The changes of SOD activity was from descend to ascend during growing in two years with ground control. Relative electrical conductivity ratio and MDA concentration were lower than the control during growing in two years.

• 航天搭载白桦苗木在2年的生长过程中,4个航天搭载家系SOD活性相对于地面对照均先下降后上升,相对电导率和MDA含量最终趋于低于地面对照。