Abstract:

Abstract: In order to explore the relationship between the starch content and starch phosphorylase (SP) activity in lily bulbs, bulbs of Lilium davidii var.unicolor and Asian lily were used to determine the changes of starch content and SP activity both in mother scales and daughter scales during bulb development. The results showed that the content of starch in the both two mother bulbs were declined before the leaf-expansion period, then soared and reached its highest on 40 d after leaf-expansion, and then decreased again. Besides, Asian lily showed an obvious downward trend. The starch content in both two daughter bulbs increased in general, and Asian lily got to its maximum at withered stage while Lilium davidii var.unicolor at half withered stage. The accumulation of starch was positively correlated with the SP content, and the trends of starch content in both lilies were consistent with SP during bulb development. The phenomenon that the maximum of starch content was not with the highest SP activity indicates that SP was in relation to starch biosynthesis in lily bulbs, but not the only enzyme.