不同镉水平对菠菜生长及营养元素含量的影响

不同镉水平对两种菠菜澳洲大叶、新世纪全能的生长及营养元素含量影响研究结果表明:培养液中添加镉后能够抑制两种菠菜的生长,可以显著降低菠菜地上部的干重。两种菠菜地上部分及根中的镉含量随培养液中镉浓度增加而显著增加。镉主要累积在菠菜的根中。镉影响菠菜对营养元素的吸收及分配,澳洲大叶地上部的Ca、Mg、Fe和Mn的含量显著增加,新世纪全能地上部Fe含量显著增加。这种影响随着不同元素、不同植株部位及镉离子在介质中浓度的不同而有所差异,基因型间存在一定的差异。

Effects of Different Cadmium Levels on the Growth and Nutrient Elements in Spinach

A hydroponic experiment was carried out to determine the effects of different cadmium(Cd) levels on the gro-wth and nutrient elements in two spinach cultivars: Xinshijiquanneng and Aozhoudaye.The weights of dry shoots were sig-nificantly reduced when they were exposed in cadmium.Cd was easily taken up by the plants and its concentrations in shoots and roots increased with increasing concentrations in the growth medium in both two cultivars.Moreover,cadmium mainly accumulated in the roots.And it also caused some changes in uptake and distribution of nutrients in spinach.Under the influ-ence of cadmium,the concentration of calcium(Ca),magnesium(Mg),iron(Fe),and manganese(Mn) increased in shoot in Aozhoudaye and the concentration of iron(Fe) increased in shoot in Xinshijiquaneng.And the effects of cadmium on the nutrient elements were dependent on the elements,plant tissue,concentrations and genotypes of cadmium.