Wang, Ning and Bagdassarian, Kristine S. and Doherty, Rebecca E. and Kroon, Johannes T. and Connor, Katherine A. and Wang, Xiao Y. and Wang, Wei and Jermyn, Ian H. and Turner, Simon R. and Etchells, J. Peter (2019) 'Organ-specific genetic interactions between paralogues of the PXY and ER receptor kinases enforce radial patterning in Arabidopsis vascular tissue.', Development., 146 (10). dev177105 .
In plants, cells do not migrate. Tissues are frequently arranged in concentric rings, thus expansion of inner layers is coordinated with cell division and/or expansion of cells in outer layers. In Arabidopsis stems, receptor kinases, PXY and ER, genetically interact to coordinate vascular proliferation and organisation via inter-tissue signalling. The contribution of PXY and ER paralogues to stem patterning is not known, nor is their function understood in hypocotyls, which undergo considerable radial expansion. Here we show that removal of all PXY and ER gene-family members results in profound cell division and organisation defects. In hypocotyls, these plants failed to transition to true radial growth. Gene expression analysis suggested that PXY and ER cross- and inter-family transcriptional regulation occurs, but it differs between stem and hypocotyl. Thus PXY and ER signalling interact to coordinate development in a distinct manner in different organs. We anticipate that such specialised local regulatory relationships, where tissue growth is controlled via signals moving across tissue layers, may coordinate tissue layer expansion throughout the plant body.
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|Publisher Web site:||https://doi.org/10.1242/dev.177105|
|Date accepted:||23 April 2019|
|Date deposited:||03 May 2019|
|Date of first online publication:||17 May 2019|
|Date first made open access:||17 May 2020|
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