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Plant and Cell Physiology, 2003, Vol. 44, No. 12 1311-1319
© 2003 Oxford University Press

Partial Conservation of LFY Function between Rice and Arabidopsis

Atsushi Chujo1, Ze Zhang1,4, Hirohisa Kishino1, Ko Shimamoto2 and Junko Kyozuka1,3,5

1 Graduate School of Agriculture and Life Science, The University of Tokyo, 1-1-1, Yayoi, Bunkyo, Tokyo, 113-8657 Japan
2 Department of Bio-Science, Nara Institute of Science and Technology, 8916-5, Takayama, Ikoma, Nara, 630-0101 Japan
3 Core Research of Science and Technology (CREST), Japan Science and Technology Corporation (JST), 4-1-8, Honcho, Kawaguchi, Saitama, 332-0012 Japan
4 Institute for Bioinformatics Research and Development (BIRD), Japan Science and Technology Corporation (JST), 4-1-8, Honcho, Kawaguchi, Saitama, 332-0012 Japan

The LFY/FLO genes encode plant-specific transcription factors and play major roles in the reproductive transition as well as floral development. In this study, we reconstructed the phylogenetic tree of the 49 LFY/FLO homologs from various plant species. The tree clearly shows that the LFY/FLO genes from the eudicots and monocots formed the two monophyletic clusters with very high bootstrap probabilities, respectively. Furthermore, grass LFY/FLO genes have experienced significant acceleration of amino acid replacement rate compared with the eudicot homolog. To test whether grass LFY/FLO genes have a conserved function with those of eudicots, we introduced RFL, a rice LFY homolog, into the Arabidopsis lfy mutant. The RFL gene driven by LFY promoter partially rescued the lfy mutation, suggesting that the functions of LFY and RFL partly overlap. Interestingly, the RFL but not LFY, strongly activated the expression of AP1 and AG, the downstream targets of LFY, even in the vegetative tissues. The LFY::RFL transgenic Arabidopsis plants exhibited abnormal patterns of development such as leaf curling, bushy appearance and the transformation of ovules into carpels. All of the results indicate that both the partial conservation and divergence of LFY function between rice and Arabidopsis.

5 Corresponding author: E-mail, akyozuka{at}mail.ecc.u-tokyo.ac.jp.


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