Effect of PP333 on Growth and Physiological Index in Cucumber Seedling

The effects of paclobutrazol on the seedling of cucumber was studied by seed soaking and spraying to the seedling with different concentration of PP333 in spring. The results showed that PP333 is effective in reducing the emergence rate, height of the seedling and leaf area. But there were no significant differences in biomass accumulation, stem thickness, content of chorophyll and root activity in different stage. Although the treated seedlings were greener than that of control seedling, the biosynthesis of chloroplast pigments was unaffected by PP333. Compared with the spraying, the seed soaking was much better on the uniformity of seedling. The results showed that the optimum concentration of PP333 should be 40 mg/L in spring.