Photosynthesis promotes the expression of TOPOISOMERASE1α, which in turn represses TARGET OF RAPAMYCIN (TOR) expression at the root tip. Glucose-TOR regulates cell division at the quiescent centre, and phosphorylates and stabilizes PLETHORA2 in columella cells to maintain root tip homeostasis.
- Hao Zhang
- Lin Guo
- Xigang Liu