四翅滨藜抗旱生理特性研究

通过盆栽控水和聚乙二醇(PEG)渗透胁迫(PEG渗透势为0%,5%,10%,15%,20%)试验,测定四翅滨藜幼苗叶的保水力、相对含水量、水分饱和亏、相对电导度、叶绿素含量、MDA含量、光合生理指标等,对四翅滨藜幼苗的抗旱生理特性进行研究。结果表明:盆栽控水6d土壤含水量(质量分数)下降为8.3%时,对其幼苗的光合生理指标没有明显影响;在渗透胁迫下,四翅滨藜幼苗叶相对含水量、叶绿素含量、自由水含量等呈下降趋势;水分饱和亏、相对电导度、MDA含量、束缚水含量等呈上升趋势;在严重胁迫(PEG渗透15%,20%)下,这些生理指标的变幅较大。四翅滨藜幼苗叶保水能力强,束缚水含量较高,抗旱性强。

Physiological Property in Drought Resistance of Atriplex canescens

Based on the experiment with two comparative methods,the water controlable pot planting and the PEG penetration stressing(0%,5%,10%,15%,20%),the water holding capacity of the leaf,relative water content,relative water deficit,relative electrical conductance,chlorophyll,MDA content as well as the photosynthetic physiological index were measured and the physiological property in drought resistance of Atriplex canescens was studied.The experiment results show that under water controllable pot planting for 6 days,the soil moisture decreased to 8.3% and did not affect the photosynthetic physioogical index very much.Under the water penetration stress conditions,the relative water content of the leaf,chlorophyll and the free water content of A.canescens seedling decreased while the relative water deficit,relative electrical conductance,MDA content and bound water content increased.Under the condition of serious water penetration stressing (15%,20% PEG),the above-mentioned physiological indices changed to a reatively large extent.The water holding capacity of the leaf of A.canescens is strong and its bound water content is higher and its drought resistance is strong.