Chlorophyll Fluorescence Imaging for the Noninvasive Assessment of Anthocyanins in Whole Grape (Vitis vinifera L.) Bunches

Authors

  • Giovanni Agati,

    Corresponding author
    1. Istituto di Fisica Applicata ‘Nello Carrara’, Consiglio Nazionale delle Ricerche, Florence, Italy
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  • Maria Laura Traversi,

    1. Istituto per la Valorizzazione del Legno e delle Specie Arboree (IVALSA), Consiglio Nazionale delle Ricerche, Florence, Italy
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  • Zoran G. Cerovic

    1. Equipe de Biospectroscopie Végétale, Laboratoire d’Ecologie Systématique et Evolution, CNRS, UMR 8079, Université Paris-Sud, Orsay Cedex, France
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  • This invited paper is part of the Series: Applications of Imaging to Biological and Photobiological Systems.

*Corresponding author email: g.agati@ifac.cnr.it (Giovanni Agati)

Abstract

The distribution of anthocyanins in grape (Vitis vinifera L.) bunches from the Sangiovese cultivar was measured nondestructively by chlorophyll fluorescence imaging using two excitation light bands at 550 and 650 nm in sequence. The pixel intensity in the derived logarithm of the fluorescence excitation ratio image was directly related, by an exponential function (r2 = 0.93), to the anthocyanin concentration of berry extracts. The method will be useful for the assessment of the heterogeneity of anthocyanin accumulation in berries that is known to depend on physiologic and climatic factors. It can also represent a new, rapid and noninvasive technique for the assessment of grape ripening and the appropriate time of harvest.

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