Present address: Research Institute for Bioresources, Okayama University, Kurashiki 710-0046, Japan.
Rice ABERRANT PANICLE ORGANIZATION 1, encoding an F-box protein, regulates meristem fate
Article first published online: 30 JUL 2007
The Plant Journal
Volume 51, Issue 6, pages 1030–1040, September 2007
How to Cite
Ikeda, K., Ito, M., Nagasawa, N., Kyozuka, J. and Nagato, Y. (2007), Rice ABERRANT PANICLE ORGANIZATION 1, encoding an F-box protein, regulates meristem fate. The Plant Journal, 51: 1030–1040. doi: 10.1111/j.1365-313X.2007.03200.x
- Issue published online: 7 AUG 2007
- Article first published online: 30 JUL 2007
- Received 13 February 2007; revised 18 May 2007; accepted 18 May 2007.
- ABERRANT PANICLE ORGANIZATION 1;
- floral organ identity;
- F-box protein;
- UNUSUAL FLORAL ORGAN
Inflorescence architecture is one of the most important agronomical traits. Characterization of rice aberrant panicle organization 1 (apo1) mutants revealed that APO1 positively controls spikelet number by suppressing the precocious conversion of inflorescence meristems to spikelet meristems. In addition, APO1 is associated with the regulation of the plastchron, floral organ identity, and floral determinacy. Phenotypic analyses of apo1 and floral homeotic double mutants demonstrate that APO1 positively regulates class-C floral homeotic genes, but not class-B genes. Molecular studies revealed that APO1 encodes an F-box protein, an ortholog of Arabidopsis UNUSUAL FLORAL ORGAN (UFO), which is a positive regulator of class-B genes. Overexpression of APO1 caused an increase in inflorescence branches and spikelets. As the mutant inflorescences and flowers differed considerably between apo1 and ufo, the functions of APO1 and UFO appear to have diverged during evolution.