The ARF7 and ARF19 Transcription Factors Positively Regulate PHOSPHATE STARVATION RESPONSE1 in Arabidopsis Roots

Plant Physiology
Ke-Lin HuangFeng Ren

Abstract

PHOSPHATE STARVATION RESPONSE1 (PHR1) is a key regulatory component of the response to phosphate (Pi) starvation. However, the regulation of PHR1 in this response remains poorly understood. Here, we report that PHR1 is a target of the transcription factors AUXIN RESPONSE FACTOR7 (ARF7) and ARF19 and is positively regulated by auxin signaling in Arabidopsis (Arabidopsis thaliana) roots. PHR1 expression was induced by exogenous auxin and suppressed by auxin transport inhibitors in Arabidopsis roots. In the PHR1 promoter, three auxin-response elements, which are bound directly by ARF7 and ARF19, were shown to be essential for PHR1 expression. The arf7, arf19, and arf7 arf19 mutants showed down-regulated expression of PHR1 and downstream Pi starvation-induced genes in roots; they also exhibited defective Pi uptake in roots and overaccumulation of anthocyanin in shoots. The induction of lateral root formation in response to low Pi and to exogenous auxin was decreased in the phr1 mutant, whereas the expression of LATERAL ORGAN BOUNDARIES-DOMAIN16 (LBD16) and LBD29 was not changed significantly. PHR1 acted independently of LBD16 and LBD29 in the regulation of lateral root formation in response to low Pi. Under low-Pi conditions, later...Continue Reading

Citations

Jan 30, 2020·Journal of Experimental Botany·Kris VissenbergSébastjen Schoenaers
Feb 8, 2020·The Plant Journal : for Cell and Molecular Biology·Di ZhaoTianhong Li
Oct 17, 2018·International Journal of Molecular Sciences·Dehua LiaoGuohua Xu
Mar 2, 2019·Annual Review of Plant Biology·Hans MotteTom Beeckman
Dec 11, 2019·Genes·Paweł Sega, Andrzej Pacak
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Mar 25, 2019·Journal of Plant Research·Michitaro Shibata, Keiko Sugimoto
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Jan 13, 2021·Cold Spring Harbor Perspectives in Biology·Jorge J Casal, José M Estevez
Apr 17, 2021·Frontiers in Plant Science·María José GarcíaFrancisco Javier Romera
May 8, 2021·The Plant Journal : for Cell and Molecular Biology·Zhaojun YangHong Liao
Jun 3, 2021·International Journal of Molecular Sciences·María José GarcíaFrancisco Javier Romera
Dec 18, 2021·Molecular Plant·Zhongtao JiaNicolaus von Wirén

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