多胺对渗透胁迫下玉米幼苗叶片生理生化指标的影响(摘要)(英文)

[目的]探讨多胺增强植物抗旱性的机理,为多胺作为外源生长调节物质在玉米抗旱过程中的应用提供理论基础。[方法]以聚乙二醇(PEG-6000)模拟自然干旱,用外源Spd处理抗旱性不同的2个玉米品种农大108和掖单13,检测渗透胁迫下2个品种幼苗叶片中相对含水量及可溶性蛋白含量的变化。可溶性蛋白含量的测定采用考马斯亮蓝法。[结果]渗透胁迫7d,抗旱性弱的掖单13玉米幼苗叶片的相对含水量和可溶性蛋白含量的下降幅度明显大于抗旱性较强的品种农大108;外源Spd处理明显抑制掖单13在胁迫条件下其幼苗叶片相对含水量的下降,并且提高了其在胁迫条件下可溶性蛋白的含量。可能是因为外源Spd处理,促进其合成了一些特异蛋白,在胁迫条件下发挥其特异功能,以确保水分胁迫下各类物质代谢的适应性变化,增强自身的抗旱性。[结论]外源Spd处理,通过提高渗透胁迫下玉米幼苗叶片内蛋白质的含量,提高了玉米幼苗的抗渗透胁迫能力。

Effects of Polyamine on Leaf Physiological and Biochemical Indexes of Maize Seedlings under Osmotic Stress

[Objective]The research aimed to probe into the mechanism of polyamine enhancing the tolerance of plants to drought stress and provide theoretical basis for application of polyamine in process of maize drought resistance. [Method]With PEG-6000 simulating natural drought,the change in content of soluble protein and relative water content were investigated in seedling leaves of two maize cultivars,Nongda 108 and Yedan 13 under osmotic stress with exogenous Spd treatment. [Result]On the 7th day,leaf relative water content and the content of soluble protein decreased more significantly in leaves of Yedan 13 （drought-sensitive） than in Nongda 108 （drought-tolerant）. Exogenous Spd treatment not only obviously inhibited the decrease of leaf relative water content,but also increased the content of soluble protein. [Conclusion]Exogenous Spd treatment could enhance the tolerance of maize seedlings to osmotic stress,via improving the content of soluble protein in seedling leaves.