Coumarin-facilitated iron transport: An IRT1-independent strategy for iron acquisition in Arabidopsis thaliana.

ABSTRACT: Iron (Fe) is an essential micronutrient for plant growth and development. Despite its importance, Fe uptake in alkaline soils is challenging for most plants because of its poor bioavailability. Plants have evolved two main strategies to acquire Fe. Grass species release phytosiderophores (PS) into the rhizosphere and take up Fe as Fe(III)-PS complexes via specific transporters (strategy II). Non-grass species, such as Arabidopsis thaliana, reduce Fe(III) to Fe(II) at the root surface and transport Fe(II) into the root via the high-affinity transporter IRT1 (strategy I). Additionally, these species secrete catechol coumarins, such as fraxetin, into the rhizosphere to enhance Fe acquisition. Although the role of catechol coumarins in Fe reduction has been clearly demonstrated in acidic soils

SUBMITTER: Robe K 

PROVIDER: S-EPMC12447440 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature