3种柽柳属植物种子萌发特性研究

Study on Seed Germination Characteristics of 3 Species of Tamarix

[目的]研究3种柽柳属植物种子萌发特性。[方法]以多枝柽柳、中国柽柳和细穗柽柳为研究对象,用沙床室温试验模拟自然环境,研究不同温度胁迫、不同浓度NaCl盐胁迫、不同浓度聚乙二醇(PEG-6000)干旱胁迫下3种柽柳属植物的种子萌发特性。[结果]在15、20、25、30、35℃下,多枝柽柳和中国柽柳在25℃时萌发率最高,分别可达84.00%、97.34%;细穗柽柳在20℃萌发率最高,为71.34%;NaCl溶液对种子萌发均有抑制作用;在干旱胁迫下,PEG浓度小于45%时对多枝柽柳种子萌发有促进作用,对中国柽柳有抑制作用,PEG浓度小于30%时对细穗柽柳种子萌发有促进作用。[结论]该研究可为扩大柽柳属植物资源提供科学依据。

[ Objective ] To study the seed germination characteristics of 3 species of Tamarix. [ Method ] Taking Tamarix ramosissima, Tamarix chinensis, Tamarix leptostachys as research object, simulation of natural environment with sand bed room temperature test, the characteristics of seed germination of 3 species of Tamarix under different temperature stress, different concentrations of NaC1 salt stress and different concentrations of polyethylene glycol （PEG-6000） of drought stress was studied. [Result] At 15,20,25,30,35 ~C, the germination rate of Tamarix ramosis- sima and Tamarix chinensis reached highest at 25 ~C, which were 84.00%, 97.34%, respectively. The germination rate of Tamarix leptostachys was highest at 20 ~C, which was about 71.34%. In the PEG environment, the PEG concentration less than 45% can promote seed germination of Tamarix ramosissima and inhibit seed germination of Tamarix chinensis. The PEG concentration less than 30% can promote seed germination of Tamarix leptostachys. [ Conclusion] The study can provide scientific basis for expanding the resources of Tamarix.