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Science 20 January 2006:
Vol. 311. no. 5759, pp. 385 - 388
DOI: 10.1126/science.1121790
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Reports

A Molecular Framework for Plant Regeneration

Jian Xu,1 Hugo Hofhuis,1 Renze Heidstra,1 Michael Sauer,2 Jirí Friml,2 Ben Scheres1*

Plants and some animals have a profound capacity to regenerate organs from adult tissues. Molecular mechanisms for regeneration have, however, been largely unexplored. Here we investigate a local regeneration response in Arabidopsis roots. Laser-induced wounding disrupts the flow of auxin—a cell-fate–instructive plant hormone—in root tips, and we demonstrate that resulting cell-fate changes require the PLETHORA, SHORTROOT, and SCARECROW transcription factors. These transcription factors regulate the expression and polar position of PIN auxin efflux–facilitating membrane proteins to reconstitute auxin transport in renewed root tips.

Thus, a regeneration mechanism using embryonic root stem-cell patterning factors first responds to and subsequently stabilizes a new hormone distribution.

1 Department of Molecular Genetics, Utrecht University, Padualaan 8, 3584CH Utrecht, Netherlands.
2 Zentrum für Molekularbiologie der Pflanzen, Universität Tübingen, Auf der Morgenstelle 3, 72076 Tübingen, Germany.

* To whom correspondence should be addressed. E-mail: b.scheres{at}bio.uu.nl

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