The determination of chilling requirement and changes of carbohydrate during dormancy for Chinese jujube.

摘要

In this paper, the chilling requirements of 30 cultivars of Chinese jujube were determined with three methods including <=7.2 degrees C, 0-7.2 degrees C and Utah model. The results indicated that the chilling requirements were 775-1737 h based on <=7.2 degrees C, 395-567 h on 0-7.2 degrees C and 399-580 C.U. on Utah model. Thirty cultivars could be divided into 4 types according to the data. The changes of starch and soluble sugar content were different during dormant period. The starch content decreased before the end of dormancy and increased after it. The contents of starch and soluble sugar remained nearly the same as that at the end of dormancy. Therefore, the chilling requirement and/or the content of carbohydrate could be used to determine dormant release date for Chinese jujube.