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

Author

Listed:
  • Jitender Giri

    (University of Nottingham
    National Institute of Plant Genome Research (NIPGR))

  • Rahul Bhosale

    (University of Nottingham)

  • Guoqiang Huang

    (University of Nottingham
    Shanghai Jiao Tong University)

  • Bipin K. Pandey

    (University of Nottingham
    National Institute of Plant Genome Research (NIPGR))

  • Helen Parker

    (University of Nottingham)

  • Susan Zappala

    (University of Nottingham)

  • Jing Yang

    (University of Nottingham
    Shanghai Jiao Tong University)

  • 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)
    Southern Cross University)

  • Antoine Larrieu

    (University of Nottingham)

  • Stefan Mairhofer

    (University of Nottingham
    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
    Shanghai Jiao Tong University)

  • Benjamin Peret

    (University of Nottingham)

  • Charlie T. Hodgman

    (University of Nottingham)

  • Jonathan Lynch

    (University of Nottingham
    The Pennsylvania State University)

  • Matthias Wissuwa

    (Japan International Center for Agricultural Sciences (JIRCAS))

  • Dabing Zhang

    (Shanghai Jiao Tong University
    University of Adelaide, Waite Campus)

  • Tony Pridmore

    (University of Nottingham
    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)

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.

Suggested Citation

  • 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 , 2018. "Rice auxin influx carrier OsAUX1 facilitates root hair elongation in response to low external phosphate," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03850-4
    DOI: 10.1038/s41467-018-03850-4
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