Auxin Influx Carrier AUX1 Confers Acid Resistance for Arabidopsis Root Elongation Through the Regulation of Plasma Membrane H+-ATPase.

ABSTRACT: The plant plasma membrane (PM) H⁺-ATPase regulates pH homeostasis and cell elongation in roots through the formation of an electrochemical H⁺ gradient across the PM and a decrease in apoplastic pH; however, the detailed signaling for the regulation of PM H⁺-ATPases remains unclear. Here, we show that an auxin influx carrier, AUXIN RESISTANT1 (AUX1), is required for the maintenance of PM H⁺-ATPase activity and proper root elongation. We isolated a low pH-hypersensitive 1 (loph1) mutant by a genetic screen of Arabidopsis thaliana on low pH agar plates. The loph1 mutant is a loss-of-function mutant of the AUX1 gene and exhibits a root growth retardation restricted to the low pH condition. The ATP hydrolysis and H⁺ extrusion activities of

SUBMITTER: Inoue SI 

PROVIDER: S-EPMC5434668 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature