以耐热型品种“农大228”、“082”和热敏感品种“茉莉占”、“协清早B”为材料,研究高温胁迫后不同耐性品种之间的生理差异。结果如下:高温胁迫后,耐热型品种根系质膜ATPase活性升高,热敏感型品种活性降低;耐热型品种根系NH4+吸收速率不受影响,热敏感型品种明显下降。高温胁迫后根系NH4+吸收动力学参数的变化与品种的耐热性无关。 The heat-tolerant varieties “Nongda 228”, “082” and heat-sensitive varieties “Jasmine accounted for”, “Xieqingzao B” as material to study the physiological differences between different tolerance varieties after high temperature stress. The results are as follows: After high temperature stress, the ATPase activity of plasma membrane of heat-tolerant cultivars increased, and the activity of heat-sensitive cultivars decreased. The NH4 + uptake rate of heat-tolerant cultivars was not affected, and the heat-sensitive cultivars decreased significantly. The changes of NH4 + uptake kinetics parameters after high temperature stress were not related to the heat tolerance of cultivars.