A Conserved Molecular Framework for Compound Leaf Development
2008
Blein, Thomas, | Pulido, Amada | Vialette-Guiraud, Aurélie | Nikovics, Krisztina | Morin, Halima, | Hay, Angela, | Johansen, Ida Elisabeth | Tsiantis, Miltos, | Laufs, Patrick
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.
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