{
  "abstract": "Grapevine cold hardiness governs cultivar distribution and winter survival, and is a key constraint on viticulture in cold regions. We evaluated bud cold hardiness in a Vitis riparia × Vitis vinifera F ₁ population by differential thermal analysis across three environments (a California vineyard, an NDSU field, and an NDSU greenhouse), sampled nine times through the 2023–2024 dormant season. Mean low-temperature exotherms (LTEs) differed significantly among sampling times, and hierarchical clustering separated the genotypes into five hardiness classes defined by mean LTE, from very hardy (≤ −21.4 °C) to very susceptible (≥ −13.4 °C). Field vines reached a midwinter maximum of −22.7 °C, whereas greenhouse vines were most susceptible (−14.6 °C), and nine genotypes were hardier than the tender parent. Genotype accounted for only 7% of the phenotypic variance, giving a low single-observation heritability (H²i = 0.07) but a moderate entry-mean heritability (H²c = 0.49), which are distinct statistics reported separately. The seasonal trajectory was well described by logistic and response-surface models (R² = 0.99) and, on an accumulated-chilling axis, by a Weibull model (half-hardening at 184 chilling degree-days). A state-space model estimated the chilling contribution at ≈6.7 °C and identified three genotypes (536-078, 539-127, 536-142) that attained most of their hardiness under the short-day, moderate-cooling greenhouse regime without sub-zero exposure; because that regime combined shortening photoperiod with a 4 °C decline, these are described as short-day/low-temperature responsive rather than photoperiod-responsive. Mean hardiness and plasticity were uncorrelated, providing no evidence of a hardiness–stability trade-off. The December field and greenhouse samplings exposed the greatest among-genotype variance and are the most informative conditions for future QTL mapping; the nine genotypes hardier than the tender parent, and a hardy, stable subset, are identified as parents for cold-hardiness introgression.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Plant Sciences, North Dakota State University , , ,",
    "US Department of Agriculture, Agricultural Research Service, Crop Diseases , , ,"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Hava Delavar"
    },
    {
      "affs": [
        0
      ],
      "name": "Ozkan Kaya"
    },
    {
      "affs": [
        1
      ],
      "name": "Summaira Riaz"
    },
    {
      "affs": [
        0
      ],
      "name": "Harlene Hatterman-Valenti"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8w0rscswbtn40.bib",
  "cited_by": 0,
  "doi": "10.3389/fpls.2026.1916819",
  "fulltext_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13662123/?tool=EBI",
  "id": "8w0rscswbtn40",
  "issns": [
    "1664-462X"
  ],
  "landing_url": "https://europepmc.org/article/PMC/PMC13662123",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "1110|Horticultural and Viticultural Research"
    ]
  ],
  "openalex": "W7214949169",
  "pdf_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13662123/pdf/?tool=EBI",
  "pmcid": "PMC13662123",
  "pmid": null,
  "published": "2026-09-30",
  "publisher": "Frontiers Media SA",
  "ris": "https://research.draconitic.com/paper/8w0rscswbtn40.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:20Z",
      "native_id": "PMC:PMC13662123",
      "source": "europepmc",
      "url": "https://europepmc.org/article/PMC/PMC13662123"
    },
    {
      "first_seen": "2026-10-30T12:19:25Z",
      "native_id": "10.3389/fpls.2026.1916819",
      "source": "crossref",
      "url": "https://www.frontiersin.org/articles/10.3389/fpls.2026.1916819/full"
    }
  ],
  "subjects": [
    {
      "field": "biology",
      "origin": "openalex:1110|Horticultural and Viticultural Research",
      "subfield": "plant-biology"
    }
  ],
  "title": "Partitioning photoperiod- and chilling-driven cold hardiness in a Vitis riparia × V. vinifera F1 population",
  "title_text": "Partitioning photoperiod- and chilling-driven cold hardiness in a Vitis riparia × V. vinifera F1 population",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:19:25Z",
  "url": "https://research.draconitic.com/paper/8w0rscswbtn40",
  "venue": "Frontiers in plant science",
  "versions": []
}