Fig. 1From: Cold and heat tolerances of hybrids for restoration of the endangered Juglans cinerea LElectrolyte leakage (EL) measured on excised twig segments of a Juglans species and their hybrids and b USDA plant hardiness zone provenances within J. cinerea following five low temperature treatments relative to maximum EL. Each point represents the EL (%) of an individual twig sample. Lines represent a logistic function fit for each species/zoneBack to article page