Cd及矿质营养元素在结缕草植株中的积累特性

以水培方法研究了镉在结缕草中的积累特性及对矿质元素含量的影响。结果表明:Cd²⁺处理下结缕草根、叶中镉的分布比例为细胞壁>胞液>细胞器。低浓度(1、10 mg·L^-1)处理下,结缕草茎细胞液中镉的比例分别较细胞壁中镉的比例高出61.70%、69.60%;高浓度(100 mg·L^-1)处理下,细胞壁中镉的比例较细胞液中镉的比例高出47.70%。低浓度(1、10 mg·L^-1)处理的结缕草地下部的镉含量显著高于地上部,而高浓度下(100 mg·L^-1)结缕草地上部的镉含量较地下部显著提高37.31%;随着处理浓度的升高,镉转运系数显著提高,100 mg·L^-1处理下镉转运系数分别较1、10 mg·L^-1提高了4.12、2.45倍。高浓度(100 mg·L^-1)处理下,结缕草地下部N、K、Ca、Mg含量下降,P、S含量有所提高。高浓度(100 mg·L^-1)镉处理下,地上部N含量较对照显著上升16.11%,Ca、Mg的含量均较对照升高;不同浓度镉处理的地上部P、K、S含量均较对照降低。

The Accumulation Characteristics of Cd and Mineral Nutrition Element in Zoysia japonica under Cd2+ Treatment

The accumulation characteristics of Cd and the effects of Cd²⁺ on mineral metabolism in Zoysia japonica were studied by hydroponic culture. In the leaves and roots, the proportion of Cd in cell wall was higher than that in cytosol, and the proportion of Cd in organelle was the lowest. Whereas in the stem of Z. japonica, the proportion of Cd in cytosol was higher than that in cell wall when the concentration of Cd²⁺ was low (1 mg·L^-1 and 10 mg·L^-1), the case was opposite when the concentration of Cd²⁺ reached 100 mg·L^-1. The concentration of Cd in underground was significantly higher than that in aboveground when the concentration of Cd²⁺ was low (1 mg·L^-1 and 10 mg·L^-1). However, when the concentration reached 100 mg·L^-1, the concentration of Cd in aboveground was significantly increased by 37.31% compared with that in underground, and the transferring index was significantly increased by 4.12 and 2.45 times compared with 1 mg·L^-1 and 10 mg·L^-1. In underground part, the N, K, Ca and Mg contents decreased, while the P and S contents increased. In aboveground part, the contents of P, K and S decreased, and the contents of N, Ca and Mg increased.