Paclobutrazol (PBZ) and its Metabolic Function in Agriculture: A Review

Authors: Kumar A*

DOI: 10.23880/oajbi-16000113

Volume 2, Issue 1

Abstract

The plant growth retardant paclobutrazol, (PP333) (2RS, 3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)pentan-3-ol, inhibits specifically the three steps in the oxidation of the gibberellin precursorent kaurene toent-kaurenoic acid in a cell-free system from Cucurbita maxima endosperm. Paclobutrazol (PBZ) is a plant growth retardant and triazole fungicide. It is a known antagonist of the plant hormone gibberellin. It acts by inhibiting gibberellin biosynthesis, reducing internodial growth to give stouter stems, increasing root growth, causing early fruit set and increasing seedset in plants. ). It is a synthetic compound [(2 RS, 3 RS) -1- (4-chlorophenyl) 4, 4-dimethyl-2- (1 H-1, 2, 4-triazol-1-yl) -pentan-3 ol] that inhibits vegetative growth [6,8], belonging to the triazole group. Chemical properties of PBZ include: molecular weight 293.8, molecular formula C15H20ClN3O, melting point 165°C–166°C, density 1.22 g ml–1 and water solubility 35 mg L–1. PBZ is a hydrophobic and slightly polar molecule, with hydrophilic parts. Paclobutrazol is an inhibitor of enzymes which use cytochrome P450 as a cofactor.

Keywords: Triazoles; Strigolactone Inhibitors; Phytohormones; MOFs

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