Auxin facts for kids
Auxins are a class of plant hormones (or plant growth substances) with some morphogen-like characteristics. Auxins have a main role in coordination of many growth and behavioral processes in the plant's life cycle. they are essential for plant body development.
Auxins and their role in plant growth were first described by the Dutch scientist Frits Warmolt Went. Kenneth V. Thimann isolated auxin and found its chemical structure to be indole-3-acetic acid (IAA). Went and Thimann co-authored a book on plant hormones, Phytohormones, in 1937.
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The auxin signal cascade: In the absence of auxin, Aux/IAA bind to and suppress the transcriptional activity of ARFs. When auxin is present it forms a 'molecular glue' between TIR1 and Aux/IAAs, which leads to the degradation of these repressors. ARFs are then free to bind to DNA and to cause changes in transcription.
Auxin Facts for Kids. Kiddle Encyclopedia.