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Koo, Sung C.,Bracko, Oliver,Park, Mi S.,Schwab, Rebecca,Chun, Hyun J.,Park, Kyoung M.,Seo, Jun S.,Grbic, Vojislava,Balasubramanian, Sureshkumar,Schmid, Markus,Godard, Franç,ois,Yun, Dae-Jin,Lee, Blackwell Publishing Ltd 2010 The Plant journal Vol.62 No.5
<P>Summary</P><P>MADS-domain transcription factors play pivotal roles in various developmental processes. The lack of simple loss-of-function phenotypes provides impediments to understand the biological function of some of the MADS-box transcription factors. Here we have characterized the potential role of the <I>Arabidopsis thaliana AGAMOUS-LIKE6</I> (<I>AGL6</I>) gene by fusing full-length coding sequence with transcriptional activator and repressor domains and suggest a role for <I>AGL6</I> in lateral organ development and flowering. Upon photoperiodic induction of flowering, <I>AGL6</I> becomes expressed in abaxial and proximal regions of cauline leaf primordia, as well as the cryptic bracts subtending flowers. In developing flowers, <I>AGL6</I> is detected in the proximal regions of all floral organs and in developing ovules. Converting <I>AGL6</I> into a strong activator through fusion to the VP16 domain triggers bract outgrowth, implicating <I>AGL6</I> in the development of bractless flowers in Arabidopsis<I>.</I> In addition, ectopic reproductive structures form on both bracts and flowers in <I>gAGL6::VP16</I> transgenic plants, which is dependent on B and C class homeotic genes, but independent of <I>LEAFY.</I> Overexpression of both <I>AGL6</I> and its transcriptional repressor form, <I>AGL6::EAR</I>, causes precocious flowering and terminal flower formation, suggesting that <I>AGL6</I> suppresses the function of a floral repressor.</P>
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