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| Selection for low-Cd-accumulating cultivars of pakchoi(Brassica chinensis L.), effects of sulfur on Cd content, and quality characters under Cd stress |
| Received:December 03, 2017 |
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| KeyWord:pakchoi (Brassica chinensis L.);selecting;low-Cd-accumulating cultivars(LCACs);cadmium;sulfur |
| Author Name | Affiliation | E-mail | | DU Xiao-ping | College of Life Sciences, Northwest A & F University, Yangling 712100, China | | | KANG Jing-quan | College of Life Sciences, Northwest A & F University, Yangling 712100, China | | | LÜ Jin-yin | College of Life Sciences, Northwest A & F University, Yangling 712100, China | Jinyinlu@163.com |
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| Abstract: |
| In order to reduce the risk of heavy metal pollution, pot culture experiments were performed to screen out low-Cd-accumulating cultivars(LCACs)and high-Cd-accumulating cultivars(HCACs)from among 36 pakchoi cultivars, and plot experiments were conducted to investigate the influence of exogenous sulfur on Cd content and nutritional quality in edible parts under Cd stress. Results of the pot culture experiments revealed that the biomass and Cd concentrations of the edible parts of the plant under the three Cd treatments varied significantly across cultivars. Two cultivars, ZLL and AJH, met all the screening criteria of LCACs, and thus could be categorized as LCACs. In contrast, HPCGB and KR605, which had the highest Cd concentrations in edible parts under Cd1(1 mg·kg-1 Cd)and Cd5(5 mg·kg-1 Cd) treatments, were selected as HCACs. The plot experiments further confirmed the results of the pot culture experiments and the low Cd accumulating traits of the two LCACs under various Cd treatments. The soluble protein, soluble sugar, and nitrate content in the edible parts of the four selected cultivars was higher than that in the control when exposed to Cd1, and the nitrate content in the edible parts of the four selected cultivars exceeded the National Food Safety Standards in China(GB 18406.1-2001)under the Cd5 treatment. Exogenous sulfur could effectively decrease Cd and nitrate content, whereas it increases the soluble protein, soluble sugar, and vitamin C content in edible parts of pakchoi. In conclusion, cultivating LCACs(ZLL and AJH)with a Cd concentration ≤ 1 mg·kg-1 as well as applying sulfur could reduce Cd content in the edible parts of pakchoi and improve vegetable quality. |
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