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作 者 ：史薇*,徐海量,赵新风,凌红波,李媛

期 刊 ：生态学报 2010年 30卷 8期 页码：2112~2117

关键词：胀果甘草；种子萌发；干旱胁迫；

Keywords:Glycyrrhiza inflata, seed germination, drought stress,

摘 要 ：为探讨胀果甘草种子萌发对干旱胁迫的生理生化适应机制，以聚乙二醇(PEG)-6000模拟干旱胁迫，分析了胀果甘草(Glycyrrhiza inflata)种子萌发过程中发芽率(GR)、丙二醛(MDA)及游离脯氨酸(Pro)、可溶性糖(SS)含量和超氧化物歧化酶(SOD)、过氧化物酶(POD)活性的动态变化规律。结果显示，水势为-0.1MPa时，GR达到100%，之后随着干旱胁迫增强而显著降低(P<0.05)；MDA、Pro含量及SOD、POD活性都表现出水势≥-0.2MPa时增加和-1.4MPa≤水势<-0.2MPa时减少的明显趋势(P<0.05)，这4个指标两两之间的相关关系均达到显著水平(P<0.05)；而干旱胁迫增强使SS含量显著增加(P<0.05)。

Abstract:Dynamics of germination rate (GR), malondialdehyde (MDA), free proline (Pro), soluble sugar (SS), superoxide dismutase (SOD) and peroxidase (POD) were analyzed during seed germination of Glycyrrhiza inflata under drought stress simulated by polyethylene glycol (PEG)-6000. The Results showed that, GR was 100% under -0.1MPa of water potential then decreased when the drought stress intensified; MDA, Pro, SOD and POD increased when water potential≥-0.2MPa but then decreased when -1.4MPa ≤ water potential < -0.2MPa (P<0.05). The correlations among the aforementioned four indexes were significant (P<0.05), while the drought stress increased SS significantly at P<0.05.

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