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耐热性强弱不同的大白菜品种在细胞膜热稳定性上存在明显差异。经２８～３８℃的短期（１天）高温锻炼能提高细胞膜热稳定性，而常温的脱锻炼又能使细胞膜热稳定性发生可逆变化。持续１０天３２和３６℃的高温处理在提高细胞膜热稳定性的同时，也使植株产生明显的热害症状，耐热性弱的品种比耐热性强的品种更为严重、对保护酶系统酶活性的研究表明：高温导致过氧化物酶（ＰＯＤ）活性降低、过氧化氢酶（ＣＡＴ）活性升高，耐热性强的品种ＰＯＤ活性高于耐热性弱的品种，且超氧化物歧化酶（ＳＯＤ）活性在高温下也较为稳定。
There are obvious differences in thermal stability of Chinese cabbage cultivars with different heat resistance. After 28 ~ 38 ℃ short-term (1 day) high temperature exercise can improve cell membrane thermal stability, and room temperature de-exercise can also make the cell membrane reversible change in thermal stability. Continuous 10 days 32 and 36 ℃ high temperature treatment in improving cell membrane thermal stability, but also make plants produce significant symptoms of heat, heat-resistant varieties are more severe than the heat-resistant varieties, the protective enzyme system The results showed that the activity of POD decreased, the activity of catalase (CAT) increased, the activity of POD was higher than that of the heat-resistant ones under high temperature, and the activity of superoxide Dismutase (SOD) activity is also more stable at high temperatures.