Adriana Racolta and Anthony C. Bryan contributed equally to this work.
The receptor-like kinases GSO1 and GSO2 together regulate root growth in arabidopsis through control of cell division and cell fate specification
Article first published online: 13 NOV 2013
Copyright © 2013 Wiley Periodicals, Inc.
Volume 243, Issue 2, pages 257–278, February 2014
How to Cite
Racolta, A., Bryan, A. C. and Tax, F. E. (2014), The receptor-like kinases GSO1 and GSO2 together regulate root growth in arabidopsis through control of cell division and cell fate specification. Dev. Dyn., 243: 257–278. doi: 10.1002/dvdy.24066
- Issue published online: 21 JAN 2014
- Article first published online: 13 NOV 2013
- Accepted manuscript online: 3 OCT 2013 12:59PM EST
- Manuscript Revised: 19 SEP 2013
- Manuscript Accepted: 19 SEP 2013
- Manuscript Received: 4 AUG 2013
- NSF. Grant Numbers: MCB 0418946, IOS-0922678, IOS 1257316, IGERT DGEߚ0114420
- NIH. Grant Number: T32 GM08659
- receptor-like kinase;
- epidermal differentiation;
- root apical meristem;
- seedling development;
- sugar signaling;
- stem cells
Background: The root apical meristem of Arabidopsis is established post-embryonically as the main source of root cells, and its activity is maintained by complex bidirectional signaling between stem cells and mature cells. The receptor-like kinases GASSHO1 (GSO1) and GSO2 have been shown to regulate aerial epidermal function and seedling growth in Arabidopsis. Results: Here we show that gso1; gso2 seedlings also have root growth and patterning defects. Analyses of mutant root morphology indicate abnormal numbers of cells in longitudinal files and radial cell layers, as well as aberrant stem cell division planes. gso1; gso2 double mutants misexpress markers for stem cells and differentiated root cell types. In addition, gso1; gso2 root growth defects, but not marker missexpression or patterning phenotypes, are rescued by growth on media containing metabolizable sugars. Conclusions: We conclude that GSO1 and GSO2 function together in intercellular signaling to positively regulate cell proliferation, differentiation of root cell types, and stem cell identity. In addition, GSO1 and GSO2 control seedling root growth by modulating sucrose response after germination. Developmental Dynamics 243:257–278, 2014. © 2013 Wiley Periodicals, Inc.