Divergent Functional Diversification Patterns in the SEP/AGL6/AP1 MADS-box Transcription Factor Superclade
2019
Morel, Patrice | Chambrier, Pierre | Boltz, Véronique | Chamot, Sophy | Rozier, Frédérique | Rodrigues Bento, Suzanne | Trehin, Christophe | Monniaux, Marie | Zethof, Jan | Vandenbussche, Michiel | Reproduction et développement des plantes (RDP) ; École normale supérieure de Lyon (ENS de Lyon) ; Université de Lyon-Université de Lyon-Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Centre National de la Recherche Scientifique (CNRS) | Dept Comparat Dev & Genet ; Max Planck Institute for Plant Breeding Research (MPIPZ) | Institute for Water and Wetland Research ; Radboud University [Nijmegen] | ANR-16-CE20-0024,ROSASCENT,Biosynthèse des terpènes du parfum chez la rose(2016)
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Show more [+] Less [-]English. Members of SEPALLATA (SEP) and APETALA1 (AP1)/SQUAMOSA (SQUA) MADS-box transcriptionfactor subfamilies play key roles in floral organ identity determination and floral meristem determinacyin the Rosid species Arabidopsis. Here, we present a functional characterization of the seven SEP/AGL6and four AP1/SQUA genes in the distant Asterid species Petunia x hybrida petunia. Based on the analysisof single and higher order mutants, we report that the petunia SEP1/SEP2/SEP3 orthologs together withAGL6 encode classical SEP floral organ identity and floral termination functions, with a master role forthe petunia SEP3 ortholog FLORAL BINDING PROTEIN 2 (FBP2). By contrast, the FBP9 subclademembers FBP9 and FBP23, for which no clear ortholog is present in Arabidopsis, play a major role indetermining floral meristem identity together with FBP4, while contributing only moderately to floralorgan identity. In turn, the four members of the petunia AP1/SQUA subfamily redundantly are requiredfor inflorescence meristem identity, and act as B-function repressors in the first floral whorl, togetherwith BEN/ROB genes. Overall, these data together with studies in other species suggest majordifferences in the functional diversification of the SEP/AGL6 and AP1/SQUA MADS-box subfamiliesduring angiosperm evolution.
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