PHYSIOLOGICAL RESPONSE OF ZOYSIAGRASS IN URBAN LANDSCAPES TO LOW TEMPERATURE STRESS

Low temperature stress is the primary limiting factor for distribution of zoysiagrass in the transitional regions and temperate regions.
Improving cold tolerance and shortening the yellow period is an urgent problem to be solved in application of zoysiagrass (Zoysia Willd). The LT₅₀ (the temperature at which 50% of stolons died), superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and peroxisome (POD) activities and soluble protein of stolons were determined of ten accessions of Zoysia Willd., after low temperature stress at 8°C/2°C (day/night) for 4 weeks.
The results showed that after low temperature stress, the LT₅₀ declined sharply, range decreased from -2.3°C ~ -10.0°C to -7.2°C ~ -18.4°C, the enzyme activities of SOD, APX and POD all increased, while that of CAT declined.
It was also found that the activity of SOD and APX was significantly negatively correlated with the LT₅₀, and CAT activity was positive related with the LT₅₀. It suggested that low temperature stress induced the increasing of SOD, APX and POD activity and decreasing of CAT activity, and the changes of above four antioxidant activity reduced the oxidation injury and to raise the cold tolerance.

III International Conference on Landscape and Urban Horticulture

Jiping Xuan, Hongxiao Zhang , Zhongren Guo

zoysiagrass, antioxidant system enzyme, buffer-soluble protein, cold stress, freeze tolerance, relationship

https://doi.org/10.17660/ActaHortic.2013.999.36