LAUSR

Brassinolide (BR) plays an important role in physiological and biochemical processes of plants. The natural resources of Pinellia ternata (P. ternata) were gradually exhausted, while the yield of artificial cultivation was limited due to the uncertainty of technology and climate. The paper mainly studied BR effects on the yield and quality of two P. ternata cultivars (peach leaf shape and willow leaf shape) on the 15th and 105th day after treatments, which could provide references for P. ternata cultivation. Six levels of BR (0, 0.05, 0.1, 0.5, 1, and 2 mg/L) were sprayed at three-leaf fully expanded. The results showed that BR treatments increased the yield and quality of two P. ternata cultivars. After the 15th day of treatments, BR was beneficial to increase DPPH radical scavenging activity and contents of total flavone, ascorbic acid, and soluble sugar in tuber of two P. ternata cultivars. After the 105th day of BR treatments, peach leaf P. ternata had higher yield and contents of total alkaloids, free amino acid, and soluble protein content in tuber and bulbil, and willow leaf P. ternata had higher DPPH radical scavenging activity and contents of total flavone and soluble sugar in tuber and bulbil. Comprehensive analysis showed that the optimum BR concentration was 2 mg/L for tuber and bulbil of peach leaf shape and was 0.5–1 mg/L for tuber and bulbil of willow leaf shape, respectively.