n this study, drought stress inhibited corn seedling growthbut increased root soluble carbohydrate concentration and rootactivity. Post- drought rewatering increased corn growth, and com-pensatory growth simultaneously occurred with the addition ofNO3−to roots. By contrast, no compensatory growth occurredwithout the addition of NO3−to roots. Upon addition of NO3−toroots, post-drought rewatering increased the cytokinin contents ofleaves and its delivery rate from roots to leaves. In summary, theconcentration of root-derived cytokinin in leaves directly affectedcompensatory growth of corn upon post-drought rewatering at theseedling stage.