Effect of mycorrhizal colonization on growth, Cd and Mn uptaken by Trifolium alexandrinum L

摘要

In this study, Cd at concentrations of 0, 1.5, 3.0, 10 and Mn at concentrations of 0 and 100 mg·kg<'1> soil were added to a ster-ilized soil. Five two-day old seedlings were transplanted into each pot and inoculated with Glomus intraradices. The results showed that shoot and root dry weights of mycorrhizal plants were significantly greater than those of non-mycorrhizal clover plants at all levels of Cd and Mn concentrations. The concentration of Cd in both mycorrhizal and non-mycorrhizal clover plants significantly increased as Cd applied to soil was increased. However, the concentration of Cd in both root and shoot of mycorrhi- zal plants was significantly lower than that in non mycorrhizal plants. A similar trend to that of Cd was observed for Mn. This was mainly attributed to the sequestration of the heavy metals hy fungal structure and might be regarded as a mechanism facilita- ting exclusion of metals from the shoot, and thus avoiding metal toxicity.