Primary Research On Salt Tolerance Of Datura Stramonium Of Energy Plants

Datura stramonium is a energy plant with high seed oil content, but there is no report on its salt tolerance. In here, growth and physiological indices of D. stramonium in different salt stress (ECe was 0, 10, 20, 30, 40, 50 and 60 dS m^-1, respectively) were studied, including seed germination, plant growth, chlorophyll content, chlorophyll flurescence parameters, gas exchange parameters and ion content. The mean while we used LSD multiple comparison of SPSS software The main results as follows:(1) D. stramonium could normal germinate, grow and set fruit at the stress conditions of ECe=0～30 dS m^-1, normal germination and growth but no fruit at ECe=40 dS m^-1, and the germination rate is zero at ECe>40 dS m^-1;(2) salt stress significantly inhibited the fresh and dry weight of Datura stramonium, it reduced obviously when ECe≥20 dS m^-1, but there is a certain promotion at ECe=10 dS m^-1;(3) the change of water content of Datura stramonium at different salt stress is not obviously, the results suggests that Datura stramonium could hold the water to enhance its salt tolerance;(4) photosynthetic rate gradually first increased and then decreased in different salt stress, the change was obviously at ECe>20 dS m^-1,(5) the changes of Fo,Fv are increased at low salt stress and then decreased at high salt stress, the change of Fv/Fm is not obviously, the NPQ is dreased while the qP is increased, and this trend is obviously with the extend of treatment time;(6) transpiration rate, stomatal conductance gradually increased in different salt stress, which was obviously at ECe=10 dS m^-1 while not at ECe>10 dS m^-1, LS and intercellular space CO₂ concentration first increased and then decreased.(7) the content of Na⁺ was increased in different salt stress while the content of K⁺ was dressed, and the trends of K⁺ / Na⁺ changes was dressed,These results showed the germination vigor, fresh and dry weight, chlorophyll content, chlorophyll flurescence parameters Fo,Fv,qP,NPQ, gas exchanges of photosynthetic rate, transpiration rate, stomatal conductance and intercellular space CO₂ concentration could be used as the important indices to evaluate salt tolerance of D. stramonium. Our data provides theoretical and scientific basis for the development and utilization of D. stramonium in saline lands.