盐分胁迫对4种花卉种子萌发的影响

Effect of Salt Stress on Germination of Four Kinds of Ornamental Plants

以黑心菊、金鸡菊、翠菊、蜀葵4种花卉种子为材料,研究不同浓度NaCl和Na2SO4复盐溶液处理下种子及幼苗的耐盐性,并观察其相对发芽率、根长、简易活力指数、综合效应。结果表明:耐盐性最强的是金鸡菊,其耐盐半致死浓度和耐盐极限浓度高达1.4%;其次为翠菊,耐盐半致死浓度为0.6%,耐盐极限浓度为1.2%;耐盐力中等的是蜀葵,其耐盐半致死浓度为0.4%,耐盐极限浓度为1.2%;耐盐性最差的是黑心菊,耐盐半致死浓度为0.4%,耐盐极限浓度为1.0%。简易活力指数可以作为种子萌发期间耐盐性的鉴定指标。

Using Rudbeckia hirta , Coreopsis drummondii , Callistephus chinensis , Althaea rosea , four kinds of ornamental plant seeds as the test materials, treated with NaCl and Na2SO4 double salt solutions of different concentrations,and the relative germination percentage, root length, simply vigour index, synthetic inhibitory effect（SE） were measured to determine the effect of salt stress on seed germination. The result showed that the best is Coreopsis drummondii , its semi-lethal concentration and limit concentration both reached as high as 1.4% ;The next was Callistephus chinensis, its semi-lethal concentration was 0.6% , and its limit concentration was 1.2% ;The middle was Althaea rosea , its semi-lethal concentration was 0.4% , and its limit concentration was 1.2% ; The lower one was Rudbeckia hirta ,its semi-lethal concentration was 0.4% ,and its limit concentration was 1.0%. The simply vigour index may be used to assess the level of the seed salt tolerance.