Ammonium Triggers Formation of Lateral Roots (IMAGE)

Leibniz Institute of Plant Genetics and Crop Plant Research

Ammonium Triggers Formation of Lateral Roots

Caption

Localized ammonium supply enhances the import and accumulation of shoot-derived auxin into the root vasculature, generating an auxin source for lateral auxin movement. AMT-dependent ammonium uptake stimulates proton release, leading to apoplastic acidification and protonation of auxin (IAA) to IAAH, which diffuses from the vasculature to outer root cells overlaying lateral root primordia. Facilitated import of protonated auxin into cortical and epidermal cells enhances expression of cell wall loosening enzymes, decreasing the mechanical resistance required for lateral root emergence.

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IPK/ Ying Liu

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