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

A - Papers appearing in refereed journals

Giri, J., Bhosale, R., Huang, G., Pandey, B. K., Parker, H., Zappala, S., Yang, J., Dievart, A., Bureau, C., Ljung, K., Price, A., Rose, T., Larrieu, A., Mairhofer, S., Sturrock, C. J., White, P., Dupuy, L., Hawkesford, M. J., Perin, C., Liang, W., Peret, B., Hodgman, C. T., Lynch, J., Wissuwa, M., Zhang, D., Pridmore, T., Mooney, S. J., Guiderdoni, E., Swarup, R. and Bennett, M. J. 2018. Rice auxin influx carrier OsAUX1 facilitates root hair elongation in response to low external phosphate. Nature Communications. 9, p. 1408.

AuthorsGiri, J., Bhosale, R., Huang, G., Pandey, B. K., Parker, H., Zappala, S., Yang, J., Dievart, A., Bureau, C., Ljung, K., Price, A., Rose, T., Larrieu, A., Mairhofer, S., Sturrock, C. J., White, P., Dupuy, L., Hawkesford, M. J., Perin, C., Liang, W., Peret, B., Hodgman, C. T., Lynch, J., Wissuwa, M., Zhang, D., Pridmore, T., Mooney, S. J., Guiderdoni, E., Swarup, R. and Bennett, M. J.
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.

Year of Publication2018
JournalNature Communications
Journal citation9, p. 1408
Digital Object Identifier (DOI)doi:10.1038/s41467-018-03850-4
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDesigning Future Wheat (DFW) [ISPG]
DFW - Designing Future Wheat - Work package 1 (WP1) - Increased efficiency and sustainability
Publisher's version
Output statusPublished
Publication dates
Online12 Apr 2018
Publication process dates
Accepted16 Mar 2018
PublisherNature Publishing Group
Copyright licenseCC BY
ISSN2041-1723

Permalink - https://repository.rothamsted.ac.uk/item/84762/rice-auxin-influx-carrier-osaux1-facilitates-root-hair-elongation-in-response-to-low-external-phosphate

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