Optical Properties of Berry Epicuticular Waxes in Four Georgian Grape Cultivars (Vitis vinifera L.)

  • L. Rustioni Università degli Studi di Milano, CIRIVE – Centro Interdipartimentale di Ricerca per l’Innovazione in Viticoltura ed Enologia, via Celoria 2, I-20133 Milano, Italy
  • D. Maghradze Institute of Horticulture, Viticulture and Oenology, 6 Marshal Gelovani Ave., 0159 Tbilisi, Georgia
  • O. Failla Università degli Studi di Milano, CIRIVE – Centro Interdipartimentale di Ricerca per l’Innovazione in Viticoltura ed Enologia, via Celoria 2, I-20133 Milano, Italy
DOI: https://doi.org/10.21548/33-2-1111

Abstract

The epidermis of plant shoot organs is generally covered by epicuticular waxes. The role of this layer is
related mainly to the protection of the inner tissues from biotic and abiotic stresses. In this study, attention
is focused on the optical properties of the berry epicuticular waxes of the grapevine (Vitis vinifera L.) at
fruit ripening. The reflectance of the berry surface was measured before and after chloroform treatments
in four Georgian grape cultivars grown in northern Italy. Epicarp optical properties were underlined
at different wavelengths (341 to 1025 nm) for each cultivar. The results show that the berry waxes have
several optical properties; it is possible that their main eco-physiological effect is to provide specific
protection against different types of radiation. Besides the physiological aspects, the results are interesting
also from a technical point of view in the field of interpretation of reflectance measurements carried out by
non-invasive instruments.

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Published
2016-11-02
Issue
Vol. 33 No. 2 (2012)
Section
Articles

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