Effects of Exogenous ZnSO4 on the Growth and Physiological Characteristics of Ligustrum Obtusifolium after Pruning
In an urban landscaping environment,5 treatments were set up to study the effects of different ZnSO4 concentra-tions on the new shoots growth and physiological characteristics of Ligustrum obtusifolium after pruning.The results showed that foliar spraying of ZnSO4 promoted the growth of new shoots of Ligustrum obtusifolium after pruning and increased their chlorophyll content compared to the control.Throughout the entire experimental period,the shoots length of Ligustrum ob-tusifolium was significantly higher than that of the control when the concentration of ZnSO4 was 0.45%~0.60%,and the chlorophyll content of Ligustrum obtusifolium was significantly higher than that of the control when the concentration of Zn-SO4 was 0.45%.The NR activity and tryptophan synthase activity of Ligustrum obtusifolium increased with the increase of ZnS04 concentration from June to August,and first increased and then decreased with the increase of ZnS04 concentration in September which reached the highest value when the ZnSO4 concentration was 0.45%.The GS activity and GOT activity increased with the increase of ZnSO4 concentration from June to July,and first increased and then decreased with the in-crease of ZnSO4 concentration from August to September which reached the highest value when the ZnSO4 concentration was 0.45%.Comprehensive analysis suggested that 0.45%was an appropriate concentration of ZnSO4 to promote the growth of new shoots and improve physiological characteristics of Ligustrum obtusifolium after pruning.