Dependency between AtMTM1 and AtMTM2 in adapting to a shock of oxidative stress
To check the dependency between AtMTM1 and AtMTM2 in response to oxidative stress, two-week-old seedlings of mtm1-iand mtm2 were treated with 1 to 10 nM MV for a shock of 12 h(Figure 7) .
The expression of AtMTM2 in mtm1-i knock-down mutant was not affected compared with the WT under 1 to 10 nM MV stress(Figure 7A) . However, AtMTM1 expression in mtm2knock-out mutant was significantly up-regulated compared with the WT in adapting to 1 and 5 nM MV stress (Figure 7B) , reflecting redundant AtMTM1 and AtMTM2 genes have different dependency.