Effects of Salt Stress on Physiological-biochemistry Index of Different Tomato Seedling

Under the soilless culture,three tomato varieties with different salt tolerance were treated by appling(0,50,100, 200,400mM)NaCl solutions for one week.Effects of salt stress on the tomato seedling were studied.The result showed that the injured degree of tomato seedling raised as increasing of NaCl stress level.The plasma membrance permeability were increased,the contem of MDA raised first,declined then,POD activities raised,the content of Proline increased,and the content of chlorophyll decressed.But the varieties level of indexes in the three seedling were different,the content of MDA,POD,Proline,chlorophyll in leaves ofHuang sheng nvwere the most than those of other two tomato varieties,Zao guan No.2was the least.The content of MDA and POD in leaves ofZao guan No.2was the highest,the second wasHuang run No.156,andHuang sheng nvwas the last.