Influences of boron and molybdenum on active oxygen species in turfgrass seashore Paspalum vaginatum under low temperature

Metabolism of active oxygen species (AOS) in Seashore paspalum (Paspalum vaginatum Swartz.) with or without boron and molybdenum (-BMo, +BMo) were studied with solution culture under low and mild temperature for understanding the possible roles of boron and molybdenum in enhancing the chilling resistance of turfgrass. The results showed that the activities of superoxide dismutase (SOD) and catalase (CAT) were significantly (P0.01) increased, the activity of peroxidase (POD) was significantly (P0.01) decreased, the rate of active oxygen species (O~(-·)_2)(P0.01) and membrane permeability were significantly(P0.05) decreased, and the content of malondialdehyde (MDA) was trended towards decrease by the application of B and Mo under low temperature. The activity of SOD,POD and CAT decreased significantly (P0.05), while O~(-·)_2 producing rate and malondialdehyde (MDA) content increased significantly (P0.01), and membrane permeability increased under low temperature, suggesting that the turfgrass was subjected to chilling stress. Thus it indicates that boron and molybdenum could enhance the chilling resistance of turfgrass by protecting the plant from the injury of AOS via increasing activities of scavenging enzymes.