“…Dwarfism is generally associated with a defect in GA synthesis, perception, or metabolism (Thomas et al, 2005), and dominant Kn1 mutants, such as Kn1-N, are shorter than their normal siblings. When Kn1-N mutants were supplemented with GA, the severity of the knotted phenotype (number of knots on leaves) was reduced, while it was aggravated when treating plants with an inhibitor of GA synthesis (Kessler et al, 2006). Accumulation of ga2ox1 mRNA, which encodes an enzyme involved in inactivation of bioactive GA, is elevated in leaves of the dominant mutant Kn1-N (Kessler et al, 2006).…”