How Does Auxin Enhance Cell Elongation? Roles of Auxin-Binding Proteins and Potassium Channels in Growth Control

• Published in: Plant biology (Stuttgart, Germany) Germany), 2006-05, Vol.8 (3), p.346-352
• Main Authors: Christian, M., Steffens, B., Schenck, D., Burmester, S., Böttger, M., Lüthen, H.
• Format: Article
• Language: English
• Subjects: ABP1; Arabidopsis Proteins - physiology; Auxin; Cell Enlargement; elongation growth; F-Box Proteins - physiology; Gene Expression Regulation, Plant; Indoleacetic Acids; Plant Development; Plant Growth Regulators - physiology; Plant Proteins - physiology; Plants - metabolism; Potassium Channels - physiology; Proton-Translocating ATPases - physiology; Protoplasts - physiology; receptor; Receptors, Cell Surface - physiology; Review Article; signal transduction; TIR1
• ISSN: 1435-8603; 1438-8677
• DOI: 10.1055/s-2006-923965

Abstract Elongation growth and a several other phenomena in plant development are controlled by the plant hormone auxin. A number of recent discoveries shed light on one of the classical problems of plant physiology: the perception of the auxin signal. Two types of auxin receptors are currently known: the AFB/TIR family of F box proteins and ABP1. ABP1 appears to control membrane transport processes (H + secretion, osmotic adjustment) while the TIR/AFBs have a role in auxin-induced gene expression. Models are proposed to explain how membrane transport (e.g., K + and H + fluxes) can act as a cross-linker for the control of more complex auxin responses such as the classical stimulation of cell elongation.