Abstract:

The cuttings of Parthenocissus quinquefolia were treated with 0～300 mmol·L^-1NaCl. The growth,and some physiological characteristics were investigated after 7 days of treatment. The results showed that plants grew and developed normally in 25 and 50 mmol·L^-1 NaCl. When the concentration of NaCl equal to or more than 100 mmol·L^-1, the growth of treated plants were inhibited, the rates of photosynthesis and transpiration,as well as stomatal conductance were markedly decreased; At the same time,membrane permeability and MDA content markedly increased. It was possible that the concentration of NaCl 100 mmol·L^-1 was the key value of salt stress. Under the salt stress, the contents of soluble sugar,proline, K⁺, Ca²⁺, and Na⁺ increased, especially when the content of NaCl above 100 mmol·L^-1, except proline, the difference of treated plants and control was significant. It was suggested that P. quinquefolia cuttings adjusted the stress of osmotic pressure by increasing the content of soluble sugar and K⁺, Ca²⁺, and Na⁺.

Key words: Parthenocissus quinquefolia, Stress of NaCl, Growth, Physiological characteristics