The dynamic changes of some biomacromolecules were measured in the process of somatic embryogenesis from embryogenic callus in longan(Dimocarpus longan Lour.).There were 2 peaks of starch accumulation in the process of somatic embryogenesis,the first time was at the stage of embryogenic callus,the second time was at the stage of globular embryoids;and a small raise appeared at the stage of torpedo-shaped embryoids,and the content of starch was slightly higher than those of heart-shaped embryoids and cotyled...