciences.
    Kalbin, Georgi
    Örebro University, Department of Natural Sciences.
    Björn, Lars Olof
    Strid, Åke
    Örebro University, Department of Natural Sciences.
    Two separate UV-B radiation wavelength regions control expression of different molecular markers in Arabidopsis thaliana2008In: Functional Plant Biology, ISSN 1445-4408, E-ISSN 1445-4416, Vol. 35, no 3, p. 222-227Article in journal (Refereed)
    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.

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