Effects of four plant growth regulators on inducing seedless fruit and quality of Muscat Hamburg grape.

【Objective】Effects of plant growth regulators on inducing seedless Muscat Hamburg grape were investigated to provide seedless processing technique for Muscat Hamburg grape production in Guangxi. 【Method】Seven different treatments of 4 different rations and concentrations of GA3 , CPPU, ABA and KT30 were applied, with water as the control. Inflorescences with coincident growth were selected as experimental subjects randomly. First, spikes were immersed 2 days before flowering, and repeated 15 days later. After maturity, the single fruit weight, size, shape index, hardness, seedless percentage and total soluble solid were determined. 【Result】The seedless percentage was improved in all the seven treatments with the similar fruit size of the ordinary cultivated fruit. Treatment 1 produced the best fruit with seedless percentage of 86.0%. 【Conclusion】Seedless Muscat Hamburg grape can be induced by the plant growth regulators with different ratios and proportions. When the grape was first treated by GA3 (20 mg/L) two days before flowering, then treated by mixtures with GA3 . KT-30 and ABA at levels of 10 mg/L, 2 mg/L and 10 mg/L, the seedless fruit with identical size of ordinary cultivated fruit could be obtained.