Paclobutrazol (PBZ) is a triazole-containing plant growth retardant that is known to inhibit the biosynthesis of gibberellins.^1,2It also has antifungal activities.³PBZ, which is transported acropetally in plants, can also suppress the synthesis of abscisic acid and induce chilling tolerance in plants.^1,4,5PBZ is typically used to support research on the role of gibberellins in plant biology.^6,7

1.Wang, S.Y., Sun, T., and Faust, M.Translocation of paclobutrazol, a gibberellin biosynthesis inhibitor, in apple seedlingsPlant Physiology82(1)11-14(1986) 2.Rademacher, W.Growth retardants: Effects on gibberellin biosynthesis and other metabolic pathwaysAnnual Reviews of Plant Physiology and Plant Molecular Biology51501-531(2000) 3.Storey, G.K., and Gardner, W.A.Sensitivity of the entomogenous fungus Beauveria bassiana to selected plant growth regulators and spray additivesApplied and Environmental Microbiology52(1)1-3(2016) 4.Norman, S.M., Bennett, R.D., Poling, S.M., et al.Paclobutrazol inhibits abscisic acid biosynthesis in Cercospora rosicolaPlant Physiology80(1)122-125(1986) 5.Pinhero, R.G., Rao, M.V., Paliyath, G., et al.Changes in activities of antioxidant enzymes and their relationship to genetic and paclobutrazol-induced chilling tolerance of maize seedlingsPlant Physiology114(2)695-704(2016) 6.Wang, G.L., Que, F., Xu, Z.S., et al.Exogenous gibberellin altered morphology, anatomic and transcriptional regulatory networks of hormones in carrot root and shootBMC Plant Biol.15(1)(2015) 7.Cho, S.H., Kang, K., Lee, S.H., et al.OsWOX3A is involved in negative feedback regulation of the gibberellic acid biosynthetic pathway in rice (Oryza sativa)Journal of Experimental Botanyerv5591-11(2016)