A mechanistic framework for auxin dependent Arabidopsis root hair elongation to low external phosphate

Bhosale, Rahul and Giri, Jitender and Pandey, Bipin K. and Giehl, Ricardo F.H. and Hartmann, Anja and Traini, Richard and Truskina, Jekaterina and Leftley, Nicola and Hanlon, Meredith and Swarup, Kamal and Rashed, Afaf and Voß, Ute and Alonso, Jose and Stepanova, Anna and Yun, Jeonga and Ljung, Karin and Brown, Kathleen M. and Lynch, Jonathan P. and Dolan, Liam and Vernoux, Teva and Bishopp, Anthony and Wells, Darren and von Wirén, Nicolaus and Bennett, Malcolm J. and Swarup, Ranjan (2018) A mechanistic framework for auxin dependent Arabidopsis root hair elongation to low external phosphate. Nature Communications, 9 (1). 1409/1-1409/9. ISSN 2041-1723

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Abstract

Phosphate (P) is an essential macronutrient for plant growth. Roots employ adaptive mechanisms to forage for P in soil. Root hair elongation is particularly important since P is immobile. Here we report that auxin plays a critical role promoting root hair growth in Arabidopsis in response to low external P. Mutants disrupting auxin synthesis (taa1) and transport (aux1) attenuate the low P root hair response. Conversely, targeting AUX1 expression in lateral root cap and epidermal cells rescues this low P response in aux1. Hence auxin transport from the root apex to differentiation zone promotes auxin-dependent hair response to low P. Low external P results in induction of root hair expressed auxin-inducible transcription factors ARF19, RSL2, and RSL4. Mutants lacking these genes disrupt the low P root hair response. We conclude auxin synthesis, transport and response pathway components play critical roles regulating this low P root adaptive response.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences
Identification Number: https://doi.org/10.1038/s41467-018-03851-3
Depositing User: Eprints, Support
Date Deposited: 12 Apr 2018 14:36
Last Modified: 02 Jul 2018 09:19
URI: http://eprints.nottingham.ac.uk/id/eprint/51121

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