Plant Vascular Cell Division Is Maintained by an Interaction between PXY and Ethylene Signalling

• DOI: 10.1371/journal.pgen.1002997
• Publication Date: 2012-11-15T21:52:54Z
• Authors: J. Peter Etchells; Claire M. Provost; Simon R. Turner
• Keywords: Vascular cambium; Vascular tissue

The procambium and cambium are meristematic tissues from which vascular tissue is derived. Vascular initials differentiate into phloem towards the outside of stem xylem inside. A small peptide derived CLV-3/ESR1-LIKE 41 (CLE41) thought to promote cell divisions in meristems by signalling through PHLOEM INTERCALLATED WITH XYLEM (PXY) receptor kinase. pxy mutants, however, display only reductions number, suggesting a mechanism exists that allows plants compensate for absence PXY. Consistent with this idea, we identify large number genes specifically upregulated including several AP2/ERF transcription factors. These factors required normal division procambium. same also ethylene ethylene-overproducing eto1 mutants. mutants exhibit an increase dependent upon function at least 2 these ERF genes. Furthermore, blocking using variety insensitive such as ein2 enhances defect pxy. Our results suggest define novel pathway acts parallel PXY/CLE41 regulate developing tissue. We propose model whereby regulated both PXY ethylene/ERF signalling. Under circumstances, repress pathway.