The result showed that Inv and SS affected the growth of tobacco leaves at different stages, Inv at metaphase and SS at anaphase.

• 结果表明：转化酶和蔗糖合成酶对烟草叶片生长发育的作用时期不同，即转化酶在烟草叶片发育的中期，蔗糖合成酶在叶片发育后期。