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- Title
Screening of a new cadmium hyperaccumulator, Galinsoga parviflora, from winter farmland weeds using the artificially high soil cadmium concentration method.
- Authors
Lin, Lijin; Jin, Qian; Liu, Yingjie; Ning, Bo; Liao, Ming'an; Luo, Li
- Abstract
A new method, the artificially high soil cadmium (Cd) concentration method, was used to screen for Cd hyperaccumulators among winter farmland weeds. Galinsoga parviflora was the most promising remedial plant among 5 Cd accumulators or hyperaccumulators. In Cd concentration gradient experiments, as soil Cd concentration increased, root and shoot biomass decreased, and their Cd contents increased. In additional concentration gradient experiments, superoxide dismutase and peroxidase activities increased with soil Cd concentrations up to 75 mg kg−1, while expression of their isoenzymes strengthened. Catalase (CAT) activity declined and CAT isoenzyme expression weakened at soil Cd concentrations less than 50 mg kg−1. The maxima of Cd contents in shoots and roots were 137.63 mg kg−1 and 105.70 mg kg−1, respectively, at 100 mg kg−1 Cd in soil. The root and shoot bioconcentration factors exceeded 1.0, as did the translocation factor. In a field experiment, total extraction of Cd by shoots was 1.35 mg m−2 to 1.43 mg m−2 at soil Cd levels of 2.04 mg kg−1 to 2.89 mg kg−1. Therefore, the artificially high soil Cd concentration method was effective for screening Cd hyperaccumulators. Galinsoga parviflora is a Cd hyperaccumulator that could be used to efficiently remediate Cd-contaminated farmland soil. Environ Toxicol Chem 2014;33:2422-2428. © 2014 SETAC
- Subjects
CADMIUM; SOIL composition; SOIL remediation; PHYTOREMEDIATION; HEAVY metals; WEEDS
- Publication
Environmental Toxicology & Chemistry, 2014, Vol 33, Issue 11, p2422
- ISSN
0730-7268
- Publication type
Article
- DOI
10.1002/etc.2694