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Chloroplast-located flavonoids can scavenge singlet oxygen

Authors

  • Giovanni Agati,

    1. Istituto di Fisica Applicata ‘Nello Carrara’, IFAC, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, I-50019, Sesto F.no, Firenze, Italy;
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  • Paolo Matteini,

    1. Istituto di Fisica Applicata ‘Nello Carrara’, IFAC, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, I-50019, Sesto F.no, Firenze, Italy;
    2. Dipartimento di Chimica Organica ‘Ugo Schiff’, Università di Firenze, Via della Lastruccia 13, I-50019 Sesto F.no, Firenze, Italy;
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  • Andrea Goti,

    1. Dipartimento di Chimica Organica ‘Ugo Schiff’, Università di Firenze, Via della Lastruccia 13, I-50019 Sesto F.no, Firenze, Italy;
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  • Massimiliano Tattini

    1. Istituto per la Valorizzazione del Legno e delle Specie Arboree, IVALSA, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, I-50019, Sesto F.no, Firenze, Italy
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Author for correspondence: Massimiliano Tattini Tel: +39 0555225 692 Fax: +39 0555225 656 Email: m.tattini@ivalsa.cnr.it

Summary

  • • The hypothesis was tested that flavonoids may scavenge singlet oxygen (1O2) in mesophyll cells of Phillyrea latifolia exposed to excess-light stress.
  • • In cross-sections taken from leaves developed at 10% (shade) or 100% (sun) solar irradiance, we evaluated the excess photosynthetically active radiation (PAR)-induced accumulation of 1O2 in mesophyll cells by imaging the fluorescence quenching of the specific 1O2 probe N-[2-(diethylamino)ethyl]-N-[(2,5-dihydro-2,2,5,5-tetramethyl-1H-pyrrol-3-yl)methyl]-5-(dimethylamino)-1-naphthalenesulfonamide (DanePy). The intracellular location of flavonoids was also analyzed using three-dimensional deconvolution microscopy.
  • • Photo-induced quenching of DanePy fluorescence was markedly greater in the mesophyll of shade leaves than in that of sun leaves, the former showing a negligible accumulation of mesophyll flavonoids. The photo-induced generation of 1O2 was inversely related to the content of flavonoids in the mesophyll cells of sun leaves. Flavonoids were located in the chloroplasts, and were likely associated with the chloroplast envelope.
  • • Here we provide relevant evidence for the potential scavenger activity of chloroplast-located flavonoids against 1O2 and new insights into the photo-protective role of flavonoids in higher plants.

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