干旱胁迫下八棱海棠中丙二醛及质膜透性的变化

Changes of the Relative Conductivity and MDA in Malus robusta Rehd Under Drought Stress

以盆栽八棱海棠幼苗为试材,保持45%～50%土壤含水量进行中度干旱处理,研究干旱胁迫过程中丙二醛和质膜透性的动态变化与八棱海棠的抗旱关系。结果表明:八棱海棠在中等干旱胁迫下,叶片的质膜透性和丙二醛含量均随干旱胁迫时间的延长而增大,但质膜透性在前4d增加较慢,第5天开始明显增加;而丙二醛在前5d增加较慢,5d后增加较大。前期还能抵抗一定的干旱胁迫的强度,当超过一定强度时,细胞大量坏死,植物受到严重伤害甚至死亡。

Taking Malus robusta Rehd seedling as material,treated in potted cultural condition under 45%~50% moderate water stress,the relationship between the resistant drought ability and changes traits of the relative conductivity and MDA were studied.The results showed that the relative conductivity and MDA increased constantly with water stress getting longer and longer,however,the relative conductivity changed slowly in the first 4 days,and 5 days started to increased significantly;MDA changed slowly in the first 5 days,and 5 days later started to increased significantly.At the beginning,Malus robusta Rehd seedling was able to resist a certain extent drought stress,when more than a certain intensity,a large number of cells died,plant suffered severe damage and death.