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

Authors :
Bhosale R
Giri J
Pandey BK
Giehl RFH
Hartmann A
Traini R
Truskina J
Leftley N
Hanlon M
Swarup K
Rashed A
Voß U
Alonso J
Stepanova A
Yun J
Ljung K
Brown KM
Lynch JP
Dolan L
Vernoux T
Bishopp A
Wells D
von Wirén N
Bennett MJ
Swarup R
Source :
Nature communications [Nat Commun] 2018 Apr 12; Vol. 9 (1), pp. 1409. Date of Electronic Publication: 2018 Apr 12.
Publication Year :
2018

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.

Details

Language :
English
ISSN :
2041-1723
Volume :
9
Issue :
1
Database :
MEDLINE
Journal :
Nature communications
Publication Type :
Academic Journal
Accession number :
29651114
Full Text :
https://doi.org/10.1038/s41467-018-03851-3