, Volume 194, Issue 4, pp 498–503 | Cite as

Accumulation of UV-absorbing flavonoids induced by UV-B radiation in Arabidopsis thaliana L.

I. Mechanisms of UV-resistance in Arabidopsis
  • Rodrigo Lois


Irradiation of Arabidopsis with ultraviolet (UV) light resulted in intensity- and wavelength-dependent increases in the levels of a small family of UV-absorbing flavonoids, which accumulate in the aerial parts of the plants. A gradient of sensitivity to UV-B radiation is described in the different leaves of developingArabidopsis plants whereby the earliest formed leaves become damaged by UV-B faster and more extensively than later formed leaves. This UV-sensitivity gradient tightly parallels differences in constitutive as well as UV-induced levels of flavonoid accumulation among the various leaves, suggesting a direct role of flavonoids in protection against damage by UV radiation. The level of accumulated flavonoids, both constitutive and UV-induced, in each leaf appear to be dependent on the specific developmental state of each leaf as well as the overall developmental state of the plant. The UV-mediated flavonoid response, along with the observed UV-induced damage, appear not to be systemic in Arabidopsis but restricted very closely to the irradiated areas of leaves.

Key words

Arabidopsis Development Flavonoid Tolerance (UV light) Ultraviolet light 


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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • Rodrigo Lois
    • 1
  1. 1.Department of Biological ScienceCalifornia State UniversityFullertonUSA

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