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- Title
Divergent Functional Diversification Patterns in the SEP/AGL6/AP1 MADS-Box Transcription Factor Superclade.
- Authors
Morel, Patrice; Chambrier, Pierre; Boltz, Véronique; Chamot, Sophy; Rozier, Frédérique; Bento, Suzanne Rodrigues; Trehin, Christophe; Monniaux, Marie; Zethof, Jan; 1, Michiel Vandenbussche
- Abstract
Members of SEPALLATA (SEP) and APETALA1 (AP1)/ SQUAMOSA (SQUA) MADS-box transcription factor subfamilies play key roles in floral organ identity determination and floral meristem determinacy in the rosid species Arabidopsis (Arabidopsis thaliana). Here, we present a functional characterization of the seven SEP / AGL6 and four AP1 / SQUA genes in the distant asterid species petunia (Petunia × hybrida). Based on the analysis of single and higher order mutants, we report that the petunia SEP1 / SEP2 / SEP3 orthologs together with AGL6 encode classical SEP floral organ identity and floral termination functions, with a master role for the petunia SEP3 ortholog FLORAL BINDING PROTEIN2 (FBP2). By contrast, the FBP9 subclade members FBP9 and FBP23 , for which no clear ortholog is present in Arabidopsis, play a major role in determining floral meristem identity together with FBP4 , while contributing only moderately to floral organ identity. In turn, the four members of the petunia AP1 / SQUA subfamily redundantly are required for inflorescence meristem identity and act as B-function repressors in the first floral whorl, together with BEN / ROB genes. Overall, these data together with studies in other species suggest major differences in the functional diversification of the SEP / AGL6 and AP1 / SQUA MADS-box subfamilies during angiosperm evolution. Open in new tab Download slide Open in new tab Download slide
- Publication
Plant Cell, 2019, Vol 31, Issue 12, p3033
- ISSN
1040-4651
- Publication type
Article
- DOI
10.1105/tpc.19.00162