1. The Arabidopsis Receptor Kinase IRK Is Polarized and Represses Specific Cell Divisions in Roots
- Author
-
Cecilia Rodriguez-Furlan, Roya Campos, Jaimie M. Van Norman, and Jason Goff
- Subjects
Cell type ,Cell division ,Cell ,Meristem ,Arabidopsis ,Biology ,Plant Roots ,General Biochemistry, Genetics and Molecular Biology ,03 medical and health sciences ,0302 clinical medicine ,Gene Expression Regulation, Plant ,Cell polarity ,medicine ,Molecular Biology ,030304 developmental biology ,0303 health sciences ,Arabidopsis Proteins ,Cell Polarity ,Cell Differentiation ,Cell Biology ,biology.organism_classification ,Cell biology ,Multicellular organism ,medicine.anatomical_structure ,Stem cell ,030217 neurology & neurosurgery ,Intracellular ,Cell Division ,Developmental Biology ,Signal Transduction - Abstract
Development of multicellular organisms requires coordination of cell division and differentiation across tissues. In plants, directional signaling, and implicitly cell polarity, is proposed to participate in this coordination; however, mechanistic links between intercellular signaling, cell polarity, and cellular organization remain unclear. Here, we investigate the localization and function of INFLORESCENCE AND ROOT APICES RECEPTOR KINASE (IRK) in root development. We find that IRK-GFP localizes to the outer plasma membrane domain in endodermal cells but localizes to different domains in other cell types. Our results suggest that IRK localization is informed locally by adjacent cell types. irk mutants have excess cell divisions in the ground tissue stem cells and endodermis, indicating IRK functions to maintain tissue organization through inhibition of specific cell divisions. We predict that IRK perceives a directional cue that negatively regulates these cell divisions, thus linking intercellular signaling and cell polarity with the control of oriented cell divisions during development.
- Published
- 2019