Abstract：
Gametogenesis, which is essential to the sexual reproductive system, has drastically changed during plant evolution. Bryophytes, lycophytes and ferns develop reproductive organs called gametangia-antheridia and archegonia for sperm and egg production, respectively. However, the molecular mechanism of early gametangium development remains unclear. Here we identified a \'non-canonical\' type of BZR/BES transcription factor, MpBZR3, as a regulator of gametangium development in a model bryophyte, Marchantia polymorpha. Interestingly, overexpression of MpBZR3 induced ectopic gametangia. Genetic analysis revealed that MpBZR3 promotes the early phase of antheridium development in male plants. By contrast, MpBZR3 is required for the late phase of archegonium development in female plants. We demonstrate that MpBZR3 is necessary for the successful development of both antheridia and archegonia but functions in a different manner between the two sexes. Together, the functional specialization of this \'non-canonical\' type of BZR/BES member may have contributed to the evolution of reproductive systems.
摘要：
配子发生,这对于性生殖系统至关重要，在植物进化过程中发生了巨大的变化。苔藓植物,lycophytes和蕨类植物发展生殖器官称为配子囊-antheridia和archegonia精子和卵子生产，分别。然而,早期配子体发育的分子机制尚不清楚。在这里，我们确定了一种“非规范”类型的BZR/BES转录因子，MpBZR3，作为模型苔藓植物中配子体发育的调节剂，Marchantiapolymora.有趣的是,MpBZR3过表达诱导异位配子。遗传分析显示，MpBZR3促进雄性植物中花药发育的早期阶段。相比之下,MpBZR3是雌性植物中古生菌发育后期所必需的。我们证明，MpBZR3对于成功发展无花症和弓形虫都是必需的，但在两性之间的作用方式不同。一起,这种“非规范”类型的BZR/BES成员的功能专业化可能有助于生殖系统的进化。
