干旱胁迫和复水对一品红生理特性的影响

以一品红盆花为试验材料，在干旱胁迫条件下，通过测定干旱胁迫及复水条件下两个品种叶片的相对含水量(RWC)、水分饱和亏(WSD)、相对电导率、叶绿素荧光参数、丙二醛（MDA）、过氧化氢（H2O2）等相关生理生化指标变化情况，研究了干旱胁迫和复水对一品红两个品种生理生化指标的影响。结果表明，干旱胁迫引起两个品种的RWC、Fv/Fm 明显下降和相对电导率、MDA、H2O2 、Fo、WSD 含量明显上升；复水后，两个品种的RWC、WSD、Fv/Fm、MDA、H2O2、Fo 等不同程度地恢复，抗旱野金奖冶品种的RWC、WSD、Fo、H2O2恢复到接近胁迫前水平，而原野金奖冶品种的全部生理指标均未能恢复到胁迫前水平。抗旱野金奖冶品种的各项指标与原野金奖冶品种对照相比，在干旱胁迫期间降幅小，复水后各项指标恢复相对明显，表现出较强的耐旱适应能力。

Effect of drought stress and rewatering on physiologicalcharacteristics of Euphorbia pulcherrima Willd

Useing two varieties of poinsettia pot flower (Euphorbia pulcherrima Willd) as test materials, under thecondition of drought stress and rewatering, the physiological characteristics of poinsettia, relative water content (RWC),relative conductivity, the chlorophyll fluorescence parameters and malondialdehyde (MDA) and hydrogen peroxide (H2O2)were measured, and the influence of drought stress was studied. The results showed that the drought stress caused theRWC, Fv/Fm to decrease obviously, and the relative conductivity, MDA, H2O2, Fo content increased obviously; Afterrewatering, RWC, Fv/Fm, MDA, H2O2, Fo recovered in different degrees. The indexes of poinsettia No.1 declined gentlythan No.2 during drought stress, and the drought resisting ability of each index was relatively obvious than variety No.2.