Effect of Paclobutrazol Application on Plant Growth and Flower Quality in Herbaceous Peony

Herbaceous peony (Paeonia lactiflora Pall.) is an important ornamental plant worldwide. In its natural state, P. often manifests traits like rapidly elongating internodal growth, loose types, and soft inflorescence stems. However, very little has been known about the measures for controlling these traits. This study investigated effect of applying paclobutrazol (PBZ) on growth flower quality in lactiflora. The results indicated that PBZ application reduced height (8.05%), crown width (14.72%), leaf area (10.90%), but increased thickness (18.18%) stem diameter (over 11%) Meanwhile, was also found to increase chlorophyll (Chl) a (29.63%), Chl b (33.33%), a+b (30.56%), SPAD (27.32%), relative water content (0.47%), soluble sugar (5.09%) activities three antioxidant enzymes (superoxide dismutase 169.66%, peroxidase 3.59%, catalase 319.30%), decreased electrical conductivity (18.52%). Additionally, affect flowering lactiflora, increasing fresh weight only flower-bud stage. initiates bloom stage, where there decrease total aromatic compounds except faded color by reducing anthocyanin. These demonstrated can regulate types with no significant values. might provide theoretical basis further use urban landscape spaces.