Arabidopsis Flavonoid Mutants Are Hypersensitive to UV-B Irradiation.

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ID: 300137
1993
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Abstract
Increases in the terrestrial levels of ultraviolet-B (UV-B) radiation (280 to 320 nm) due to diminished stratospheric ozone have prompted an investigation of the protective mechanisms that contribute to UV-B tolerance in plants. In response to UV-B stress, flowering plants produce a variety of UV-absorptive secondary products derived from phenylalanine. Arabidopsis mutants with defects in the synthesis of these compounds were tested for UV-B sensitivity. The transparent testa-4 (tt4) mutant, which has reduced flavonoids and normal levels of sinapate esters, is more sensitive to UV-B than the wild type when grown under high UV-B irradiance. The tt5 and tt6 mutants, which have reduced levels of UV-absorptive leaf flavonoids and the monocyclic sinapic acid ester phenolic compounds, are highly sensitive to the damaging effects of UV-B radiation. These results demonstrate that both flavonoids and other phenolic compounds play important roles in vivo in plant UV-B protection.
Reference Key
openalex_W2160607514 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Jun Li, Tsai-Mei Ou-Lee, R. Raba, Ronald Amundson, Robert L. Last
Journal The Plant cell
Year 1993
DOI
10.1105/tpc.5.2.171
URL
https://doi.org/10.1105/tpc.5.2.171
Keywords Keywords not found

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