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Auxins, cytokinins and gibberellins are the plant hormones that promote plant growth.
Gibberrellins induce bolting.
Auxins induce the formation roots at lower concentrations.
The prevalence and effect of auxins in plants was first demonstrated by a French biologist Frits Warmot Went (1903-1990) by performing a series of experiments in Avena coleoptiles.
Ethylene is a gaseous plant hormone that also acts as a growth inhibitor.
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