Siriwardana Nirodhini S, Lamb Rebecca S
Plant Cellular and Molecular Biology Graduate Program, The Ohio State University, Columbus, OH 43210, USA.
Int J Dev Biol. 2012;56(4):207-21. doi: 10.1387/ijdb.113450ns.
For successful reproduction, angiosperms must form fertile flowers at the appropriate positions and at the appropriate times. The reproductive transition is especially important for monocarpic plants that only flower once. In the model annual plant Arabidopsis thaliana, this transition is controlled through regulation of a group of genes termed floral meristem identity genes, of which LEAFY (LFY) is arguably the most important. LFY orthologs are found throughout land plants and are essential for angiosperm reproduction. These genes have also been implicated in reproductive development in gymnosperms. LFY encodes a plant-specific transcription factor that can act as either an activator or repressor depending on context, including what co-factors it is interacting with. It controls multiple aspects of floral morphogenesis, including phyllotaxis, organ number, organ identity and determinacy. Much progress has been made in elucidating the molecular mechanisms through which LFY and its orthologs contribute to a precise switch to flowering. We discuss the current state of knowledge in Arabidopsis, with an emphasis on known target genes and co-factors of LFY.
为了成功繁殖，被子植物必须在适当的位置和适当的时间形成可育花朵。对于只开花一次的单性结实植物来说，生殖转变尤为重要。在模式一年生植物拟南芥中，这种转变是通过调控一组称为花分生组织特征基因的基因来控制的，其中LEAFY（LFY）可以说是最重要的。在整个陆地植物中都发现了LFY直系同源基因，它们对被子植物的繁殖至关重要。这些基因也与裸子植物的生殖发育有关。LFY编码一种植物特异性转录因子，根据具体情况，它既可以作为激活因子，也可以作为抑制因子，这包括它与哪些辅助因子相互作用。它控制着花形态发生的多个方面，包括叶序、器官数量、器官特征和确定性。在阐明LFY及其直系同源基因促成精确开花转变的分子机制方面已经取得了很大进展。我们讨论了拟南芥的当前知识状态，重点是LFY已知的靶基因和辅助因子。
