An auxin-regulable oscillatory circuit drives the root clock in Arabidopsis.

Abstract:

:In Arabidopsis, the root clock regulates the spacing of lateral organs along the primary root through oscillating gene expression. The core molecular mechanism that drives the root clock periodicity and how it is modified by exogenous cues such as auxin and gravity remain unknown. We identified the key elements of the oscillator (AUXIN RESPONSE FACTOR 7, its auxin-sensitive inhibitor IAA18/POTENT, and auxin) that form a negative regulatory loop circuit in the oscillation zone. Through multilevel computer modeling fitted to experimental data, we explain how gene expression oscillations coordinate with cell division and growth to create the periodic pattern of organ spacing. Furthermore, gravistimulation experiments based on the model predictions show that external auxin stimuli can lead to entrainment of the root clock. Our work demonstrates the mechanism underlying a robust biological clock and how it can respond to external stimuli.

journal_name

Sci Adv

journal_title

Science advances

authors

Perianez-Rodriguez J,Rodriguez M,Marconi M,Bustillo-Avendaño E,Wachsman G,Sanchez-Corrionero A,De Gernier H,Cabrera J,Perez-Garcia P,Gude I,Saez A,Serrano-Ron L,Beeckman T,Benfey PN,Rodríguez-Patón A,Del Pozo JC,Wabnik K

doi

10.1126/sciadv.abd4722

subject

Has Abstract

pub_date

2021-01-01 00:00:00

issue

1

issn

2375-2548

pii

7/1/eabd4722

journal_volume

7

pub_type

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