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Red-osier dogwood sterns,  Cornus sericea  L., at ten different growth stages were subjected to a series of temperatures ranging from 25C to 60C by immersing them in a water bath for one hour. After heat treatments, the viability of internode tissues were determined by electrical conductivity and ethylene production. Heat tolerance was expressed as LT 50 , the temperature at which 50% of the tissues were injured. The results suggest that the LT 50  of dormant plants remained relatively constant, approximately 53C. During dormancy, heat stress did not stimulate ethylene production from internode tissues. In contrast, tissues from non-dormant plants exposed to heat stress produced increasing levels of ethylene reaching a peak at 40C followed by a steady decrease at higher temperatures. Application of 1-aminocyclopropane-1-carboxylic acid (ACC) to stem segments from dormant plants, following heat treatment, enhanced production of ethylene.

HEAT TOLERANCE AND ETHYLENE PRODUCTION IN RED-OSIER DOGWOOD STEM TISSUES AT DIFFERENT GROWTH STAGES