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

作　　者：Bing Li Xun Wang Xiaoli Qi Lu Huang Zhihong Ye 

机构地区：[1]State Key Laboratory for Bio-control and Guangdong Key Laboratory of Plant Resources,School of Life Sciences,Sun Yat-sen University,Guangzhou 510006,China

出　　处：《Journal of Environmental Sciences》2012年第10期1790-1798,共9页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 30770417,31070450);the NSFC-Guangdong United Foundation (No. U0833004);the Natural Science Foundation of Guangdong,China(No. 07003650,10151027501000008)

摘　　要：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 cultlvars 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 eultivars with low mixed toxic element （Cd, Pb） and high micronutrient contents along with high grain yields, thus ensuring food safety and quality.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 cultlvars 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 eultivars with low mixed toxic element （Cd, Pb） and high micronutrient contents along with high grain yields, thus ensuring food safety and quality.

关 键 词：rice （Oryza sativa L.） mixed toxic elements MICRONUTRIENT grain yield 

分 类 号：TS216[轻工技术与工程—粮食、油脂及植物蛋白工程] S511[轻工技术与工程—食品科学与工程]