中文摘要：

本文研究了硒的价态（Se6＋和Se4＋）和浓度水平（0～100mgSe·L-1）对6种植物（大麦、小麦、花椰菜、萝卜、苜蓿和欧芹）种子萌发和根际生长特性的影响。结果表明,低浓度硒（〈1mgSe·L-1）对种子发芽促进作用不明显,而高浓度硒（〉4mgSe·L-1）则有显著抑制作用,不同种子对硒的抗性表现不同。根长和芽长的测定结果表明,低浓度对花椰菜和小麦种子生长具有显著促进作用,对欧芹种子表现出抑制作用。较高浓度（1～4mg·L-1）即对花椰菜、苜蓿和欧芹的根生长表现出抑制作用,高浓度对小麦、大麦和萝卜根生长有抑制作用,且使芽生长受到抑制的硒浓度高于根生长。比较价态,低硒时六价对花椰菜生长的促进作用显著高于四价,高硒时小麦和苜蓿对硒的抗性表现为六价硒强于四价硒,其余科属差异不显著。不同科属对硒的抗性为禾本科小麦和大麦最强,十字花科花椰菜和萝卜次之,豆科苜蓿较差,伞形科欧芹最差。

英文摘要：

Effects of selenium on seeds germination and root growth were studied by culture experiment with 6 species under different Se valence states（Se6＋ and Se4＋） and concentrations（0～100 mgSe·L-1）.The results showed that the significant inhibition effect can be found at high Se concentration,germination resistance to Se for the crop species sequence was：barley and broccoliwheatradish and medicparsley.Results of root and shoot length showed that the seed growth of broccoli and wheat was improved below 1 mgSe·L-1 while parsley was inhibited.The inhibition effects on root growth were found when Se concentration was higher than 2 mgSe·L-1 for broccoli,medic and parsley,and higher than 4 mgSe·L-1 for wheat,barley and radish.The inhibiting Se concentrations for shoot growth were found higher than that for root growth,at the same time.Selenate showed more obvious improvement effect on broccoli growth than selenite at low concentration.Wheat and medic had higher resistance to Se with selenate than with selenite at high Se concentration,while other species did not show significant difference.The species sequence of root growth resistance to Se was：wheat and barley（gramineous） was the best,followed by broccoli and radish（cruciferous）,and then was medic（leguminous）,parsley（umbelliferous） was the worst.