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Ultraviolet radiation changes plant color.

Kim Valenta1, Kristin Dimac-Stohl2, Frances Baines3

  • 1Department of Anthropology, University of Florida, Turlington Hall, PO Box 117305, Gainesville, FL, 32611-7305, USA. kimvalenta@ufl.edu.

BMC Plant Biology
|June 5, 2020
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Summary
This summary is machine-generated.

Plants exposed to ultraviolet (UV) radiation may increase their UV-B reflectance to protect tissues. Conversely, plants shielded from UV radiation downregulate this UV-B reflectance, suggesting a protective strategy.

Keywords:
Plant adaptive responsesPlant reflectancePlant reproductionUV-BUltraviolet radiation

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Area of Science:

  • Plant biology
  • Photoprotection strategies
  • UV radiation effects on plants

Background:

  • Plants possess mechanisms to mitigate damage from ultraviolet (UV) radiation, especially UV-B (280-320 nm).
  • Phenolic compounds are known plant UV-absorbing protectants.
  • UV reflectance as a protective strategy has not been previously investigated.

Purpose of the Study:

  • To investigate the phenomenon of UV reflectance in plants as a protective mechanism.
  • To determine if plants alter their UV-B reflectance in response to UV exposure.

Main Methods:

  • A controlled experiment exposed Zinnia Profusion Series plants to UV radiation or shielded them from light < 400 nm for 42 days.
  • Leaf and flower reflectance were measured using spectroscopy.
  • UV-B reflectance was compared before and after the treatment period.

Main Results:

  • Plants shielded from UV radiation exhibited decreased UV-B reflectance.
  • Plants exposed to increased UV levels showed a trend towards increased UV-B reflectance.

Conclusions:

  • Increased UV-B reflectance may serve as a protective strategy for plant leaves against high-energy UV-B radiation.
  • Upregulation of UV-B reflecting pigments or structures is a potential plant defense mechanism.