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作者信息
Mello Alison, Efroni Idan, Rahni Ramin, Birnbaum Kenneth D
机构信息
Center for Genomics and Systems Biology, Department of Biology, New York University, 12 Waverly Place, New York, NY, 10003, USA.
The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University, PO Box 12, Rehovot, 76100, Israel.
出版信息
New Phytol. 2018 Dec 11. doi: 10.1111/nph.15630.
The genus Selaginella resides in an early branch of the land plant lineage that possesses a vasculature and roots. The majority of the Selaginella root system is shoot borne and emerges through a distinctive structure known as the rhizophore, the organ identity of which has been a long-debated question. The rhizophore of Selaginella moellendorffii - a model for the lycophytes - shows plasticity to develop into a root or shoot up until 8 d after angle meristem emergence, after which it is committed to root fate. We subsequently use morphology and plasticity to define the stage of rhizophore identity. Transcriptomic analysis of the rhizophore during its plastic stage reveals that, despite some resemblance to the root meristem, rhizophore gene expression patterns are largely distinct from both shoot and root meristems. Based on this transcriptomic analysis and on historical anatomical work, we conclude that the rhizophore is a distinct organ with unique features.
卷柏属植物位于陆地植物谱系的早期分支中，该谱系具有维管系统和根。卷柏的大部分根系由茎产生，并通过一种独特的结构——根托长出，根托的器官特性一直是一个长期争论的问题。作为石松类植物模型的江南卷柏的根托，在角分生组织出现后直到8天，都表现出发育成根或茎的可塑性，之后则确定为根的命运。我们随后利用形态学和可塑性来定义根托特性的阶段。对处于可塑性阶段的根托进行转录组分析发现，尽管与根分生组织有一些相似之处，但根托的基因表达模式在很大程度上与茎和根的分生组织都不同。基于这种转录组分析和以往的解剖学研究，我们得出结论，根托是一种具有独特特征的独特器官。
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