Effects of Zinc and Molybdenum Nutritions on Yields, Polyamines, Hormone Contents and Active Oxygen Metabolism in Leaves of Balsam Pear （Momordica charantia cv. Zhuzhou Changbai）

Abstract:

Spraying ZnSO₄·7H₂O and Na₂MoO₃·2H₂O on the leaves of balsam pear (Momordica charantia cv. Zhuzhou Changbai) grown in the field could significantly increase the yield of balsam pear and the contents of polyamines (PAs), putrescine (Put), spermidine (Spd), spermine (Spm), indole acetic acid (IAA), gibberellic acid (GA₃) and ascorbic acid (ASA) and the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) in the leaves. It also reduced malondialdehyde (MDA), abscisic acid (ABA) content and autoxidation rate (AOR)in leaves，which inhibited membrane lipid peroxidation and retarded the senescence of leaves．The statistics analysis showed a significant positive correlation between yields and IAA，GA₃，PAs，SOD，POD，CAT， but a significant negative corelation between yields and MDA，AOR,ABA．Whereas in the leaves，the content of MDA was positively related to the contents of ABA and AOR，but negatively to those of PAs，IAA ，GA₃，SOD，POD and CAT．