Abstract:

With ‘Longshangxiongying’ as experimental material, effects of different concentration of PP333 on the physiology characteristics in Dahlia pinnata leaves were studied. The Dahlia pinnata was treated with PP333 when the plant height was 30 cm and the physiology characteristics were tested. The results showed that PP333 increased the content of chlorophyll, soluble sugar, soluble protein, proline, decreased the level of MDA, and improve the activity of antioxidant enzymes in Dahlia pinnata leaves. In addition, the effects were better with the increase of concentration. The treatment of 125 mg/L of PP333 had the significant positive effects. Compared with the CK, the content of chlorophyll, soluble sugar, soluble protein, proline were increased 0.75 mg/g, 17.90 mg/g, 22.13 μg/g and 29.92 μg/g, SOD, POD and CAT were improved 1.97, 1.75 and 1.80 times, MDA was decreased 30.70%. The result of study indicated that PP333 could significantly affect the physiological indexes of ‘Longshangxiongying’, improve the content of soluble solids and activity of antioxidant enzymes, promote the growth and development and enhance the resistance.