Knowra Indole-3-acetic acid Indole-3-acetic acid Indole-3-acetic acid (IAA) is the principal naturally occurring auxin in plants. It regulates growth and development, including cell elongation, root formation, and responses to light and gravity.
Auxin signaling : A plant signaling pathway in which auxin promotes changes in gene expression and cell behavior. IAA activates this pathway through receptors that regulate Aux/IAA repressor proteins.
Rooting hormone : A substance applied to plant cuttings to stimulate adventitious root formation. IAA and synthetic auxins can induce roots on cuttings that otherwise root poorly.
Auxin : A class of plant hormones that regulates growth, development, and environmental responses. IAA is the best-known naturally occurring member of this hormone class.
Phototropism : Directional plant growth in response to light. Uneven IAA distribution across a shoot helps produce bending toward light.
Polar auxin transport : Directional movement of auxin between plant cells, driven by the asymmetric placement of transport proteins. It creates local IAA gradients that guide growth and pattern formation.
Plant tissue culture : The growth of plant cells, tissues, or organs under sterile, controlled conditions. IAA concentrations help control rooting, callus growth, and development in culture.
Indole : An aromatic bicyclic compound composed of a benzene ring fused to a pyrrole ring. IAA contains an indole group, which gives the molecule its name and chemical scaffold.
Gravitropism : Directional plant growth in response to gravity. Gravity-driven IAA redistribution causes different growth responses in roots and shoots.
TIR1 : A plant F-box protein that acts as an auxin receptor within an SCF ubiquitin ligase complex. IAA binding helps TIR1 target Aux/IAA repressors for degradation.
2,4-Dichlorophenoxyacetic acid : A synthetic auxin used as a herbicide and in plant tissue culture. It mimics some IAA effects but is more persistent and can kill broadleaf plants.
Show all 21