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通过测定耐热性不同的３个大白菜品种在高温胁迫下发生的水分和蛋白质代谢的变化，表明耐热的亚蔬１号比不耐热的“１０６”品种叶细胞具有更高的含水量和束缚水、较大的气孔密度和蒸腾速率、较低的蛋白质降解速率，较耐热的华湘１号的各项生理指标均居于中间水平．高温使细胞膜透性稍有增大，耐热与不耐热品种膜透性增大可能有不同机理．高温胁迫使耐热品种脯氨酸含量迅速增多，脯氨酸可作为大白菜耐热性鉴定的生化指标
The changes of water and protein metabolism of three Chinese cabbage varieties with different heat tolerances under high temperature stress indicated that the heat tolerant Yasushi No.1 had a higher water content than the leaf cells of the heat-sensitive “106” And irreducible water, larger stomatal density and transpiration rate, lower protein degradation rate, all the physiological indexes of Huaxiang 1, which are more tolerant to heat, all lived in the middle level. High temperature makes the cell membrane permeability slightly increased, heat-resistant and heat-resistant varieties of membrane permeability may have different mechanisms. The proline content of heat tolerant cultivars increased rapidly under high temperature stress, and proline could be used as the biochemical indicator of heat tolerance of Chinese cabbage