Peptides Regulating Plant Vascular Development
Cell-to-cell communication is a fundamental mechanism for maintaining homeostasis of the plant meristems. Cellular proliferation and differentiation in the vascular meristem are regulated by hormonal signals and secreted peptides. Recent studies have highlighted the importance of an intercellular signaling pathway consisting of a CLE peptide TDIF and its receptor PXY/TDR (PHLOEM INTERCALATED WITH XYLEM/TDIF receptor) in determining the fates of procambial cells (vascular stem cells), namely self-renewal or commitment to differentiation. The comparison of the TDIF TDR signaling pathways with the CLAVATA pathways revealed common and distinct features of homeostasis between these two meristems. Some other CLE peptides are recently found to function in xylem development via modification of plant hormone signaling. Here, emerging concepts of how intercellular peptide signals regulate vascular cell communities in global geometry are summarized.
KeywordsShoot Apical Meristem Vascular Development Stem Cell Maintenance Cytokinin Signaling Procambial Cell
I thank S. Betsuyaku for critical reading of this manuscript. This work was supported in part by Grants-in-Aid from the Ministry of Education, Science, Sports and Culture of Japan (19060 009), from the Japan Society for the Promotion of Science (23227001), and from Bio-oriented Technology Research Advancement Institution (BRAIN).
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