Patterning of inflorescences and flowers by the F-Box protein DOUBLE TOP and the LEAFY homolog ABERRANT LEAF AND FLOWER of petunia.

The Plant Cell
Erik SouerRonald Koes

Abstract

Angiosperms display a wide variety of inflorescence architectures differing in the positions where flowers or branches arise. The expression of floral meristem identity (FMI) genes determines when and where flowers are formed. In Arabidopsis thaliana, this is regulated via transcription of LEAFY (LFY), which encodes a transcription factor that promotes FMI. We found that this is regulated in petunia (Petunia hybrida) via transcription of a distinct gene, DOUBLE TOP (DOT), a homolog of UNUSUAL FLORAL ORGANS (UFO) from Arabidopsis. Mutation of DOT or its tomato (Solanum lycopersicum) homolog ANANTHA abolishes FMI. Ubiquitous expression of DOT or UFO in petunia causes very early flowering and transforms the inflorescence into a solitary flower and leaves into petals. Ectopic expression of DOT or UFO together with LFY or its homolog ABERRANT LEAF AND FLOWER (ALF) in petunia seedlings activates genes required for identity or outgrowth of organ primordia. DOT interacts physically with ALF, suggesting that it activates ALF by a posttranslational mechanism. Our findings suggest a wider role than previously thought for DOT and UFO in the patterning of flowers and indicate that the different roles of LFY and UFO homologs in the spatiotem...Continue Reading

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Citations

Feb 3, 2011·Planta·Rotem NetaRina Kamenetsky
Aug 13, 2013·Trends in Plant Science·Francesca M QuattrocchioRonald Koes
Nov 13, 2012·Nature Genetics·Cora A MacAlisterZachary B Lippman
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Mar 24, 2010·Journal of Experimental Botany·Rob CastelRonald Koes
Mar 24, 2012·Journal of Experimental Botany·Adriana Garay-ArroyoElena R Álvarez-Buylla
Apr 20, 2013·Journal of Experimental Botany·Nathalie VerhoefErik Souer
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Mar 22, 2014·Journal of Experimental Botany·Serena Della PinaRonald Koes
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