{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T06:56:20Z","timestamp":1790751380608,"version":"4.1.0"},"reference-count":50,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T00:00:00Z","timestamp":1790726400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Plant Sci."],"abstract":"<jats:p>\n                    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\n                    <jats:italic>Vitis riparia<\/jats:italic>\n                    \u00d7\n                    <jats:italic>Vitis vinifera<\/jats:italic>\n                    F\n                    <jats:sub>1<\/jats:sub>\n                    population by differential thermal analysis across three environments (a California vineyard, an NDSU field, and an NDSU greenhouse), sampled nine times through the 2023\u20132024 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 (\u2264 \u221221.4\u00a0\u00b0C) to very susceptible (\u2265 \u221213.4\u00a0\u00b0C). Field vines reached a midwinter maximum of \u221222.7\u00a0\u00b0C, whereas greenhouse vines were most susceptible (\u221214.6\u00a0\u00b0C), and nine genotypes were hardier than the tender parent. Genotype accounted for only 7% of the phenotypic variance, giving a low single-observation heritability (H\u00b2i = 0.07) but a moderate entry-mean heritability (H\u00b2c = 0.49), which are distinct statistics reported separately. The seasonal trajectory was well described by logistic and response-surface models (R\u00b2 = 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 \u22486.7\u00a0\u00b0C 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\u00a0\u00b0C 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\u2013stability 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.\n                  <\/jats:p>","DOI":"10.3389\/fpls.2026.1916819","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T06:06:19Z","timestamp":1790748379000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Partitioning photoperiod- and chilling-driven cold hardiness in a Vitis riparia \u00d7 V. vinifera F1 population"],"prefix":"10.3389","volume":"17","author":[{"given":"Hava","family":"Delavar","sequence":"first","affiliation":[{"name":"Department of Plant Sciences, North Dakota State University","place":["Fargo, ND, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ozkan","family":"Kaya","sequence":"additional","affiliation":[{"name":"Department of Plant Sciences, North Dakota State University","place":["Fargo, ND, United States"]},{"name":"Department of Life Sciences, Western Caspian University","place":["Baku, Azerbaijan"]},{"name":"Erzincan Horticultural Research Institute, Republic of Turkey Ministry of Agriculture and Forestry","place":["Erzincan, T\u00fcrkiye"]},{"name":"Department of Horticulture and Agronomy, Faculty of Agriculture, Kyrgyz-Turkish Manas University","place":["Bishkek, Kyrgyzstan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Summaira","family":"Riaz","sequence":"additional","affiliation":[{"name":"US Department of Agriculture, Agricultural Research Service, Crop Diseases","place":["Parlier, CA, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Harlene","family":"Hatterman-Valenti","sequence":"additional","affiliation":[{"name":"Department of Plant Sciences, North Dakota State University","place":["Fargo, ND, United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,9,30]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"175","DOI":"10.5344\/ajev.1984.35.3.175","article-title":"Deep supercooling of dormant and deacclimating Vitis buds","volume":"35","author":"Andrews","year":"1984","journal-title":"Am. 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