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Article Dans Une Revue The Plant cell Année : 2019

Divergent Functional Diversification Patterns in the SEP/AGL6/AP1 MADS-box Transcription Factor Superclade

Résumé

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. Here, we present a functional characterization of the seven SEP/AGL6 and four AP1/SQUA genes in the distant Asterid species Petunia x hybrida petunia. 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 PROTEIN 2 (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.
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Dates et versions

hal-02349131 , version 1 (05-11-2019)

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Patrice Morel, Pierre Chambrier, Véronique Boltz, Sophy Chamot, Frédérique Rozier, et al.. Divergent Functional Diversification Patterns in the SEP/AGL6/AP1 MADS-box Transcription Factor Superclade. The Plant cell, 2019, tpc.00162.2019. ⟨10.1105/tpc.19.00162⟩. ⟨hal-02349131⟩
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