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Soret fluorescence involved in Caryophyllales plants ultraviolet protection
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Jacinto Sáa,b, Mariia V. Pavliuka, Ahmed M. El-Zohrya, Daniel L. A. Fernandesa, Jens Föhlingera, Emad Mukhtara
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a Department of Chemistry, Ångström Laboratory, Uppsala University, Sweden
b Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland
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Abstract |
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Accumulation of betacyanins pigments in plants leaves of the Caryophyllales order upon ultraviolet irradiation has been observed for reasons not fully understood. The results presented herein suggest that this is a self-regulated defence mechanism against ultraviolet-induced damage. Betanin (the main accumulated pigment) protection mechanism involves to the fast dissipation of ultraviolet radiation energy via a radiative process from a S2 state to a ground state (S0), as confirmed by fluorescence measurements. This rare photo-physical decay mechanism provides clues for Caryophyllales plants unique evolutionary adaptation, and opens prospects for the development of novel and bio-inspired ultraviolet protecting agents.
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Keywords
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Caryophyllales order; UV-protection mechanism; Soret fluorescence; Unique evolutionary adaptation
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