盐分胁迫对不同番茄品种生理生化指标的影响

在无土栽培条件下,以1/2MS营养液及含NaCl浓度分别为50、100、200、400mM的营养液对3个番茄品种“红润156”、“早冠二号”和“黄圣女”处理一周,研究盐胁迫对番茄幼苗叶片的影响.结果显示：随盐分浓度的增加,植株伤害加重.番茄叶片细胞膜透性增大,丙二醛（MDA）含量,过氧化物酶活性先升高后降低,脯氨酸含量明显增加,叶绿素含量下降.但各指标的变化程度因番茄品种不同而异.在盐胁迫下,“黄圣女”的脯氨酸含量、过氧化物酶活性,叶绿素含量都明显高于另外两品种,“早冠二号”最低.细胞膜透性和丙二醛（MDA）含量则是“早冠二号”最高,“红润156”居中,“黄圣女”最低.

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 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.