The changes of the contents of endogenous polyamines of synchronic materials at different developmental stages in somatic embryogenesis were measured by high-performance liquid chromatography(HPLC) in longan.The results showed that the levels of endogenous polyamines in embryogenic calli were higher than those in non-embryogenic calli;the changes of endogenous polyamines in the process of somatic embryogenesis approximately showed an M curve during embryogenic callus Ⅱ and globular embryoids;the content of ...