Abstract: Using the method of hormone ELISA,internal hormone GA₃,IAA and ABA contents of potato minituber were measured at 3 storage temperatures and 4 different treatments,and the effect of the changes of GA₃,IAA and ABA contents on minituber dormancy was studied.The sprout stage of minituber treated with exogenous hormones and chemicals was observed at the different storage temperature.The results show that the changes of GA₃,ABA and IAA contents are undulated.Before sprouting,ABA content decreases,and GA₃ content increases.And their ratio is smaller followed dormancy breakage.Among the trials of exogenous hormones and chemicals,sulfourea is the best effective.When the minituber is soaked at 25 ℃ in 1% sulfourea for an hour,the minituber sproutes the earliest and it is strongly.In the condition of 10 mg/L GA₃ or 10 mg/L IAA+10 mg/L GA₃,the minituber can accelerate the dormancy breakage.Temperatures play a major role in promoting the sprouting of minitubers and the absorption and transforming of exogenous and chemicals.

Key words: Potato minituber, Dormancy, Hormone, Sprouting

CLC Number: 

• S532.041