Table 1 Estimated parameters (± SE) of a fitted logistic function for electrolyte leakage (EL) and temperature across Juglans cinerea provenances (USDA plant hardiness zones) and Juglans species/hybrids. Parameter a indicates maximum EL (%), b indicates minimum EL (%), c indicates the LT₅₀ (°C), and d indicates the inverse rate of cold damage by temperature. Upper case letters indicate differences among species. Lower case letters indicate differences within J. cinerea provenances. The global model utilized all possible data sets simultaneously to arrive at a single model that best fits all species/hybrids

From: Cold and heat tolerances of hybrids for restoration of the endangered Juglans cinerea L