Auxin patterns Solanum lycopersicum leaf morphogenesis
Auxin patterns Solanum lycopersicum leaf morphogenesis
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DOI：
10.1242/dev.033811
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发表时间：
2009-09-01
期刊：
影响因子：
4.6
通讯作者：
Sinha, Neelima
中科院分区：
文献类型：
--
作者：
Koenig, Daniel;Bayer, Emmanuelle;Sinha, Neelima
植物多样性最引人注目的方面之一是叶片形状的变化。这种多样性很大程度上是通过调节叶片解剖形成裂片或小叶来实现的。在这里，我们表明，植物激素生长素是一个关键的信号，调节分裂的生长发育所需的解剖叶片。在叶片发育过程中，生长素的不对称分布在主动运输的驱动下，描述了裂片和小叶的起始，并规定了不同的片状生长。此外，AUX/吲哚-3-乙酸(IAA)基因家族的同源成员通过在单叶和复叶发育过程中抑制生长素低浓度区域的生长来调节生长素在决定叶片形状中的作用。这些结果提供了分子证据，表明小叶的起始过程类似于地上部顶端分生组织的器官发生，但复合和单叶通过进化保守的机制调节边缘生长，从而揭示了复合和单叶的同源性。
One of the most striking aspects of plant diversity is variation in leaf shape. Much of this diversity is achieved by the modulation of leaf blade dissection to form lobes or leaflets. Here, we show that the phytohormone auxin is a crucial signal regulating the partitioned outgrowth necessary to develop a dissected leaf. In developing leaves, the asymmetric distribution of auxin, driven by active transport, delineates the initiation of lobes and leaflets and specifies differential laminar outgrowth. Furthermore, homologous members of the AUX/indole-3-acetic acid (IAA) gene family mediate the action of auxin in determining leaf shape by repressing outgrowth in areas of low auxin concentration during both simple and compound leaf development. These results provide molecular evidence that leaflets initiate in a process reminiscent of organogenesis at the shoot apical meristem, but that compound and simple leaves regulate marginal growth through an evolutionarily conserved mechanism, thus shedding light on the homology of compound and simple leaves.