以扬麦５号为试验材料，对小麦生育后期根系的衰老生理进行了初步探讨．试验表明，小麦生育后期根系活性（ＴＴＣ还原力）的变化呈“Ｌ”型的下降趋势，即从孕穗期至开花期，根系活性急剧下降；灌浆至成熟期，根系活性则处于低值水平的相对缓慢的下降趋势．在根系活性急剧下降阶段，根中蔗糖转化酶活性变化与ＴＴＣ还原力下降趋势呈极显著正相关（ｒ＝０．９７５４），因而认为，根系活性急剧下降的原因可能与根中可利用的碳水化合物严重亏缺有关．在生育后期根系活性下降过程中，根中可溶性蛋白质含量和ＳＯＤ活性的变化也与根系ＴＴＣ还原力变化呈显著正相关．剪穗能使根系生理活性增强．ＧＹＢ根叶宝对根系活性有较大的调节作用 Taking Yangmai 5 as test material, the senescence physiology of root system in the late stage of wheat growth was discussed. The results showed that the change of root activity (TTC reducing power) in the late growth stage showed a “L” -type decreasing trend, ie, the activity of root decreased sharply from the booting stage to the flowering stage. At the filling stage to maturity stage, the root activity was at a low level Relatively slow downward trend. There was a significant positive correlation (r = 0.9754) between the changes of sucrose invertase activity and the decreasing trend of TTC in roots during the sharp decline of root activity. Therefore, the reason for the sharp decline in root activity may be related to the available carbon in roots Serious deficiencies of compounds. During the later stage of fertility, the changes of soluble protein content and SOD activity in roots were also significantly and positively correlated with the changes of root restoring ability. Cuttings can make root physiological activity increased. GYB root leaves on the root activity greater regulation