The FUS3 transcription factor functions through the epidermal regulator TTG1 during embryogenesis in Arabidopsis
Article first published online: 17 NOV 2003
The Plant Journal
Volume 37, Issue 1, pages 73–81, January 2004
How to Cite
Tsuchiya, Y., Nambara, E., Naito, S. and McCourt, P. (2004), The FUS3 transcription factor functions through the epidermal regulator TTG1 during embryogenesis in Arabidopsis. The Plant Journal, 37: 73–81. doi: 10.1046/j.1365-313X.2003.01939.x
- Issue published online: 17 NOV 2003
- Article first published online: 17 NOV 2003
- Received 14 July 2003; revised 16 September 2003; accepted 26 September 2003.
- plant development;
- late embryogenesis;
- leafy cotyledons
Loss-of-function mutations in the FUSCA3 (FUS3) gene of Arabidopsis result in alterations in cotyledon identity, inability to complete late seed maturation processes, and the premature activation of apical and root embryonic meristems, which indicates that this transcription factor is an essential regulator of embryogenesis. Although FUS3 shows a complex pattern of expression in the embryo, this gene is only required in the protoderm to carry out its functions. Moreover, the epidermal morphogenesis regulator TRANSPARENT TESTA GLABRA1 (TTG1) is negatively regulated by FUS3 in the embryo. When a loss-of-function ttg1 mutation is introduced into a fus3 mutant, a number of fus3-related phenotypes are rescued, indicating a functional TTG1 gene is required to manifest the fus3 mutant phenotype. It therefore appears that one of the functions of FUS3 is to restrict the domain of expression of TTG1 during embryogenesis. The FUS3–TTG1 interaction is both maternal and zygotic, suggesting a complex relationship is required between these gene products to allow correct seed development.