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

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Bhosale, Rahul | Giri, Jitender | Pandey, Bipin | Giehl, Ricardo | Hartmann, Anja | Traini, Richard | Truskina, Jekaterina | Leftley, Nicola | Hanlon, Meredith | Swarup, Kamal | Rashed, Afaf | Voss, Ute | Alonso, Jose | Stepanova, Anna | Yun, Jeonga | Ljung, Karin | Brown, Kathleen | Lynch, Jonathan, P | Dolan, Liam | Vernoux, Teva | Bishopp, Anthony | Wells, Darren | von Wirén, Nicolaus | Bennett, Malcolm | Swarup, Ranjan

Edité par CCSD ; Nature Publishing Group -

International audience. 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.

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