Abstract: 【Objective】Making clearing the anti-frost capability for different developmental stages, different cultivar and different floral organs plays an important role in forecasting and preventing from late frost damage in apricot.【Method】With an artificial climate chamber simulating frost, the supercooling point and freezing point were determined in three apricot cultivars, and the degree of freezing damage were calculated.【Result and Conclusion】The anti-frost capability was relation to developmental stages, the result showed that young fruit stage was sensitive to forst, blooming stage take second place. Supercooling poin and freezing point varied with different cultivars and floral organs, which showed that the higher the anti-frost capability of apricot cultivar was, the lower supercooling point and freezing point were, and the higher the value between supercooling point and freezing point was. With respect to floral organs, supercooling point and freezing point of stamen and pistil were higher than petal, which may be in relationship with development and water content. Supercooling point frequency of petal was more dispersing than those of stamen and pistil, and supercooling point of petal was 1～2℃ lower than those of stamen and pistil. By keeping supercooling state, apricot flower could obviate freezing damage, but it was sensitive to freezing, and floral organs turned brown after freezing.

Key words: Apricot, Floral organs, Supercooling point, Freezing point