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UV-B Effects: Receptors and Targets

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Book cover Concepts in Photobiology

Summary

Evidence is presented that there is a signalling pathway for UV-B (ultraviolet-B radiation) effects on gene activity that differs from that of the UV-A/blue light signalling pathway. Evidence is also presented for a specific UV-B receptor pigment, with peak sensitivity near 290 nm, which is active in growth regulation and induction of UV-protecting pigmentation. A possible chromophore in this photoreceptor is a tetrahydropterin derivative. There are many interactions between this UV-B photoreceptor and other photoreceptors in plants, and some of the effects mediated by the UV-B receptor may not take place via gene regulation. UV-B regulation of genes may also proceed via photon absorption in DNA. Various types of radiation-induced changes in DNA are discussed, and the conclusion drawn that the most important one is formation of (6-4) photoproducts of pyrimidine bases in DNA. Calculations show that stratospheric ozone depletion of realistic magnitude does not cause significant increase in excitation of the 290 nm UV-B photoreceptor, in contrast to photon absorption in DNA.

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Author information

Authors and Affiliations

  1. Department of Plant Physiology, University of Lund, Box 117, S-221 00, Lund, Sweden

    L. O. Björn

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  1. L. O. Björn
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Editor information

Editors and Affiliations

  1. School of Life Sciences, Jawaharlal Nehru University, New Delhi, India

    G. S. Singhal

  2. Technische Universität, Berlin, Germany

    G. Renger  & K.-D. Irrgang  & 

  3. International Centre for Genetic Engineering and Biotechnology, New Delhi, India

    S. K. Sopory

  4. University of Illinois at Urbana Champaign, Urbana, IL, USA

    Govindjee

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© 1999 Springer Science+Business Media Dordrecht

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Björn, L.O. (1999). UV-B Effects: Receptors and Targets. In: Singhal, G.S., Renger, G., Sopory, S.K., Irrgang, KD., Govindjee (eds) Concepts in Photobiology. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4832-0_27

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  • DOI: https://doi.org/10.1007/978-94-011-4832-0_27

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-6026-4

  • Online ISBN: 978-94-011-4832-0

  • eBook Packages: Springer Book Archive

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