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Modified accumulation of selected heavy metals in bt transgenic rice

Journal of Environmental Sciences 2009年第11期21卷 1607-1612页

作者： WANG Haiyan, HUANG Jianzhong, YE Qingfu, WU Dianxing, CHEN Ziyuan Institute of Nuclear Agricultural Sciences, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, Zhejiang University, Hangzhou 310029, China [a]Institute of Nuclear Agricultural Sciences Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province Zhejiang University Hangzhou 310029 China

Safety assessment of genetically modified crops generally does not take into account the potential hazard of altered patterns of heavy metal accumulation in plants. A pot experiment was conducted under greenhouse conditions to evaluate the impact of heavy metal amendments on the accumulation of Cd, Cu, Pb and Zn in a bt transgenic rice Ke-Ming-Dao （KMD） and its wild-type Xiushui 11 （Xs11）. In control soils, significant difference was only found in contents of Cu （p 〈 0.01） and Pb （p 〈 0.05） in straw between KMD and Xs11. At three levels of Cd amendments （5, 10, and 20 mg/kg）, the Cd contents in grain and straw of KMD were significantly higher than those of Xs11, and all grain Cd contents were significantly higher than the International Criteria （0.2-0.4 mg/kg） as specified by the Codex Alimentarius Commission （CAC）. These results implied that it may be unsafe for growing bt transgenic rice in heavily Cd-polluted areas. No significant difference in Zn was found between the two varieties with the exception of roots at Zn amendment level of 600 mg/kg, while Pb contents in KMD were much higher in the straw at the lead amendment level of 1000 mg/kg and in the root at 250 mg Pb/kg. Data on the heavy metal accumulation patterns for the genetically modified rice may be used for the selection of growing areas as well as for plant residue management for bt rice.

关键词： bt transgenic rice heavy metal bioaccumulation trace elements

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Field Evaluation of Nitrogen Responses of bt transgenic rice in Two Insects-Control Conditions

Field Evaluation of Nitrogen Responses of Bt Transgenic Rice...

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第十五届中国科协年会第10分会场：信息化与农业现代化研讨会

作者： LI Zhongzheng WANG Depeng HUANG Jianliang MOA Key Laboratory of Crop Physiology Ecology and Cultivation (The Middle Reaches of Yangtze River) Huazhong Agricultural University

Studies showed rice plants suffered relatively more pressure from pests in higher nitrogen fertilizer levels, and bt-endotoxin proteins varied in different plant parts with the age of the plant causing variation in efficacy of bt crops against target pests. Therefore, it is meaningful to study how is the efficacy of bt transgenic rice against lepidopteran pests in response to N fertilizer application. Our studies aimed to determine the yield differences of bt transgenic rice genotypes over non transgenic genotypes in insects control treatments, and examine the genotypic variation in agronomic and morphological traits under different nitrogen treatments. It proves that hybrid rice genotypes suffered more yields loss, and had significantly less yields than bt genotypes, due to the more serious damage caused by insects invasion. It is found that rice plants suffered relatively more pressure from pests in higher nitrogen fertilizer levels, and the bt genotypes suffered less yields loss (13.7%) than hybrid genotypes (52.1%) in zero insects-control treatments. Our results also indicate that the yield components data indicated that larger effective panicles number of bt genotypes contributed higher final yields;bt-endotoxin concentration correlated significantly with the N level. Therefore, it is meaningful to take advantage of bt rice with the combination of higher yield, insects resistance and N use efficiency.

关键词： bt transgenic rice bt protein concentration grain yield nitrogen management insecticide

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