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首页> 外文期刊>Journal of Experimental Botany >The rice StMADS11-like genes OsMADS22 and OsMADS47 cause floral reversions in Arabidopsis without complementing the svp and agl24 mutants
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The rice StMADS11-like genes OsMADS22 and OsMADS47 cause floral reversions in Arabidopsis without complementing the svp and agl24 mutants

机译：水稻StMADS11样基因OsMADS22和OsMADS47导致拟南芥中的花序逆转而不补充svp和agl24突变体

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摘要

During floral induction and flower development plants undergo delicate phase changes which are under tight molecular control. MADS-box transcription factors have been shown to play pivotal roles during these transition phases. SHORT VEGETATIVE PHASE (SVP) and AGAMOUS LIKE 24 (AGL24) are important regulators both during the transition to flowering and during flower development. During vegetative growth they exert opposite roles on floral transition, acting as repressor and promoter of flowering, respectively. Later during flower development they act redundantly as negative regulators of AG expression. In rice, the orthologues of SVP and AGL24 are OsMADS22, OsMADS47, and OsMADS55 and these three genes are involved in the negative regulation of brassinosteroid responses. In order to understand whether these rice genes have maintained the ability to function as regulators of flowering time in Arabidopsis, complementation tests were performed by expressing OsMADS22 and OsMADS47 in the svp and agl24 mutants. The results show that the rice genes are not able to complement the flowering-time phenotype of the Arabidopsis mutants, indicating that they are biologically inactive in Arabidopsis. Nevertheless, they cause floral reversions, which mimic the SVP and AGL24 floral overexpressor phenotypes. Yeast two-hybrid analysis suggests that these floral phenotypes are probably the consequence of protein interactions between OsMADS22 and OsMADS47 and other MADS-box proteins which interfere with the formation of complexes required for normal flower development.
机译：在花的诱导和花的发育过程中，植物会经历微妙的相变，并受到严格的分子控制。在这些过渡阶段，MADS-box转录因子已显示出举足轻重的作用。短生植物阶段（SVP）和AGAMOUS LIKE 24（AGL24）在过渡到开花和花朵发育期间都是重要的调节剂。在营养生长期间，它们在花期转换中发挥相反的作用，分别充当开花的阻遏物和促进剂。在花朵发育的后期，它们多余地充当AG表达的负调控因子。在水稻中，SVP和AGL24的直向同源物是OsMADS22，OsMADS47和OsMADS55，这三个基因与油菜素甾体应答的负调控有关。为了了解这些水稻基因是否保持了拟南芥中开花时间调节剂的功能，通过在svp和agl24突变体中表达OsMADS22和OsMADS47进行了互补试验。结果表明，水稻基因不能与拟南芥突变体的开花时间表型互补，表明它们在拟南芥中没有生物学活性。但是，它们会导致花型逆转，从而模仿SVP和AGL24花型过表达表型。酵母两杂交分析表明，这些花卉表型可能是OsMADS22和OsMADS47与其他MADS-box蛋白之间蛋白质相互作用的结果，这些相互作用会干扰正常花发育所需的复合物的形成。

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