{
  "abstract": "Rotundone is the main aroma compound responsible for peppery notes in wines. Its biosynthesis is negatively affected by heat and drought, whereas the impact of light, particularly ultraviolet (UV) radiation, remains unestablished. This study aimed to investigate, under field conditions, the effects of grape exposure and UV treatments on rotundone in Vitis vinifera L. cv. Tardif. During the warm 2022 season, four treatments were compared to a control using a randomised complete block design with three replicates per treatment: early defoliation at Eichhorn & Lorenz stage 32 (ED), late defoliation at stage 34 (LD), exclusion of UV-A and UV-B radiations on late-defoliated vines using radiation screens (LD-UV), and four UV-C modulated light applications during daytime between mid-veraison and harvest on late-defoliated vines (LD+UV). No differences were observed between the control and ED, likely due to leaf regrowth limiting the initial increase in cluster exposure. In contrast, the LD treatment resulted in a significant 33 % increase in rotundone. LD-UV did not affect bunch zone air temperature but caused a significant reduction in rotundone, highlighting the key role of UV in its biosynthesis. UV-C treatments applied during daytime had no effect, whereas preliminary results on a limited number of fruiting cuttings suggest a substantial increase when treatments were applied at night. Overall, these results indicate that winegrowers cultivating Tardif can use late defoliation to enhance rotundone biosynthesis even during warm vintages. The effects of UV-C treatments warrant further validation on a larger number of vines under field conditions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 16,
  "authors": [
    {
      "name": "Olivier Geffroy"
    },
    {
      "name": "Thomas Baerenzung Dit Baron"
    },
    {
      "name": "Christian Chervin"
    },
    {
      "name": "Chloé Cuif"
    },
    {
      "name": "Marie Denat"
    },
    {
      "name": "Carole Feilhès"
    },
    {
      "name": "Élodie Gassiolle"
    },
    {
      "name": "Jeanne Laforge"
    },
    {
      "name": "Laura Lescot"
    },
    {
      "name": "Ricardo López"
    },
    {
      "name": "Ignacio Ontañón Alonso"
    },
    {
      "name": "Jean-Pierre Petit"
    },
    {
      "name": "Christine Roynette"
    },
    {
      "name": "Anthony Santacreu"
    },
    {
      "name": "Valérie Simon"
    },
    {
      "name": "Alban Jacques"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/84ytbsxt73gky.bib",
  "cited_by": 0,
  "doi": "10.20870/oeno-one.2026.60.3.9626",
  "fulltext_url": null,
  "id": "84ytbsxt73gky",
  "issns": [
    "2494-1271"
  ],
  "landing_url": "https://hal.science/hal-05767941v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.chim"
    ],
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      "hal",
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      "openalex",
      "1110|Horticultural and Viticultural Research"
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  "openalex": "W7166839094",
  "pdf_url": "https://hal.science/hal-05767941/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-01",
  "publisher": "International Viticulture and Enology Society (IVES)",
  "ris": "https://research.draconitic.com/paper/84ytbsxt73gky.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:50Z",
      "native_id": "hal-05767941",
      "source": "hal",
      "url": "https://hal.science/hal-05767941v1"
    }
  ],
  "subjects": [
    {
      "field": "biology",
      "origin": "hal:0.sdv",
      "subfield": "general"
    },
    {
      "field": "chemistry",
      "origin": "hal:1.chim.anal",
      "subfield": "analytical"
    },
    {
      "field": "medicine",
      "origin": "hal:1.sdv.aen",
      "subfield": "nutrition"
    }
  ],
  "title": "Assessment of grape exposure and UV radiation effects on rotundone in Vitis vinifera L. cv. Tardif under warm and dry vintage conditions",
  "title_text": "Assessment of grape exposure and UV radiation effects on rotundone in Vitis vinifera L. cv. Tardif under warm and dry vintage conditions",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:50Z",
  "url": "https://research.draconitic.com/paper/84ytbsxt73gky",
  "venue": "OENO One",
  "versions": []
}