Effect of Low Temperature on Physiological and Biochemical Changes of Zaohongzhu Floral Buds

The nectarine cultivar Zaohongzhu was adopted to carry on the physiological and biochemistry changes of floral buds in dormancy.The results showed that the carbohydrate content experienced jump-change,starch and soluble sugar had the contradict changes during the whole dormancy period;during dormancy release the protein content fell down sharply and the dissociative amino acid content rose sharply.The jump-change stage of the former four substances were consistent with the process of endodormancy.During the deep dormancy SOD activity was always lower;POD activity rose all the time during the whole dormancy period what indicated that the increase of SOD and POD activity may be one of the reasons of dormancy release.