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

Giri Jitender, Bhosale Rahul, Huang Guoqiang, Pandey Bipin K., Parker Hélène, Zappala Susan, Yang Jin, Diévart Anne, Bureau Charlotte, Ljung Karin, Price Adam H., Rose Terry, Larrieu Antoine, Mairhofer Stefan, Sturrock Craig, White Philip, Dupuy Lionel, Hawkesford Malcolm, Périn Christophe, Liang Wanqi, Péret Benjamin, Hodgman Charlie T., Lynch Jonathan P., Wissuwa Mathieu, Zhang Dabing, Pridmore Tony P., Mooney Sacha J., Guiderdoni Emmanuel, Swarup Ranjan, Bennett Malcolm J.. 2018. Rice auxin influx carrier OsAUX1 facilitates root hair elongation in response to low external phosphate. Nature Communications, 9:e1408, 7 p.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
Published version - Anglais
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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.

Mots-clés Agrovoc : riz

Mots-clés libres : Auxin, Root, Rice, Root hair, Low phosphate, Auxin reporter

Classification Agris : F61 - Plant physiology - Nutrition

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Agence(s) de financement européenne(s) : European Commission, European Research Council

Programme de financement européen : FP7

Projet(s) de financement européen(s) : Redesigning root architecture for improved crop performance

Auteurs et affiliations

  • Giri Jitender, University of Nottingham (GBR)
  • Bhosale Rahul, University of Nottingham (GBR)
  • Huang Guoqiang, Shanghai Jiaotong University (CHN)
  • Pandey Bipin K., University of Nottingham (GBR)
  • Parker Hélène, University of Nottingham (GBR)
  • Zappala Susan, University of Nottingham (GBR)
  • Yang Jin, University of Nottingham (GBR)
  • Diévart Anne, CIRAD-BIOS-UMR AGAP (CHN) ORCID: 0000-0001-9460-4638
  • Bureau Charlotte, CIRAD-BIOS-UMR AGAP (FRA)
  • Ljung Karin, Swedish University of Agricultural Sciences (SWE)
  • Price Adam H., University of Aberdeen (GBR)
  • Rose Terry, JIRCAS (JPN)
  • Larrieu Antoine, University of Nottingham (GBR)
  • Mairhofer Stefan, University of Nottingham (GBR)
  • Sturrock Craig, University of Nottingham (GBR)
  • White Philip, The James Hutton Institute (GBR)
  • Dupuy Lionel, The James Hutton Institute (GBR)
  • Hawkesford Malcolm, Rothamsted Research (GBR)
  • Périn Christophe, CIRAD-BIOS-UMR AGAP (FRA)
  • Liang Wanqi, University of Nottingham (GBR)
  • Péret Benjamin, University of Nottingham (GBR)
  • Hodgman Charlie T., University of Nottingham (GBR)
  • Lynch Jonathan P., Pennsylvania State University (USA)
  • Wissuwa Mathieu, JIRCAS (JPN)
  • Zhang Dabing, Shanghai Jiaotong University (CHN)
  • Pridmore Tony P., University of Nottingham (GBR)
  • Mooney Sacha J., University of Nottingham (GBR)
  • Guiderdoni Emmanuel, CIRAD-BIOS-UMR AGAP (FRA)
  • Swarup Ranjan, Nottingham University (GBR)
  • Bennett Malcolm J., University of Nottingham (GBR) - auteur correspondant

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