An evolutionarily conserved mechanism delimiting SHR movement defines a single layer of endodermis in plants.

Journal Article (Journal Article)

Intercellular protein movement plays a critical role in animal and plant development. SHORTROOT (SHR) is a moving transcription factor essential for endodermis specification in the Arabidopsis root. Unlike diffusible animal morphogens, which form a gradient across multiple cell layers, SHR movement is limited to essentially one cell layer. However, the molecular mechanism is unknown. We show that SCARECROW (SCR) blocks SHR movement by sequestering it into the nucleus through protein-protein interaction and a safeguard mechanism that relies on a SHR/SCR-dependent positive feedback loop for SCR transcription. Our studies with SHR and SCR homologs from rice suggest that this mechanism is evolutionarily conserved, providing a plausible explanation why nearly all plants have a single layer of endodermis.

Full Text

Duke Authors

Cited Authors

  • Cui, H; Levesque, MP; Vernoux, T; Jung, JW; Paquette, AJ; Gallagher, KL; Wang, JY; Blilou, I; Scheres, B; Benfey, PN

Published Date

  • April 2007

Published In

Volume / Issue

  • 316 / 5823

Start / End Page

  • 421 - 425

PubMed ID

  • 17446396

Electronic International Standard Serial Number (EISSN)

  • 1095-9203

International Standard Serial Number (ISSN)

  • 0036-8075

Digital Object Identifier (DOI)

  • 10.1126/science.1139531


  • eng