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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >ORGAN B0UNDARY1 defines a gene expressed at the junction between the shoot apical meristem and lateral organs
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ORGAN B0UNDARY1 defines a gene expressed at the junction between the shoot apical meristem and lateral organs

机译：ORGAN B0UNDARY1定义了一个在茎尖分生组织和侧器官之间的交界处表达的基因

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摘要

We identify a gene, ORGAN BOUNDARY1 (OBO1), by its unique pattern of enhancer- driven GFP expression at the boundaries between the apical meristems and lateral organs in Arabidopsis embryos, seedlings, and mature plants. OBO1 also is expressed at the root apical meristem and in distinct cell files surrounding this area. OBO1 is one of a 10-member plant-specific gene family encoding a single small domain (133 amino acids) with unknown function. One member of this gene family,OBO2. is identical to a previously studied gene, LIGHT-SENSITIVE HYPOCOTYL1. Overexpression of OBO1 causes an abnormal number and size of petals and petal-stamen fusions. The patterns of OBO1 gene expression are distinct but overlap with other genes involved in boundary formation in the Arabidopsis shoot apical meristem, including CUP-SHAPED COTYLEDON, LATERAL ORGAN BOUNDARIES, BLADE-ON-PETIOLE, ASYMMETRIC LEAVES, and LATERAL ORGAN FUSION. Nuclear localization of OBO1 suggests that it might act with one or more of the transcription factors encoded by the foregoing genes. Ablation of the specific cells expressing OBO1 leads to loss of the shoot apical meristem and lateral organs. Thus, the cells expressing OBO1 are important for meristem maintenance and organogenesis in Arabidopsis.
机译：我们通过其独特的增强子驱动的GFP在拟南芥胚胎，幼苗和成熟植物的顶端分生组织和侧器官之间的边界表达GFP的表达模式，确定了一个基因ORGAN BOUNDARY1（OBO1）。 OBO1也在根尖分生组织和该区域周围的不同细胞文件中表达。 OBO1是由10个成员组成的植物特异性基因家族之一，其编码具有未知功能的单个小域（133个氨基酸）。该基因家族的一个成员，OBO2。与先前研究的光敏感HYPOCOTYL1基因相同。 OBO1的过度表达会导致花瓣和花瓣-雄蕊融合体的数量和大小异常。 OBO1基因表达的模式是独特的，但与拟南芥芽顶端分生组织中参与边界形成的其他基因重叠，包括杯形子叶，侧生器官边界，叶柄上的叶片，不对称叶和侧生器官融合。 OBO1的核定位表明它可能与上述基因编码的一种或多种转录因子起作用。表达OBO1的特定细胞的消融导致茎尖分生组织和侧器官的丧失。因此，表达OBO1的细胞对于拟南芥的分生组织维持和器官发生很重要。

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