Nawy, T., Bayer, M., Mravec, J., Friml, J., Birnbaum, K. D., Lukowitz, W. (July 2010) The GATA factor HANABA TARANU is required to position the proembryo boundary in the early Arabidopsis embryo. Dev Cell, 19 (1). pp. 103-13. ISSN 1878-1551 (Electronic) 1534-5807 (Linking)
Abstract
Division of the Arabidopsis zygote defines two fundamentally different developmental domains, the proembryo and suspensor. The resulting boundary separates domain-specific gene expression, and a signal originating from the proembryo instructs the suspensor to generate the root stem cell niche. While root induction is known to require the phytohormone auxin and the Auxin Response Factor MONOPTEROS, it has remained largely elusive how the two domains involved in this process are initially specified. Here, we show that the GATA factor HANABA TARANU (HAN) is required to position the inductive proembryo boundary. Mutations in HAN cause a coordinated apical shift of gene expression patterns, revealing that HAN regulates transcription in the basal proembryo. Key auxin transporters are affected as early as the 8 cell stage, resulting in apical redistribution of auxin. Remarkably, han embryos eventually organize a root independent of MONOPTEROS and the suspensor around a new boundary marked by the auxin maximum.
| Item Type: | Paper |
|---|---|
| Subjects: | organism description > plant > Arabidopsis |
| CSHL Authors: | |
| Communities: | CSHL labs > Lukowitz lab |
| Depositing User: | CSHL Librarian |
| Date: | 20 July 2010 |
| Date Deposited: | 05 Oct 2011 14:44 |
| Last Modified: | 13 Mar 2018 13:24 |
| Related URLs: | |
| URI: | https://repository.cshl.edu/id/eprint/15495 |
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