Journal
GENES & DEVELOPMENT
Volume 30, Issue 4, Pages 471-483Publisher
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/gad.276964.115
Keywords
lateral root organogenesis; mechanical forces; meristem proliferation activity; auxin
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Funding
- European Research Council Starting Independent Research grant [ERC-2007-Stg-207362-HCPO]
- Research Foundation-Flanders [G033711N]
- Austrian Science Fund [FWF01_I1774S]
- Federation of European Biochemical Sciences
- Scientific Service Units (SSU) of Institute of Science and Technology Austria (IST-Austria) through resources provided by the Bioimaging Facility (BIF)
- Life Science Facility (LSF)
- Austrian Science Fund (FWF) [I 1774] Funding Source: researchfish
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To sustain a lifelong ability to initiate organs, plants retain pools of undifferentiated cells with a preserved proliferation capacity. The root pericycle represents a unique tissue with conditional meristematic activity, and its tight control determines initiation of lateral organs. Here we show that the meristematic activity of the pericycle is constrained by the interaction with the adjacent endodermis. Release of these restraints by elimination of endodermal cells by single-cell ablation triggers the pericycle to re-enter the cell cycle. We found that endodermis removal substitutes for the phytohormone auxin-dependent initiation of the pericycle meristematic activity. However, auxin is indispensable to steer the cell division plane orientation of new organ-defining divisions. We propose a dual, spatiotemporally distinct role for auxin during lateral root initiation. In the endodermis, auxin releases constraints arising from cell-to-cell interactions that compromise the pericycle meristematic activity, whereas, in the pericycle, auxin defines the orientation of the cell division plane to initiate lateral roots.
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