Changes in organic acid contents in longan embryogenic callus(EC) from 3 longan cultivars of ‘Honghezi',‘ Songfengben' and ‘ Miaoqiao' were measured during minimal growth conservation on 4 different culture media.The results showed that the accumulation peak time of the organic acid contents in 3 cultivars cultured on different media. The accumulation peaks of ‘ Honghezi' EC cultured on Medium A, B, C and D presented one peak. ‘Miaoqiao' EC cultured on Medium A and B had relatively stable acid contents whil...