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两个小麦品种叶片渗透调节能力随土壤缓慢脱水而增加，昌乐５号约为０．２９ＭＰａ，鲁麦５号约为０．１９ＭＰａ。随着土壤脱水的加剧，光合作用受抑制的原因有一个从气孔限制向叶肉细胞光合活性限制的转变过程。渗透调节对干旱条件下光合作用的维持和供水后光合作用的恢复都有一定的贡献。用改良法测定两二醇含量，结果表明，抗旱品种昌乐５号的丙二醇含量没有增加，这与其内源保护酶（ＳＯＤ）活性在严重干旱条件下较高有关。相反，鲁麦５号在严重干旱条件下由于其ＳＯＤ酶活性下降，丙二醇含量显著高于对照，表明发生了膜脂过氧化。
The osmotic adjustment ability of leaves of two wheat varieties increased with the slow dehydration of soil, Changle 5 was 0.29MPa, and Lumai 5 was 0.19MPa. As soil dehydration aggravates, the reason for the inhibition of photosynthesis is a shift from stomatal limitation to limitation of photosynthetic activity to mesophyll cells. Osmotic adjustment has a certain contribution to the maintenance of photosynthesis under drought and the recovery of photosynthesis after water supply. The results showed that the content of propylene glycol in drought-tolerant cultivar Changle No.5 was not increased, which was related to the activity of its endogenous protective enzyme (SOD) under severe drought conditions. In contrast, Lumai 5 suffered from decreased SOD activity and a significantly higher propylene glycol content under severe drought conditions, indicating membrane lipid peroxidation.