摘要： 通过电解质渗漏量的变化研究了冬小麦细胞膜的耐热性。耐热性的程度用50℃下热致死时间表示。研究结果表明，小麦幼苗在34℃下锻炼3天可获得最大耐热性。在20℃/15℃（日/夜）生长条件下。耐热品种与热敏感品种之间耐热性无明显差异，它们在50℃下热致死时间为8~26Min。在34℃下锻炼3天后，耐热品种的耐热性明显地高于热敏感品种，耐热品种的50℃热致死时间为87~110min，而热敏感品种为35~55min。

关键词: 小麦, 电解质渗漏, 高温锻炼, 耐热性, 细胞膜热稳定性

Abstract: Heat tolerance of wheat was studied by change of the amount of electrolyte leakage.The degree of heat tolerance was expressed by the heat killing time at 50℃ .Increased heat tolerance reached a peak after acclimation at 34℃ for 3 days.The heat-tolerant and heat-susceptible cultivars of wheat did not differ in killing time when the seedlings were grown at 20℃/15℃ (day/night) condition.Their heat killing times were between 6 to 26 minutes.However the difference became marked after acclimation at 34℃ for 3 days.The heat killing times of heat-tolerant cultivars (87-110 minutes) were dramatically higher than that of heat-susceptible ones (35-53 minutes).

Key words: Wheat, Heat acclimation, Heat tolerance, Membrane thermostability, Electrolyte leakage