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

Giri, Jitender and Bhosale, Rahul and Huang, Guoqiang and Pandey, Bipin K. and Parker, Helen and Zappala, Susan and Yang, Jing and Dievart, Anne and Bureau, Charlotte and Ljung, Karin and Price, Adam and Rose, Terry and Larrieu, Antoine and Mairhofer, Stefan and Sturrock, Craig J. and White, Philip and Dupuy, Lionel and Hawkesford, Malcolm and Perin, Christophe and Liang, Wanqi and Peret, Benjamin and Hodgman, Charlie T. and Lynch, Jonathan and Wissuwa, Matthias and Zhang, Dabing and Pridmore, Tony and Mooney, Sacha J. and Guiderdoni, Emmanuel and Swarup, Ranjan and Bennett, Malcolm J. (2018) Rice auxin influx carrier OsAUX1 facilitates root hair elongation in response to low external phosphate. Nature Communications, 9 (1). 1408/1-1408/7. ISSN 2041-1723

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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.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences
University of Nottingham, UK > Faculty of Science > School of Computer Science
Identification Number: doi10.1038/s41467-018-03850-4
Depositing User: Eprints, Support
Date Deposited: 12 Apr 2018 14:24
Last Modified: 13 Apr 2018 05:33
URI: http://eprints.nottingham.ac.uk/id/eprint/51120

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