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High cadmium pollution risk on vegetable amaranth and a selection for pollution-safe cultivars to lower the risk |
Yihui ZHOU1, Meng XUE1, Zhongyi YANG1(), Yulian GONG1, Jiangang YUAN1(), Chunyan ZHOU2, Baifei HUANG1 |
1. State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; 2. Heshan Agricultural Bureau, Heshan 529700, China |
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Abstract A pot experiment was carried out by growing 29 different genotypes (Amaranthus spp.) of vegetable amaranth under low- (0.12 mg·kg-1) and middle- (0.40 mg·kg-1) cadmium (Cd) exposure. The result showed that amaranth was vulnerable to cadmium (Cd) contamination in soil. Variations of Cd concentrations in both roots and edible parts among genotypes were significant (P<0.001) in both treatments. Cd concentrations in edible parts of the tested genotypes grown under low- and middle-Cd levels were significantly correlated (p<0.01), implying that Cd-accumulating property of amaranth is genotype-dependent. Differences in Cd chemical forms between cv. Nanxingdayemashixian (cv. Nan), a selected typical pollution-safe cultivar (Cd-PSC), and cv. Pennongjianyexian (cv. Pen), a selected typical non-Cd-PSC, under different Cd exposure conditions were compared. It was found that the alternation of Cd in FNaCl (Cd form extracted by 1 mol·L-1 NaCl) may be a key factor in regulating Cd accumulation of different amaranth genotypes and that the protein-binding Cd is considered to be associated with Cd translocation. The results indicated that amaranth is capable of enduring high level of Cd pollution when grown as vegetable crop, and accordingly, consuming vegetable amaranth would bring high health risk. Therefore, adopting Cd-PSC strategy would help reducing the risk of Cd pollution in amaranth. In this study, cv. Nan was identified as a Cd-PSC and recommended to be applied production practice.
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Keywords
Amaranth
Cadmium (Cd)
Cd accumulation
pollution-safe cultivar (PSC)
Cd chemical forms
health risk
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Corresponding Author(s):
YANG Zhongyi,Email:adsyzy@mail.sysu.edu.cn; YUAN Jiangang,Email:yuanjg@mail.sysu.edu.cn
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Issue Date: 01 April 2013
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