Rice auxin influx carrier OsAUX1 facilitates root hair elongation in response to low external phosphate

Jitender Giri, Rahul Bhosale, Guoqiang Huang, Bipin K. Pandey, Helen Parker, Susan Zappala, Jing Yang, Anne Dievart, Charlotte Bureau, Karin Ljung, Adam Price, Terry Rose, Antoine Larrieu, Stefan Mairhofer, Craig J. Sturrock, Philip White, Lionel Dupuy, Malcolm Hawkesford, Christophe Perin, Wanqi Liang, Benjamin Peret, Charlie T. Hodgman, Jonathan Lynch, Matthias Wissuwa, Dabing Zhang, Tony Pridmore, Sacha J. Mooney, Emmanuel Guiderdoni, Ranjan Swarup and Malcolm J. Bennett ()
Additional contact information
Jitender Giri: University of Nottingham
Rahul Bhosale: University of Nottingham
Guoqiang Huang: University of Nottingham
Bipin K. Pandey: University of Nottingham
Helen Parker: University of Nottingham
Susan Zappala: University of Nottingham
Jing Yang: University of Nottingham
Anne Dievart: CIRAD, UMR AGAP
Charlotte Bureau: CIRAD, UMR AGAP
Karin Ljung: Swedish University of Agricultural Sciences
Adam Price: University of Aberdeen
Terry Rose: Japan International Center for Agricultural Sciences (JIRCAS)
Antoine Larrieu: University of Nottingham
Stefan Mairhofer: University of Nottingham
Craig J. Sturrock: University of Nottingham
Philip White: The James Hutton Institute
Lionel Dupuy: The James Hutton Institute
Malcolm Hawkesford: Rothamsted Research
Christophe Perin: CIRAD, UMR AGAP
Wanqi Liang: University of Nottingham
Benjamin Peret: University of Nottingham
Charlie T. Hodgman: University of Nottingham
Jonathan Lynch: University of Nottingham
Matthias Wissuwa: Japan International Center for Agricultural Sciences (JIRCAS)
Dabing Zhang: Shanghai Jiao Tong University
Tony Pridmore: University of Nottingham
Sacha J. Mooney: University of Nottingham
Emmanuel Guiderdoni: CIRAD, UMR AGAP
Ranjan Swarup: University of Nottingham
Malcolm J. Bennett: University of Nottingham

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Root traits such as root angle and hair length influence resource acquisition particularly for immobile nutrients like phosphorus (P). Here, we attempted to modify root angle in rice by disrupting the OsAUX1 auxin influx transporter gene in an effort to improve rice P acquisition efficiency. We show by X-ray microCT imaging that root angle is altered in the osaux1 mutant, causing preferential foraging in the top soil where P normally accumulates, yet surprisingly, P acquisition efficiency does not improve. Through closer investigation, we reveal that OsAUX1 also promotes root hair elongation in response to P limitation. Reporter studies reveal that auxin response increases in the root hair zone in low P environments. We demonstrate that OsAUX1 functions to mobilize auxin from the root apex to the differentiation zone where this signal promotes hair elongation when roots encounter low external P. We conclude that auxin and OsAUX1 play key roles in promoting root foraging for P in rice.

Date: 2018
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DOI: 10.1038/s41467-018-03850-4

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