title: [Evaluation of root and bud cold hardiness of wine grape varieties based on temperature-injury relation].
abstract: A system for differential thermal analysis (DTA) was applied for low temperature exotherms (LTE) analysis of roots and buds of eight wine grape varieties, and the temperature-injury (LT-I) regression functions of buds, phloem and xylem of roots were established to evaluate the cold hardiness of roots and buds of the different varieties. The order of phloem 50% lethal temperature of the eight grapevines was Marselan > Cabernet Franc > Cabernet Sauvignon > Petit Manseng > Chardonnay > Cabernet Gernischt > Italian Riesling > Xiongyuebai. The xylem 50% lethal temperature of the different cultivars was in the order of Marselan > Chardonnay > Cabernet Sauvignon > Petit Manseng > Cabernet Franc > Cabernet Gernischt > Italian Riesling > Xiongyuebai. The order of bud 50% lethal temperature was Cabernet Sauvignon > Petit Manseng > Cabernet Gernischt > Cabernet Franc > Chardonnay > Italian Riesling > Marselan > Xiongyuebai. A comprehensive evaluation on cold hardiness of the different varieties was conducted by fuzzy membership function. For roots, Marselan was the poorest, and Xiongyuebai was the best. For buds, Cabernet Sauvignon, Cabernet Franc, Petit Manseng and Cabernet Gernischt were poorer, while Italian Riesling and Xiongyuebai were better.
mesh_terms: D003080:Cold Temperature; D052585:Phloem; D018517:Plant Roots / Q000502:physiology*; D027843:Vitis / Q000145:classification / Q000502:physiology*; D014920:Wine; D052584:Xylem