Blein Thomas, Pulido Amada, Vialette-Guiraud Aurélie, Nikovics Krisztina, Morin Halima, Hay Angela, Johansen Ida Elisabeth, Tsiantis Miltos, Laufs Patrick
Laboratoire de Biologie Cellulaire, Institut Jean Pierre Bourgin, Institut National de la Recherche Agronomique (INRA), 78026 Versailles Cedex, France.
Science. 2008 Dec 19;322(5909):1835-9. doi: 10.1126/science.1166168.
Diversity in leaf shape is produced by alterations of the margin: for example, deep dissection leads to leaflet formation and less-pronounced incision results in serrations or lobes. By combining gene silencing and mutant analyses in four distantly related eudicot species, we show that reducing the function of NAM/CUC boundary genes (NO APICAL MERISTEM and CUP-SHAPED COTYLEDON) leads to a suppression of all marginal outgrowths and to fewer and fused leaflets. We propose that NAM/CUC genes promote formation of a boundary domain that delimits leaflets. This domain has a dual role promoting leaflet separation locally and leaflet formation at distance. In this manner, boundaries of compound leaves resemble boundaries functioning during animal development.
例如，深度分裂导致小叶形成，而不太明显的切口则导致锯齿或裂片。通过在四种远缘真双子叶植物中结合基因沉默和突变分析，我们发现降低NAM/CUC边界基因（无顶端分生组织和杯状子叶）的功能会导致所有边缘生长的抑制以及小叶数量减少和融合。我们提出，NAM/CUC基因促进界定小叶的边界域的形成。该域具有双重作用，在局部促进小叶分离并在远处促进小叶形成。通过这种方式，复叶的边界类似于动物发育过程中起作用的边界。
