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

Sassi, Massimiliano, Lu, Yanfen, Zhang, Yonghong, Wang, Juan, Dhonukshe, Pankaj, Blilou, Ikram, Dai, Minqiu, Li, Juan, Gong, Ximing, Jaillais, Yvon, Yu, Xuhong, Traas, Jan, Ruberti, Ida, Wang, Haiyang, Scheres, Ben, Vernoux, Teva and Xu, Jian 2012. COP1 mediates the coordination of root and shoot growth by light through modulation of PIN1-and PIN2-dependent auxin transport in Arabidopsis. Development 139 (18) , pp. 3402-3412. 10.1242/dev.078212

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QK Botany
Uncontrolled Keywords: Arabidopsis; Root growth; Light; Auxin transport; COP1; PIN1; PIN2
Publisher: The Company of Biologists
ISSN: 0950-1991
Last Modified: 16 Jan 2019 21:10
URI: http://orca.cf.ac.uk/id/eprint/57685

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