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The effect of thermal accumulation on anthesis rate in apricot, apple, peach, and tart cherry flowers during dormancy, dormancy release, and normal anthesis was determined. Data from several studies in warm and cold climates have indicated that thermally driven anthesis has an early low-temperature optimum that rises during anthesis. This is not true. Erroneous interpretation of results may have been due to inadequate measurements of the endodormancy status of seeds and buds. After endodormancy, flower-bud development temperature responses follow a normal sigmoidal curve with small but significant contributions at temperatures as low as 2C. The grand phase of the growth curve occurs between 16 and 20C in tart cherry. Asymptotic growth vs. temperature responses occurred at  22C, with minima near 0 and optima &gt;24C. These data indicate that asymmetric curvilinear anthesis models need to be fitted to each species.

ANALYSIS OF FLOWER BUD DEVELOPMENT TEMPERATURE RESPONSE CURVES OF ORCHARD SPECIES