植物通过控制细胞分裂和伸长决定器官的形状。为了研究器官形状决定的分子机理, 通过EMS诱变分离得到一个叶形细长的拟南芥突变体。细胞生物学观察发现, 该基因突变不仅影响了生长点中的细胞分裂, 也影响了叶片细胞的形状和数目, 其表皮细胞凸起数明显减少, 呈单轴向伸长, 因此将该突变体定名为slender leaves and cells (slc)。有趣的是, 不同组织内细胞分裂和伸长受到不同程度的影响, 说明SLC基因在协调细胞分裂和伸长过程中起关键作用。图位克隆结果表明, SLC与小RNA介导的基因沉默相关基因AGO1等位, 其第574位组氨酸突变为酪氨酸。slc和ago1杂交F1代植物呈现突变体表型, 证明AGO1和SLC确实为同一基因。以上结果表明, SLC/AGO1所介导的转录后基因沉默对控制植物器官和细胞形状决定均起重要作用。
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