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Translating Ribosome Affinity Purification TRAP to Investigate Arabidopsis thaliana Root Development at a Cell Type-Specific Scale
Published on: May 14, 2020
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Intercellular movement of the putative transcription factor SHR in root patterning.
1Department of Biology, New York University, New York, New York 10003, USA.
Nature
|September 21, 2001
Summary
The short-root (SHR) protein moves from stele cells to adjacent cells, regulating plant root development. This signaling is crucial for cell division and specifying endodermal cell fate in Arabidopsis.
Area of Science:
- Plant biology
- Developmental biology
- Genetics
Background:
- Plant development relies on positional information, but signaling mechanisms are poorly understood.
- The Arabidopsis root radial pattern forms via cell division and fate acquisition.
- short-root (shr) mutants exhibit defects in cortex/endodermis development and endodermis specification.
Purpose of the Study:
- To investigate the role of the short-root (SHR) gene and its protein product in Arabidopsis root development.
- To elucidate the signaling mechanism underlying cell fate determination in plant roots.
Main Methods:
- Analysis of shr mutants to observe developmental defects.
- Localization studies of SHR mRNA and protein.
- Ectopic expression experiments using the SCARECROW (SCR) promoter.
Main Results:
- SHR protein moves non-cell-autonomously from stele cells to adjacent cells, entering the nucleus.
- Ectopic SHR expression leads to autocatalytic signaling, altered cell fates, and increased cell layers.
- SHR is essential for endodermis specification and cortex/endodermis initial daughter cell division.
Conclusions:
- SHR protein acts as a mobile signal originating from the stele.
- SHR is a key regulator activating endodermal cell fate and SCR-mediated cell division.
- A model is proposed where SHR functions both as a signal and an inducer of developmental pathways.
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