Wei Shuhe, Zhou Qixing, Xiao Hong, Yang Chuanjie, Hu Yahu, Ren Liping
Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, People's Republic of China.
Environ Monit Assess. 2009 May;152(1-4):299-307. doi: 10.1007/s10661-008-0316-4. Epub 2008 May 16.
The screening of hyperaccumulators is still very much needed for phytoremediation. With properties such as strong tolerance to adverse environment, fast growing and highly reproductive rate, weed species may be an ideal plant for phytoremediation. The objectives of this study were to examine the tolerance and hyperaccumulative characteristics of 24 species in 9 families to Cd, Pb, Cu and Zn by using the outdoor pot-culture experiment. In the screening experiment, only Conyza canadensis and Rorippa globosa displayed Cd-hyperaccumulative characteristics. In a further concentration gradient experiment, C. canadensis was affirmed that it is not a Cd hyperaccumulator. Only R. globosa, indicated all Cd hyperaccumulative characteristics, especially Cd concentration in its stems and leaves were higher than 100 mg/kg, the minimum Cd concentration what a Cd-hyperaccumulator should accumulate. Thus, R. globosa was further validated as a Cd-hyperaccumulator.
植物修复仍然非常需要筛选超富集植物。杂草物种具有对恶劣环境耐受性强、生长迅速和繁殖率高等特性，可能是植物修复的理想植物。本研究的目的是通过室外盆栽试验，研究9科24种植物对镉、铅、铜和锌的耐受性和超富集特性。在筛选试验中，只有小飞蓬和球果蔊菜表现出镉超富集特性。在进一步的浓度梯度试验中，证实小飞蓬不是镉超富集植物。只有球果蔊菜表现出所有镉超富集特性，尤其是其茎和叶中的镉浓度高于100mg/kg，这是镉超富集植物应积累的最低镉浓度。因此，球果蔊菜被进一步确认为镉超富集植物。
