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Freeze tests were performed on stem sections of  Fraxinus americana, Lagerstroemia indica Magnolia gradiflora, Rhododendron  `Red Ruffle',  Zelkova serrata,  and leaves of  Magnolia grandiflora  and Rhododendron `Red Ruffle' in the tinter and summer of 1993. Freeze injury was quantified using electrolyte and phenolic leakage techniques and compared to the lethal temperature range determined by visual method assisted by differential thermal analysis. Richards function was fitted to the electrolyte and phenolic leakage data by the modified Gauss-Newton method. The inflection point of the Richards function coincided with the lethal injury range for non-acclimated leaves, but overestimated the freeze tolerance for acclimated leaves and for both acclimated and non-acclimated stems. A proposed interception point of the lower asymptote and a line tangential to the curve inflection point provided an improved estimate of the lethal injury range in most of the species.

563 PB 412 RICHARDS FUNCTION IN FREEZING TOLERANCE DETERMINATION WITH ELECTROLYTE AND PHENOLIC LEAKAGE TECHNIQUES