【摘要】 以0,5%,10%,15%,20%的PEG处理臭椿当年生播种苗,测定幼苗主要生理指标的变化,结果表明:随着胁迫程度的增大,臭椿幼苗叶片的相对含水量明显下降,而水分饱和亏缺逐渐升高,叶片失水速度加快,自由水含量降低,叶片保水能力下降,叶绿素含量呈下降;经PEG5%,10%,15%和20%胁迫处理后,叶片质膜相对透性分别是对照的3.14,3.44,3.38,3.98倍,脯氨酸含量分别比对照增加了33.23,42.79,77.65和26.7μg/gFW;渗透胁迫下叶片POD活性明显升高。更多还原

【Abstract】 Several physiological indices of the seedling of Ailanthus altissima were determined after the treatments of different PEG6000 concentration(0,5%,10%,15%,20%).The results showed as the increasing of osmotic stress,the leaf relative water content(RWC),free water content and leaf chlorophyll content reduced obviously,but relative water deficiency(RWD) increased.So the water loss rate increased,but the water holding capacity reduced.Under the treatments of 5%,10%,15% or 20% PEG,leaf cytomembrane relative permeability were as 3.14,3.44,3.38,3.98 times of the CK’s respectively,and proline content increased by 33.23,42.79 77.65,26.7 μg/g respectively compared to CK.The POD activity raised under osmotic stress.更多还原