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

YU Shuang LI Chun-yan (Mudanjiang Teachers College,Heilongjiang 157012)  
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 of"Huang sheng nv"were the most than those of other two tomato varieties,"Zao guan No.2"was the least.The content of MDA and POD in leaves of"Zao guan No.2"was the highest,the second was"Huang run No.156",and"Huang sheng nv"was the last.
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