以郑单958和先玉335为试验材料，设置3个不同浓度乙烯利处理，研究乙烯利对玉米茎秆形态、穿刺强度、木质素含量及相关合成酶活性的影响以及与抗倒伏能力的关系。结果表明，乙烯利处理抑制了玉米株高、穗位高、节间长和产量，提高了茎秆抗折力、穿刺强度、木质素含量及PAL、CAD、4CL活性和抗倒伏指数。玉米茎秆木质素含量与抗折力呈极显著正相关（r=0.930，P<0.01），在200 mg/L乙烯利处理下，PAL、CAD、4CL活性与抗倒伏指数呈极显著正相关。PAL、CAD、4CL活性是提高玉米抗倒伏能力的酶学基础，有利于提高茎秆强度，进而增强其抗倒伏能力。

Using Zhengdan958 and Xianyu335 as the experimental materials, three different concentrations of ethephon were set up to study the effects of ethephon on shape of maize stalk, puncture strength, lignin content and related enzyme activities and the relationship with lodging resistance. The results showed that ethephon treatment inhibited plant height, ear height, internode length and yield, and increased the snapping resistance, stalk rind penetration strength, lignin content and PAL, CAD, 4CL activity and resistance lodging index. The lignin content of maize stalk was positively correlated with snapping resistance(r=0.930, P<0.01), and the PAL, CAD, 4CL activity was positively correlated with the resistance to index under 200 mg/L ethephon. PAL, CAD and 4CL activity is the enzymology basis of improving the lodging resistance of maize, which is conducive to improve the stem strength, and enhance its ability to resist lodging.

国家自然科学基金（31501251）、农业部农业科研杰出人才及创新团队项目（2015）