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渗透胁迫下２０ｍｇ／Ｌ２，４－Ｄ和４００ｍｇ／Ｌ的乙烯利能不同程度地促进或抑制玉米叶片的延伸生长（ＬＥＲ）。随着胁迫程度的加强，２，４－Ｄ处理的ＬＥＲ下降迅速，而乙烯利处理的ＬＥＲ下降较为缓慢；无论是上述２种处理还是对照，玉米叶片生长部位膨压（ψ＿ｐ）、细胞壁屈服阈值（Ｙ）变化不大，而细胞壁的延伸性能（ｍ）则呈明显下降趋势且处理间差异很大。随着叶片生长部位外施重力的增加，ＬＥＲ逐渐升高，但不同处理间的相对生长速率（ＲＥＲ）仍有差异。
Under the osmotic stress, ethephon at 20 mg / L, 4-D and 400 mg / L could promote or inhibit maize leaf elongation growth (LER) to some extent. LER decreased rapidly with 2,4-D treatment and LER decreased with ethephon treatment. With the increase of stress level, the LER of 2,4-D treatment decreased slowly. No matter the above two treatments or the control, the turgor pressure (ψ_p), cell wall yield threshold (Y) did not change much, while the cell wall elongation (m) showed a significant downward trend and the treatment of very different. LER increased gradually with the increase of applied gravitational force at the growth site of leaves, but the relative growth rate (RER) was still different among different treatments.