PEG模拟干旱胁迫对光叶珙桐幼苗叶片含水量和蛋白质含量的影响

Effects of Drought Stress with PEG on Water contant and Protein Content of Davidia involucrata var. vilmoriniana Seedlings Leaves

[目的]研究干旱胁迫条件下光叶珙桐叶片含水量和蛋白质含量的变化。[方法]采用PEG模拟干旱胁迫,分析光叶珙桐幼苗叶片含水量、蛋白质含量变化。[结果]光叶珙桐幼苗在耐受范围内短时间对干旱胁迫的低水平变化并不十分敏感,但对于短时间的高强度干旱胁迫和长时间的低强度干旱胁迫的耐受力明显下降,在干旱胁迫条件下可以通过应激反应加强叶片的代谢,以合成更多的蛋白质抵御干旱威胁,但随着胁迫强度的增加,植物叶片蛋白质合成能力逐渐降低。[结论]该研究为更好地分析光叶珙桐的抗旱性提供理论依据。

[Objective] To study the changes of water content and protein content in Davidia involucrata var. vilmoriniana seedlings leaves under drought stress.[Method] Using PEG to simulate drought stress ,effects of drought stress with PEG on the moisture and protein content of D.involucrata seedlings leaves were studied. [Result]The change of low level vilmoriniana seedlings in the tolerance range of the short time of drought stress was not very sensitive.But for short time and high intensity drought stress and long time and low intensity drought stress,the tolerance of leaves decreased significantly. Under drought stress,stress could enhance the metabolism of leaves to synthesize more protein to resist drought threat. With the increase of stress intensity,the protein synthesis ability of plant leaves gradually decreased.[Conclusion]The study provides a theoretical basis for the better analysis of the drought resistance of D.involucrata .