The electrofusion conditions of protoplasts between "Jigu 5" and "Shuyoul" were studied. It showed that the fusion frequency of protoplasts reached 21 % with the following parameters:alternate current (AC) 1 500 kHz,300 V/cm, direct current (DC) 2.5 KV/cm,DC pulse width (PW) 60μs, number of DC pulse 4 - 5 times, mannitol 10% and CaCl2 0.4 mmol...