Divergent Functional Diversification Patterns in the SEP/AGL6/AP1 MADS-Box Transcription Factor Superclade.,The Plant Cell

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Divergent Functional Diversification Patterns in the SEP/AGL6/AP1 MADS-Box Transcription Factor Superclade.
The Plant Cell ( IF 10.0 ) Pub Date : 2019-10-07 , DOI: 10.1105/tpc.19.00162
Patrice Morel ₁ , Pierre Chambrier ₁ , Véronique Boltz ₁ , Sophy Chamot ₁ , Frédérique Rozier ₁ , Suzanne Rodrigues Bento ₁ , Christophe Trehin ₁ , Marie Monniaux ₁ , Jan Zethof ₂ , Michiel Vandenbussche ₃

Affiliation

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.plantcell;31/12/3033/FX1F1fx1.

中文翻译：

SEP/AGL6/AP1 MADS-Box 转录因子超进化枝中不同的功能多样化模式。

SEPALLATA (SEP) 和 APETALA1 (AP1)/SQUAMOSA (SQUA) MADS-box 转录因子亚家族的成员在拟南芥 (Arabidopsis thaliana) 的花器官同一性确定和花分生组织决定中发挥着关键作用。在这里，我们展示了遥远的紫苑物种矮牵牛（矮牵牛×杂交）中七个 SEP/AGL6 和四个 AP1/SQUA 基因的功能特征。基于对单突变体和高阶突变体的分析，我们报告矮牵牛 SEP1/SEP2/SEP3 直向同源物与 AGL6 一起编码经典的 SEP 花器官身份和花终止功能，其中矮牵牛 SEP3 直向同源物 FLORAL BINDING PROTEIN2 (FBP2) 起主导作用。）。相比之下，FBP9 亚支成员 FBP9 和 FBP23 在拟南芥中不存在明确的直系同源物，它们与 FBP4 一起在确定花分生组织同一性方面发挥着重要作用，而对花器官同一性仅做出中等贡献。反过来，矮牵牛 AP1/SQUA 亚科的四个成员对于花序分生组织身份是多余的，并且与 BEN/ROB 基因一起在第一花轮中充当 B 功能抑制子。总体而言，这些数据与其他物种的研究一起表明，在被子植物进化过程中，SEP/AGL6 和 AP1/SQUA MADS-box 亚家族的功能多样化存在重大差异。plantcell;31/12/3033/FX1F1fx1。

更新日期：2019-12-11

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