COP1 mediates the coordination of root and shoot growth by light through modulation of PIN1-and PIN2-dependent auxin transport in Arabidopsis - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Development (Cambridge, England) Year : 2012

COP1 mediates the coordination of root and shoot growth by light through modulation of PIN1-and PIN2-dependent auxin transport in Arabidopsis

Minqiu Dai
  • Function : Author
Yvon Jaillais
Xuhong Yu
  • Function : Author
Jan Traas
  • Function : Author
  • PersonId : 1136535
Haiyang Wang
  • Function : Author
Teva Vernoux

Abstract

When a plant germinates in the soil, elongation of stem-like organs is enhanced whereas leaf and root growth is inhibited. How these differential growth responses are orchestrated by light and integrated at the organismal level to shape the plant remains to be elucidated. Here, we show that light signals through the master photomorphogenesis repressor COP1 to coordinate root and shoot growth in Arabidopsis. In the shoot, COP1 regulates shoot-to-root auxin transport by controlling the transcription of the auxin efflux carrier gene PIN-FORMED1 (PIN1), thus appropriately tuning shoot-derived auxin levels in the root. This in turn directly influences root elongation and adapts auxin transport and cell proliferation in the root apical meristem by modulating PIN1 and PIN2 intracellular distribution in the root in a COP1-dependent fashion, thus permitting a rapid and precise tuning of root growth to the light environment. Our data identify auxin as a long-distance signal in developmental adaptation to light and illustrate how spatially separated control mechanisms can converge on the same signaling system to coordinate development at the whole plant level.

Dates and versions

hal-02651195 , version 1 (29-05-2020)

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Massimiliano Sassi, Yanfen Lu, Yonghong Zhang, Juan Wang, Pankaj Dhonukshe, et al.. COP1 mediates the coordination of root and shoot growth by light through modulation of PIN1-and PIN2-dependent auxin transport in Arabidopsis. Development (Cambridge, England), 2012, 139 (18), pp.3402 - 3412. ⟨10.1242/dev.078212⟩. ⟨hal-02651195⟩
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