外源生长延缓剂对盆栽木芙蓉生长及开花的调控效应OA

Taking one-year-old early-flowering variety of Hibiscus mutabilis,'Baihua Huacai'potted seedlings as test materials,a pot experiment was conducted to investigate the regulatory effect of different concentrations and ratios of exogenous growth retardants(paclobutrazol/mepiquat chloride and uniconazole/mepiquat chloride)on their growth and flowering,in order to provide a reference for plant architecture regulation in potted Hibiscus mutabilis and its application in home gardening.The results showed that the growth retardant treatments significantly inhibited the early vegetative growth of the plants.At 30 days after treatment,plant height,stem diameter,and leaf length and width in all treatment groups were significantly lower than those in the control.However,a significant compensatory growth phenomenon was observed 30 days after treatment,with substantial increases in the net growth of plant height and stem diameter,exhibiting a multi-peak growth pattern.The retardant treatments also optimized branch architecture,significantly increasing the number of branches and shortening internode length.In terms of flowering,the treatments delayed the first flowering period and shortened its duration,while increasing the proportion of flowers in the second flowering period.In conclusion,the combined application of appropriate concentrations of paclobutrazol and mepiquat chloride was found to be effective in achieving plant dwarfing,promoting branching,and regulating the flowering period.