Journal Article

Partial Conservation of <i>LFY</i> Function between Rice and <i>Arabidopsis</i>

Atsushi Chujo, Ze Zhang, Hirohisa Kishino, Ko Shimamoto and Junko Kyozuka

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 12, pages 1311-1319
Published in print December 2003 | ISSN: 0032-0781
Published online December 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg155
Partial Conservation of LFY Function between Rice and Arabidopsis

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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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.

Keywords: Keywords: Divergence — Flower development — Grass species — LFY/FLO — Phylogeny — RFL.

Journal Article.  5868 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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