用nature期刊的语言风格翻译以下内容成英语：实验结果显示干旱造成2M、5M、7M三个时期丹参植物MDA含量下降下降程度分别为33、37、39

The experimental results demonstrated that drought stress caused a reduction in the MDA content of Salvia miltiorrhiza at three different growth stages, namely 2M, 5M, and 7M. The extent of decrease was 33%, 37%, and 39%, respectively.