植物生长延缓剂对切花向日葵主要经济性状的影响.

In order to explore the effects of different plant growth retardants on the main economic traits of cut sunflower, in this study, Vincent cut sunflower was used as the test material, foliar spray treatments were carried out with different concentrations of PP333(40, 80, 160, 240 mg/L), CCC(100, 200, 400, 800 mg/L), and DPC(50, 100, 150, 200 mg/L) solutions with water as the control. The stem, leaf, and flower traits of cut sunflower were determined under different treatment conditions after reaching harvest maturity. The results showed that compared with the control, the 12 treatments showed the characteristics of reduced plant height, increased stem diameter, shortened internodes, increased diameter-to-height ratio, shortened petioles, thickened leaves, increased chlorophyll content, and increased flower diameter, indicating that the economic traits of Vincent cut sunflower were significantly improved and the quality of cut flowers was significantly improved. Among these treatments, PP333 240 mg/L, CCC 800 mg/L, and DPC 150 mg/L had the most significant effects on the economic traits of cut sunflower. Under 240 mg/L of PP333 treatment, the plant height of cut sunflower decreased by 24.1%, stem diameter increased by 41.6%, leaf thickness increased by 52%, SPAD value increased by 47.5%, and flower diameter increased by 26.3%. Under 800 mg/L of CCC treatment, plant height decreased by 15.8%, stem diameter increased by 35.7%, leaf thickness increased by 59.9%, SPAD value increased by 48%, and flower diameter increased by 24.8%.Under 150 mg/L of DPC treatment, the plant height decreased by 22.2%, the stem diameter increased by 44.5%, the leaf thickness increased by 74.8%, the SPAD value increased by 39.3%, and the flower diameter increased by 22.7%. Comprehensive comparative analysis showed that the economic traits of cut sunflower under 240 mg/L of PP333 treatment were the most prominent, and the comprehensive effect was the best. [ABSTRACT FROM AUTHOR]