Partitioning photoperiod- and chilling-driven cold hardiness in a Vitis riparia × V. vinifera F1 population
- 1Department of Plant Sciences, North Dakota State University , , ,
- 2US Department of Agriculture, Agricultural Research Service, Crop Diseases , , ,
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.
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BibTeX
@article{delavar2026partitioning,
title = {{Partitioning photoperiod- and chilling-driven cold hardiness in a Vitis riparia × V. vinifera F1 population}},
author = {Hava Delavar and Ozkan Kaya and Summaira Riaz and Harlene Hatterman-Valenti},
journal = {Frontiers in plant science},
year = {2026},
month = sep,
doi = {10.3389/fpls.2026.1916819},
url = {https://europepmc.org/article/PMC/PMC13662123},
note = {CC BY},
}
RIS
TY - JOUR
TI - Partitioning photoperiod- and chilling-driven cold hardiness in a Vitis riparia × V. vinifera F1 population
AU - Hava Delavar
AU - Ozkan Kaya
AU - Summaira Riaz
AU - Harlene Hatterman-Valenti
PY - 2026
DA - 2026/09/30
JO - Frontiers in plant science
DO - 10.3389/fpls.2026.1916819
UR - https://europepmc.org/article/PMC/PMC13662123
AB - 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.
SN - 1664-462X
ER -