| 【Objective】The effects of 2, 4-epibrassinolide (EBR) on the growth and flower stalk nutritional quality
of flowering Chinese cabbage (Brassica parachinensis Bailey) were studied in order to screen out optimal application
concentration and spraying period. 【Method】With the cultivar “Sijiu Youqing” as tested material, the effects of
exogenous EBR at different concentrations and spraying periods on the growth and flower stalk nutritional quality of flowering
Chinese cabbage were analyzed. 【Result】Spraying EBR could affect the growth and nutrition indicators of flowering
Chinese cabbage. Spraying low concentrations (0.01-0.05 mg/L) of EBR significantly increased the flower stalk length and
diameter and the contents of Vc, chlorophyll, total soluble sugar, soluble protein, total nitrogen and total potassium, while
reduced the cellulose content. However, spraying high concentrations of EBR (0.14-0.17 mg/L) significantly increased the total nitrogen, total phosphorus and total potassium contents of flowering stalk. Based on the plant growth and nutritional quality
after treatments with EBR at three growth periods, spraying low concentrations (0.01-0.05 mg/L) of EBR at seedling stage had
the best effect on improving the growth and nutrition indicators of flowering stalks, and spraying 0.05 mg/L of EBR had the
largest reduction in the cellulose content, which reduced from 5.71% of the control to 3.88%. Spraying 0.05 mg/L of EBR at the
stages of seedling and before-bolting had the largest increase effect on the total nitrogen content, which increased from 0.75% of
the control to 1.19%; while the flowering stalks sprayed with 0.14 mg/L of EBR at before-bolting stage had the highest contents
of total phosphorus and potassium, reaching 0.36% and 7.00%, respectively. 【Conclusion】The suitable concentration of EBR
used in flowering Chinese cabbage was 0.01-0.05 mg/L, and the spraying period was better at the seedling stage or at the stages
of both seedling and before-bolting. |
