Effect of Paclobutrazol on Stress Resistance Physiology of Melon Seedlings Based on Multivariate Analysis
This study analyzed thephysiological resistance effects of paclobutrazol(PP333)on the mel-on seedlings and their interrelationships using multivariate statistical methods.The results indicate that paclobutrazol treatment significantly increased the content of soluble sugar(TSS),soluble protein(sPRO—,ascorbic acid(AsA),proline,total chlorophyll(Chl)and chlorophyll a(Chla).It also sig-nificantly increased the activities of glutathione reductase(GR),peroxidase(POD)and ascorbic acid peroxidase(APX)etc.Malondialdehyde(MDA)was negatively correlated with total potassium(TK,R=-0.78),total nitrogen(TN,R=-0.57),glutathione(GSH,R=-0.89),superoxide dismutase(SOD,R=-0.92),catalase(CAT,R=-0.86),etc.All resistance indexes could be clustered into 2 groups,accounting for 70.59％and 29.41％respectively.There was a positive correlation between in-dicators of the same kind;three common factors could be extracted from 17 physiological indicators,and were respectively named:functional substance metabolism,nutrient metabolism,photosynthesis.They accounted for 74.91％,10.75％and 6.53％of the total information.The corresponding key indi-cators were soluble sugar,phosphorus,chlorophyll b.Thus it can be seen that paclobutrazol can im-prove the stress resistance of melon seedlings.A concentration of 50-150 mg/L is the best treat-ment,which is mainly manifested in the functional effects of functional substance metabolism,nutri-ent metabolism and photosynthesis.Soluble sugar is a decisive indicator for measuring the stress re-sistance of melon seedlings treated with paclobutrazol.
万方数据
维普
