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The sHSP22 heat-shock protein requires the ABI1 protein phosphatase to modulate polar auxin transport and downstream responses

Yan li Li, Yaqiong Li, Yongchang Liu, Yaorong Wu, Qi Xie
Yan li Li
Chinese Academy of Sciences CITY: Beijing China [CN]
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Yaqiong Li
Institute of Genetics and Developmental Biology, University of Chinese Academy of Sciences CITY: Beijing China [CN]
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Yongchang Liu
State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences CITY: Beijing STATE: Chaoyang District China [CN]
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Yaorong Wu
Chinese Academy of Sciences CITY: Beijing China [CN]
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Qi Xie
Institute of Genetics and Developmental Biology CITY: No.1 West Beichen Road,Chaoyang District, Beijing POSTAL_CODE: 100101 China [CN]
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  • For correspondence: qxie@genetics.ac.cn

Published January 2018. DOI: https://doi.org/10.1104/pp.17.01206

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  • {copyright, serif} 2018 American Society of Plant Biologists. All rights reserved.

Abstract

The phytohormones abscisic acid (ABA) and indole-3-acetic acid (IAA) response pathways interact synergistically or antagonistically to regulate plant development and environmental adaptation. Here, we show that ABI1, a key negative regulator of ABA signaling, is essential for auxin-modulated root development. We performed a microarray analysis using the loss-of-function mutant abi1-3 and Col-0 seedlings treated with IAA. For sHSP22, an endoplasmic reticulum (ER) small heat shock protein-encoding gene, the induction by IAA was dependent on ABI1. shsp22 displayed enhanced sensitivity to ABA in primary root growth. In contrast, overexpression of full-length, but not truncated sHSP22 lacking signal peptide and ER-retention sequences, resulted in decreased ABA sensitivity. Overexpressed (OX) sHSP22 partially rescued the ABA hypersensitivity of abi1-3. In addition, sHSP22 is involved in auxin-regulated hypocotyl elongation at high temperature treatment. sHSP22 also affected accumulation of auxin efflux carrier PIN proteins due to potentiated intracellular trafficking. And sHSP22 OX lines initiated more lateral roots after auxin application. Our results suggest that sHSP22 regulates auxin response through modulating auxin polar transport, and ABI1-sHSP22 provides a novel module orchestrating ABA and auxin signaling crosstalk in Arabidopsis.

  • Received August 28, 2017.
  • Accepted December 22, 2017.
  • Published December 29, 2017.

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sHSP22 modulates plant response to ABA and auxin
Yan li Li, Yaqiong Li, Yongchang Liu, Yaorong Wu, Qi Xie
Plant Physiology Jan 2018, pp.01206.2017; DOI: 10.1104/pp.17.01206

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sHSP22 modulates plant response to ABA and auxin
Yan li Li, Yaqiong Li, Yongchang Liu, Yaorong Wu, Qi Xie
Plant Physiology Jan 2018, pp.01206.2017; DOI: 10.1104/pp.17.01206
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Plant Physiology: 176 (4)
Plant Physiology
Vol. 176, Issue 4
Apr 2018
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