Topic
Root radial pattern formation
About: Root radial pattern formation is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 42 citations.
Papers
TL;DR: It is proposed that highly symmetric root ground tissue patterns are maintained by the actions of two independent pathways, one using post-transcriptional regulation mediated by AGO1 and the other using the SHR/SCR transcriptional regulator.
Abstract: The formation of radially symmetric tissue patterns is one of the most basic processes in the development of vascular plants. In Arabidopsis thaliana, plant-specific GRAS-type transcription factors, SHORT-ROOT (SHR) and SCARECROW (SCR), are required for asymmetric cell divisions that separate two ground tissue cell layers, the endodermis and cortex, as well as for endodermal cell fate specification. While loss of SHR or SCR results in a single-layered ground tissue, radially symmetric cellular patterns are still maintained, suggesting that unknown regulatory mechanisms act independently of the SHR/SCR-dependent pathway. In this study, we identified a novel root radial pattern mutant and found that it is a new argonaute1 (ago1) allele. Multiple ago1 mutant alleles contained supernumerary ground tissue cell layers lacking a concentric organization, while expression patterns of SHR and SCR were not affected, revealing a previously unreported role for AGO1 in root ground tissue patterning. Analyses of ago1 scr double mutants demonstrated that the simultaneous loss of the two pathways caused a dramatic reduction in cellular organization and ground tissue identity as compared with the single mutants. Based on these results, we propose that highly symmetric root ground tissue patterns are maintained by the actions of two independent pathways, one using post-transcriptional regulation mediated by AGO1 and the other using the SHR/SCR transcriptional regulator.
40 citations
Patent•
24 May 2001TL;DR: The SHR gene is expressed specifically in root and hypocotyl progenitor tissues of embryos, and in roots and stems as mentioned in this paper, and is expressed in tissues internal to the endodermis, namely, the pericycle, phloem, protoxylem and procambium.
Abstract: The invention provides the SHORT-ROOT (SHR) gene (which encompasses the Arabidopsis SHR gene and its orthologs and paralogs), isolated nucleic acids of SHORT-ROOT(SHR), including, but not limited, to coding sequences, promoters and regulatory regions of SHR. The invention further provides gene products of SHR, including, but not limited to, transcriptional products such as mRNAs, antisense, and ribozyme molecules, and translational products such as the SHR protein, polylpeptides, peptides and fusion proteins related thereto. The invention also provides antibodies to SHR gene products, and the use of the foregoing to improve agronomically valuable plants. The SHR gene is expressed specifically in root and hypocotyl progenitor tissues of embryos, and in roots and stems. More specifically, SHR is expressed in tissues internal to the endodermis, namely, the pericycle, phloem, protoxylem and procambium. SHR expression controls cell division of certain cell types in roots, affects the organization of root and stem, and affects gravitropism of aerial structures. SHR functions as a positional signal in root radial pattern formation through spatially restricted intercellular movement.
10 citations
Performance Metrics
| Year | Papers |
|---|---|
| 2009 | 1 |
| 2001 | 1 |