Effects of Hyper-gravity on Physiological and Biochemical Indices of Tomato Seedlings

Taking tomato(Lycopersicon esculentum Mill) seeds as plant material,this experiment determined the seed germination rate and index,chlorophyll content,root activity,catalase activity(CAT),peroxidase activity(POD),malondialdehyde(MDA) and proline content,and compared the results with those of the control,after they were treated with 1 000×g,1 500×g,2 000×g for 1,2,3 hours.The results showed that both germination rate and germination index decreased after hyper-gravity treatment,while the root activity,CAT and POD all rose,but the MDA content decreased.And the chlorophyll content increased after tomato leaf blades were treated with 1 000×g,1 500×g for 1 hour and 1500×g for 2 hours.The free proline content of tomato seedlings increased,except they were treatment with 2 000×g for 3 hours.The above results indicated that different hyper-gravity treatments could enhance stress resistance of tomato seedling.