Contents of carbohydrates and endogenous hormones from dormancy to sprouting of Toona sinensis buds were measured. Dynamic changes of GA 1/3 , iPA and ABA were detected. GA 1/3 and iPA decreased when the dormancy bega...Contents of carbohydrates and endogenous hormones from dormancy to sprouting of Toona sinensis buds were measured. Dynamic changes of GA 1/3 , iPA and ABA were detected. GA 1/3 and iPA decreased when the dormancy began, and then increased to the highest value before bud sprouting. The lowest value of GA 1/3 , 358 7 ng·g -1 FW, was observed 21 days after leaf falling, whereas ABA was the highest, 201 5 ng g -1 FW. Thereafter, ABA decreased and GA 1/3 increased with the advent of bud sprouting. Ratios of GA/iPA and iPA/ABA decreased first and then increased from dormancy to sprouting with minor change range compared with GA 1/3 , iPA and ABA. This demonstrated that dormancy break was closely related to hormone change, concurrent with starch degradation and increase in soluble sugars.展开更多
文摘Contents of carbohydrates and endogenous hormones from dormancy to sprouting of Toona sinensis buds were measured. Dynamic changes of GA 1/3 , iPA and ABA were detected. GA 1/3 and iPA decreased when the dormancy began, and then increased to the highest value before bud sprouting. The lowest value of GA 1/3 , 358 7 ng·g -1 FW, was observed 21 days after leaf falling, whereas ABA was the highest, 201 5 ng g -1 FW. Thereafter, ABA decreased and GA 1/3 increased with the advent of bud sprouting. Ratios of GA/iPA and iPA/ABA decreased first and then increased from dormancy to sprouting with minor change range compared with GA 1/3 , iPA and ABA. This demonstrated that dormancy break was closely related to hormone change, concurrent with starch degradation and increase in soluble sugars.
