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

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Title Rice auxin influx carrier OsAUX1 facilitates root hair elongation in response to low external phosphate
 
Creator Giri, Jitender
Bhosale, Rahul
Huang, Guoqiang
Pandey, Bipin K.
Parker, Helen
Zappala, Susan
Yang, Jing
Dievart, Anne
Bureau, Charlotte
Ljung, Karin
Price, Adam
Rose, Terry
Larrieu, Antoine
Mairhofer, Stefan
Sturrock, Craig J.
White, Philip
Dupuy, Lionel
Hawkesford, Malcolm
Perin, Christophe
Liang, Wanqi
Peret, Benjamin
Hodgman, Charlie T.
Lynch, Jonathan
Wissuwa, Matthias
Zhang, Dabing
Pridmore, Tony
Mooney, Sacha J.
Guiderdoni, Emmanuel
Swarup, Ranjan
Bennett, Malcolm J.
 
Subject Abiotic
Auxin
OsAUX1
external phosphate
Rice auxin
 
Description Accepted date: 16 March 2018
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.
This work was supported by the awards from the Biotechnology and Biological Sciences
Research Council [grant numbers BB/G023972/1, BB/R013748/1, BB/L026848/1,
BB/M018431/1, BB/PO16855/1, BB/M001806/1, BB/P010520/1]; the European Research
Council FUTUREROOTS Advanced Investigator grant [grant number 294729];
Leverhulme Trust [grant number RPG-2016-409]; Royal Society [grant number
WM130021, NA140281]; Newton International Fellowship (NF140287) and British
Council Newton Bhabha (228144076). This work was also supported by funds from the
University of Nottingham Future Food Beacon of Excellence Nottingham Research and
PhD+ fellowship schemes; the Interuniversity Attraction Poles Program initiated by the
Belgian Science Policy Office [P7/29]; the Swedish Governmental Agency for Innovation
Systems (VINNOVA), and the Swedish Research Council (V.R.) to K.L. We also thank
Roger Granbom (Swedish University of Agricultural Sciences) for technical assistance
and Gabriel Castrillo for commenting on the manuscript text. Part of this work has been
conducted at the Rice Functional Genomics REFUGE platform funded by Agropolis
Fondation in Montpellier, France.
 
Date 2018-04-16T07:32:45Z
2018-04-16T07:32:45Z
2018
 
Type Article
 
Identifier Nature Communications, 9(1): 1408
2041-1723
http://223.31.159.10:8080/jspui/handle/123456789/850
https://www.nature.com/articles/s41467-018-03850-4
10.1038/s41467-018-03850-4
 
Language en_US
 
Format application/pdf
 
Publisher Nature Publishing Group