干旱胁迫对木本滨藜生理特性的影响

以2年生的努塌滨藜、三角滨藜、四翅滨藜、沙棘为试材,研究干旱胁迫条件下木本滨藜生理特性的影响。结果表明:1)3种木本滨藜植物通过维持较高的束缚水含量来增加保水能力,沙棘束缚水含量及保水能力远低于木本滨藜。2)干旱胁迫条件下努塌滨藜、三角滨藜细胞膜受氧化程度较小,四翅滨藜在重度干旱条件下MDA含量比对照增加了19.3%,细胞膜受氧化程度较大;3种滨藜植物在干旱胁迫下,膜透性没有明显升高,细胞膜结构与功能完好,而沙棘在中度干旱胁迫下MDA含量比对照增加了20.68%,严重干旱胁迫时增加24.34%,且与对照有显著性差异,细胞膜受严重氧化,造成细胞透性在中度、重度干旱胁迫下较正常水分条件下分别增大37.38%和41.58%,细胞膜系统受到较为严重伤害。3)干旱胁迫对滨藜植物光合色素合成影响不明显,而沙棘在严重干旱条件下Chla降低了27.76%(P<0.05),Chlb降低44.18%(P<0.01),叶绿素合成受到抑制。4)根据Farquhar等提出的气孔限制值分析观点判断,除了中度干旱胁迫下三角滨藜Pn下降可能是非气孔限制因素造成以外,其他Pn下降可能是气孔关闭造成。5)利用隶属函数对4种植物抗旱能力评价由高到...

Effects of Drought Stress on Physiological Characteristics of Woody Saltbush

Three two-year-old woody saltbushes (Atriplex gardneri,A.tridentata,A.canescens) and Hippophae rhamnoides were used to study effects of drought stress on physiological characteristics of woody saltbush.Three levels of soil moisture were used as the following:control (CK),moderate water stress (T_1),and severe water stress (T_2),and the soil moisture was controlled by weighing teh pots.The results showed that:1) the water holding capacity of three kinds of woody saltbush was far higher than H.rhamnoides,beca...