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水分胁迫下，２０ｍｇ／Ｌ２，４－Ｄ和４００ｍｇ／Ｌ乙烯利（ＣＥＰＡ）分别不同程度地降低和提高玉米幼叶生长部位的相对含水量（ＲＷＣ）、水势（ψｗ）和渗透调节能力（ＯＡ）。胁迫后期，玉米幼叶中脯氨酸含量（Ｐｒｏ）为：ＣＥＰＡ＞对照（ＣＫｓ）＞２，４－Ｄ。随胁迫的进行，２，４－Ｄ处理幼叶的膜相对透性（ＲＰ）始终处于较高水平且增长幅度较大，叶片延伸生长速率（ＬＥＲ）对ＲＰ的变化较为敏感；而ＣＥＰＡ处理则与此相反。胁迫７２ｈ，２，４－Ｄ和ＣＥＰＡ分别降低和提高玉米幼叶生长部位质膜Ｈ＋－ＡＴＰａｓｅ（ＰＭＨ＋－ＡＴＰａｓｅ）活性，质膜Ｈ＋－ＡＴＰａｓｅ活性与此时的ＬＥＲ呈一定正相关。
Under water stress, the relative water content (RWC), water potential (ψw) and osmotic adjustment capacity (OA) of young leaves were decreased and increased by 20mg / L 2,4-D and 400mg / L ethephon ). The content of proline in the leaves of young corn was: CEPA> CK (CKs)> 2,4-D at the later stage of stress. With the progress of stress, the membrane relative permeability (RP) of young leaves treated with 2,4-D was always at a high level and the growth rate was relatively large, and the leaf elongation growth rate (LER) was more sensitive to the change of RP; while CEPA treatment opposite of this. At 72h of stress, 2,4-D and CEPA decreased and increased the plasma membrane H + -ATPase (PMH + -ATPase) activity of young leaves, respectively. There was a positive correlation between plasma membrane H + -ATPase activity and LER at this time.