用nature期刊的语言风格将以下内容写成英语：只有7m植物在受到干旱胁迫时apx酶活性与对照组比较显著性提高2m和5m提高幅度均不显著。
The activity of apx enzyme in 7m plants showed a significant increase compared to the control group under drought stress, while the increase in 2m and 5m was not significant.
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