本文比较了3个不同品种小麦幼苗在高温胁迫过程中渗透调节物质的变化动态和渗透调节能力的差异,探讨了高温下根冠脱氢酶活性,根冠淀粉粒,光合放氧、呼吸及叶绿体色素降解速率的品种间差别。结果表明,豫麦14在高温下,蒸腾速率适度加强,叶水势较低,叶片含水量下降缓慢,机体水分调节能力强,脯氨酸和微量氨增加量较低,有机酸代谢加强,同时光舍器官受高温损伤小,根冠淀粉水解速度慢,存活率高,表现出较强的渗透调节能力。 In this paper, we compared the dynamic changes of osmotic adjustment substances and osmotic adjustment ability of three wheat cultivars under high temperature stress. The effects of root and root dehydrogenase activity, root starch, photosynthetic oxygen release, respiration and chloroplast Pigment degradation rate differences between varieties. The results showed that transpiration rate of Yumai 14 was moderately increased under high temperature, leaf water potential was low, leaf water content decreased slowly, body water regulation ability was low, proline and trace ammonia content was lower, organic acid metabolism was enhanced, meanwhile light Shelf organ damage by high temperature, root crown starch hydrolysis slow, high survival rate, showing strong ability to osmotic adjustment.