Characterisation of three shoot apical meristem mutants of Arabidopsis thaliana
Characterisation of three shoot apical meristem mutants of Arabidopsis thaliana
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作者：
H. Leyser;I. Furner
双子叶植物茎尖分生组织在结构和功能上都受到高度调控，但其调控机制尚不清楚。在这里，我们描述了遗传和表型特征的隐性突变在三个位点的拟南芥分生组织的结构和功能被破坏。这些基因座是Clavata1（Clv1）、Fasciata1（Fas1）和Fasciata2（Fas2）。在这些基因座突变的植物是扁化的，具有宽而平的茎和破坏的叶序。在所有的情况下，扁化与茎顶端分生组织扩大和改变花的发育。虽然所有的突变体都有一些共同的表型特征，但它们可以分为两类。多效性的fas1和fas2突变体不能启动野生型器官，在分生组织结构中显示出重大改变，并且具有降低的根生长。与此相反，clv1突变体植物表现出接近野生型的器官表型，茎顶端分生组织结构和野生型根生长的更微妙的变化。
The shoot apical meristem of dicotyledonous plants is highly regulated both structurally and functionally, but little is known about the mechanisms involved in this regulation. Here we describe the genetic and phenotypic characterisation of recessive mutations at three loci of Arabidopsis thaliana in which meristem structure and function are disrupted. The loci are Clavata1 (Clv1), Fasciata1 (Fas1) and Fasciata2 (Fas2). Plants mutant at these loci are fasciated having broad, flat stems and disrupted phyllotaxy. In all cases, the fasciations are associated with shoot apical meristem enlargement and altered floral development. While all the mutants share some phenotypic features they can be divided into two classes. The pleiotropic fas1 and fas2 mutants are unable to initiate wild- type organs, show major alterations in meristem structure and have reduced root growth. In contrast, clv1 mutant plants show near wild-type organ phenotypes, more subtle changes in shoot apical meristem structure and wild-type root growth.