摘要The root system of Arabidopsis thaliana comprises primary,lateral,and adventitious roots.Different types of roots are formed by diverse inductive cues and developmental programs.Here,we adopted the CRE/LOX system to trace cell lineage during the three types of root formation under the control of the promoter of WUSCHEL-RELATED HOMEOBOX5.The results show that the cells forming adventitious roots during de novo root regeneration from detached leaves and lateral roots from the primary root are descendants of the WOX5-expressing root primordium.During the post-embryonic growth of the primary root,some vascular and root cap cells are descendants of the WOX5-expressing stem cell niche in the root apical meristem.Overall,our data suggest that the CRE/LOX system is a useful tool to trace cell lineage in different types of root organogenesis.