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

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 ext...

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Bibliographic Details
Published in:	Nature communications 2018-04, Vol.9 (1), p.1409-9, Article 1409
Main Authors:	Bhosale, Rahul, Giri, Jitender, Pandey, Bipin K, Giehl, Ricardo F H, 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 M, Lynch, Jonathan P, Dolan, Liam, Vernoux, Teva, Bishopp, Anthony, Wells, Darren, von Wirén, Nicolaus, Bennett, Malcolm J, Swarup, Ranjan
Format:	Article
Language:	eng
Subjects:	Arabidopsis Arabidopsis - drug effects Arabidopsis - genetics Arabidopsis - growth & development Arabidopsis - metabolism Arabidopsis Proteins - genetics Arabidopsis Proteins - metabolism Architecture Basic Helix-Loop-Helix Transcription Factors - genetics Basic Helix-Loop-Helix Transcription Factors - metabolism Biochemistry and Molecular Biology Biokemi och molekylärbiologi Biosynthesis Botanics Botanik Botany Elongation Enzymes Gene expression Gene Expression Regulation, Plant Gravitropism - physiology Homeostasis Indoleacetic Acids - metabolism Life Sciences Mutants Organogenesis, Plant - drug effects Organogenesis, Plant - genetics Phosphates Phosphates - deficiency Phosphates - pharmacology Plant growth Plant Growth Regulators - metabolism Plant Roots - drug effects Plant Roots - genetics Plant Roots - growth & development Plant Roots - metabolism Plant sciences Plants, Genetically Modified Stress, Physiological Synthesis Transcription factors Transcription Factors - genetics Transcription Factors - metabolism Transport Vegetal Biology
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Summary:	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.
ISSN:	2041-1723 2041-1723