Identification of rice cultivars with low brown rice mixed cadmium and lead contents and their interactions with the micronutrients iron, zinc, nickel and manganese

• Published in: Journal of environmental sciences (China) Vol. 24; no. 10; pp. 1790 - 1798
• Main Authors: Li, Bing, Wang, Xun, Qi, Xiaoli, Huang, Lu, Ye, Zhihong
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.10.2012; State Key Laboratory for Bio-control and Guangdong Key Laboratory of Plant Resources, School of Life Sciences,Sun Yat-sen University, Guangzhou 510006, China
• Subjects: brown rice; cadmium; cultivars; Environmental Pollutants - chemistry; Environmental Pollutants - metabolism; food safety; grain yield; heavy metals; Hydrogen-Ion Concentration; hydroponics; iron; lead; manganese; Metals, Heavy - chemistry; Metals, Heavy - metabolism; micronutrient; Mining; mixed toxic elements; nickel; Oryza - chemistry; Oryza - classification; Oryza - metabolism; Oryza sativa; paddies; rice (Oryza sativa L.); Soil - chemistry; toxic substances; toxicity; zinc; 品种鉴定; 微量营养素; 有毒重金属; 水稻品种; 混合; 相互作用; 糙米; 铅含量; rice (Oryza sativa L.); grain yield; mixed toxic elements; micronutrient
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/S1001-0742(11)60972-8

Paddy fields in mining areas are usually co-contaminated by a cocktail of mixed toxic heavy metals (e.g., Cd and Pb in Pb/Zn mines). However, previous studies on rice cultivars screened for effective metal exclusion have mostly focused on individual metals, and have been conducted under pot-trial or hydroponic solution conditions. This study identified rice cultivars with both low Cd and Pb accumulation under Cd- and Pb-contaminated field conditions, and the interactions of the toxic elements Cd and Pb with the micronutrient elements Fe, Zn, Mn and Ni were also studied. Among 32 rice cultivars tested, there were significant differences in Cd (0.06–0.59 mg/kg) and Pb (0.25–3.15 mg/kg) levels in their brown rice, and similar results were also found for the micronutrient elements. Significant decreases in concentrations of Fe and Mn were detected with increasing Cd concentrations and a significant elevation in Fe, Mn and Ni with increasing Pb concentrations. A similar result was also shown by Cd and Ni. Three cultivars were identified with a combination of low brown rice Cd and Pb, high micronutrient and grain yield (Wufengyou 2168, Tianyou 196 and Guinongzhan). Present results suggest that it is possible to breed rice cultivars with low mixed toxic element (Cd, Pb) and high micronutrient contents along with high grain yields, thus ensuring food safety and quality.