论文部分内容阅读
In multicellular organisms, stem cell fates are precisely regulated by intercellular signals.Procambial/Cambial cells include plant vascular stem cells and give rise to xylem and phloem cells.We have indicated that these stem cells are maintained by an extracellular ligand and its cell surface receptor;tracheary element differentiation inhibitory factor (TDIF) and TDIF RECEPTOR (TDR), by both promoting stem cell proliferation and suppressing xylem cell differentiation from stem cells (1-4).