不同预处理对滨藜种子在逆境中萌发的影响

Influence of Different Pretreatments on Germination in Adversity of Atriplex L.Seeds

在实验室和温室内对3种滨藜属植物种子进行蒸馏水、0.4%、0.8%、1.2%的NaCl溶液和10%、15%、20%的PEG溶液引发预处理以及低温预处理(5℃),测定不同预处理方式对种子在干旱胁迫和盐胁迫(NaCl)中发芽率/出苗率和种子胚生长的影响。结果表明:实验室发芽实验中,不同方式预处理整体上并没有显著提高3种滨藜种子的萌发能力,同时引发效果因植物种、预处理方式以及发芽环境而异,表现出较差的规律性;温室盆栽实验中,不同方式的预处理较为明显地提高了灰白滨藜变种2和四翅滨藜的出苗率,但也降低了灰白滨藜变种1的出苗率。总的来看,不同方式种子预处理在一定程度上"打乱"了种子在不同胁迫强度下的萌发能力。

Many Atriplex L. seeds are difficult to germinating. To seek for effective methods to improving their germinating ability,we pretreated three Atriplex L. seeds by using distilled water,0.4% ,0.8% and 1.2% NaC1 solution, 10% , 15 % and 20% PEG solution and low temperature （5 ℃ ） and determined germination percentage/ seedling emergence and embryo development under drought stress and salt stress （NaC1） , the results showed that： in laboratory germination test, pretreatments above did not enhance the seeds germinating ability significantly in whole, meanwhile, the effects of pretreatments were different depend on the kinds of plants, pretreated ways and germination environments, and represented inconspicuous regularity; in greenhouse test, seedling emergences are significantly enhanced by pretreatments on A. canescens ssp. canescens var. laciniata Parish and A. canescens （Pursh） Nutt. , but is decreased on A. canescens ssp. aptera. In sum, different kinds of pretreatments disturbed germinating ability in adversity a certain extent.