Response of Treatment of Paclobutrazol and Gibberellin on Architecture and Flowering ofDifferent Potted Armeniaca mume Cultivars

From July 2016 to January 2017, experiments were made on 3-year grafted potted Armeniaca mume ‘Suyalve’, A. mume ‘Guhongzhusha’and A. mume ‘Meiren’ with different concentrations (0, 500, 1000 and 1500 mg/L) of paclobutrazol. The result showed that increase in theconcentrations of paclobutrazol could inhibit the growth of A. mume ‘Suyalve’ and A. mume ‘Guhongzhusha’, especially the treatment with 1500mg/L paclobutrazol could evidently shorten branch and internode, but increase stem diameter. Tests were carried out on effect of differentconcentrations of gibberellin before natural flowering on flowering stage of A. mume ‘Suyalve’ under different temperatures. The resultsdemonstrated that lower gibberellin concentration could bring earlier flowering, and higher concentration could retard flowering at 15℃. At 20℃and 25℃, treatments of different concentrations of gibberellin had no effect on flowering stage. But under the same concentration of gibberellin,flowering rate had positive relation with air temperature. The experiment concluded that treatment of 2 000 mg/L of gibberellin at 25 ℃ had largerflower diameter.