The cadmium tolerance capacity of Canna orchioides was evaluated using glasshouse experiment to lay a theoretical foundation to broad applications of this species in cadmium (Cd) polluted areas. The plant growth, Cd absorption, and antioxidative enzyme activities of canna plants treated with different Cd concentrations (0, 100, and 200 mg · kg⁻¹ per dry soil) for 30 days were investigated. The results indicated that the growth of roots, leaves and stems was restricted following Cd addition. The bio-concentration factor was the highest in the roots, followed by the leaves, rhizomes, and stems. Compared with the control, the translocation factor decreased sharply after 100 mg · kg⁻¹ or 200 mg · kg⁻¹ Cd treatment, whereas the tolerance index decreased significantly under 200 mg · kg⁻¹ Cd exposure. The Cd accumulation rate and total Cd accumulation significantly increased under 200 mg · kg⁻¹ Cd treatment than the control. The malondialdehyde content remained unchanged at different Cd concentrations, while the relative electrical conductivity of the root increased significantly following 200 mg · kg⁻¹ Cd treatment. Cd stress increased significantly the activity of superoxide dismutase (SOD), peroxidase (POD), and ascorbate peroxidase (APX) in the leaves, whereas only SOD was raised in the roots. The catalase (CAT) and POD activity in the roots did not differ significantly at different Cd concentrations. Conversely, APX in the roots decreased significantly under Cd stress, which suggests that the protective mechanisms in the leaves differ from those in the roots. These results indicated that C. orchioides has a high tolerance for Cd. Furthermore, the reactive oxygen species caused by Cd stress could be effectively scavenged by the antioxidative system. The present study proved that C. orchioides constitutes a promising ornamental plant for use in the restoration of areas contaminated with Cd.

利用温室试验评估了Canna orchioides对镉的耐受能力，为该物种在镉（Cd）污染地区的广泛应用奠定了理论基础。研究了用不同Cd浓度（每干土0、100和200 mg·kg ^-1）处理30天的美人蕉植物的生长，Cd吸收和抗氧化酶活性。结果表明，添加镉后，根，叶和茎的生长受到限制。生物富集因子在根中最高，其次是叶，根茎和茎。与对照组相比，在100 mg·kg ^-1或200 mg·kg ^-1后，易位因子急剧下降镉处理，而在200 mg·kg ^-1镉暴露下，耐受指数显着下降。在200 mg·kg ^-1 Cd处理下，Cd积累速率和总Cd积累量均显着高于对照。在200 Cd·kg ^-1后，丙二醛含量在不同的Cd浓度下保持不变，而根的相对电导率显着增加。镉处理。镉胁迫显着增加了叶片中的超氧化物歧化酶（SOD），过氧化物酶（POD）和抗坏血酸过氧化物酶（APX）的活性，而根部只有SOD升高。在不同的镉浓度下，根中的过氧化氢酶（CAT）和POD活性无明显差异。相反，在镉胁迫下，根部的APX明显降低，这表明叶片中的保护机制不同于根部中的保护机制。这些结果表明，兰花拟南芥对镉具有很高的耐受性。此外，可以通过抗氧化系统有效清除Cd应力引起的活性氧。本研究证明了兰花C 构成一种有前途的观赏植物，可用于恢复受镉污染的区域。