South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China.
Int J Phytoremediation. 2012 Feb;14(2):162-73. doi: 10.1080/15226514.2011.587479.
In a greenhouse pot experiment, we assessed the phytoextraction potential for Cd of three amaranth cultivars (Amaranthus hypochondriacus L. Cvs. K112, R104, and K472) and the effect of application of N, NP, and NPK fertilizer on Cd uptake of the three cultivars from soil contaminated with 5 mg kg(-1) Cd. All three amaranth cultivars had high levels of Cd concentration in their tissues, which ranged from 95.1 to 179.1 mg kg(-1) in leaves, 58.9 to 95.4 mg kg(-1) in stems, and 62.4 to 107.2 mg kg(-1) in roots, resulting in average bioaccumulation factors ranging from 17.7 to 29.7. Application of N, NP, or NPK fertilizers usually increased Cd content in leaves but decreased Cd content in stem and root. Fertilizers of N or NP combined did not substantially increase dry biomass of the 3 cultivars, leading to a limited increment of Cd accumulation. NPK fertilizer greatly increased dry biomass, by a factor of 2.7-3.8, resulting in a large increment of Cd accumulation. Amaranth cultivars (K112, R104, and K472) have great potential in phytoextraction of Cd contaminated soil. They have the merits of high Cd content in tissues, high biomass, easy cultivation and little effect on Cd uptake by fertilization.
在温室盆栽实验中，我们评估了三种苋菜品种（苋属 hypochondriacus L. Cvs. K112、R104 和 K472）对镉的植物提取潜力，以及施加 N、NP 和 NPK 肥料对受 5mgkg(-1)镉污染土壤中三种苋菜品种镉吸收的影响。三种苋菜品种的组织中都含有高水平的镉，叶片中的镉浓度范围为 95.1 至 179.1mgkg(-1)，茎中的镉浓度范围为 58.9 至 95.4mgkg(-1)，根中的镉浓度范围为 62.4 至 107.2mgkg(-1)，导致平均生物累积因子范围为 17.7 至 29.7。施加 N、NP 或 NPK 肥料通常会增加叶片中的镉含量，但会降低茎和根中的镉含量。N 或 NP 复合肥料的施加并没有显著增加 3 种品种的干生物量，导致镉积累的增量有限。NPK 肥料大大增加了干生物量，增加了 2.7-3.8 倍，导致镉积累的大量增加。苋菜品种（K112、R104 和 K472）在受镉污染土壤的植物提取方面具有巨大潜力。它们具有组织中镉含量高、生物量大、易于种植、施肥对镉吸收影响小等优点。
