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 Matthias, 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.

https://doi.org/10.1038/s41467-018-03850-4

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Outlier, Sujet : MULTIDISCIPLINARY SCIENCES

Résumé : 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 - Physiologie végétale - Nutrition

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

Agences de financement européennes : European Commission, European Research Council

Programme de financement européen : FP7

Projets sur financement : (EU) Redesigning root architecture for improved crop performance

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