The nitrate transporter NRT2.1 directly antagonizes PIN7-mediated auxin transport for root growth adaptation.

ABSTRACT: As a crucial nitrogen source, nitrate (NO₃^-) is a key nutrient for plants. Accordingly, root systems adapt to maximize NO₃^- availability, a developmental regulation also involving the phytohormone auxin. Nonetheless, the molecular mechanisms underlying this regulation remain poorly understood. Here, we identify low-nitrate-resistant mutant (lonr) in Arabidopsis (Arabidopsis thaliana), whose root growth fails to adapt to low-NO₃^- conditions. lonr2 is defective in the high-affinity NO₃^- transporter NRT2.1. lonr2 (nrt2.1) mutants exhibit defects in polar auxin transport, and their low-NO₃^--induced root phenotype depends on the PIN7 auxin expor

SUBMITTER: Wang Y 

PROVIDER: S-EPMC10288568 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature