Abstract: To investigate the effects of exogenous hormone concentrations on the growth and development of Gerbera jamesonii, foliar application treatments with different concentrations (100, 200, 300 mg/L) of gibberellic acid（GA₃） (T1, T2, T3) and 6-Benzylaminopurine(6-BA) (T4, T5, T6) were set up, with deionized water as the control (CK, T7). By measuring the growth, nutrient, physiological and biochemical indices of Gerbera jamesonii, the effects of different treatments were comprehensively analyzed to select the optimal treatment. The results showed that the budding time for T4 was 36 days earlier than that for CK; T3 had the longest flowering duration (18.71 d) and the greatest scape height. Exogenous hormones significantly affected the physiological indices of Gerbera jamesonii, with similar trends observed in SOD activity, PPO activity and MDA content, all of which were highest in T4. Exogenous hormones generally reduced the belowground biomass of Gerbera jamesonii, but the root-shoot ratios of all treatments were significantly higher than those of CK except for T5. Different treatments had significant effects on the nutrient contents of the aboveground and belowground parts of the plants, with the overall nutrient contents of the aboveground parts higher than those of the belowground parts, and the total nitrogen content of the aboveground parts in most treatments was significantly higher than that of CK. The comprehensive evaluation based on principal component analysis and the membership function method revealed that the order of the average membership values of each treatment was T1 (0.72) > T3 (0.60) > T2 (0.59) > T4 (0.58) > T5 (0.57) > T6 (0.46) > T7 (0.44).

Key words: Gerbera jamesonii, exogenous hormones, growth and development, membership function analysis, quality evaluation