The Effects of Silicon on Arsenic Accumulation and Speciation in Different Tissues of Mature Rice (Oryza Sativa)
Rice (Oryza sativa) is one of the staple food crops in the world.Inorganic As and dimethylarsinic acid (DMAⅤ) are predominant As species in rice grain.Arsenite is taken up by rice roots mainly through the Si uptake pathway.To investigate whether Si addition influences As species in mature rice tissues,a soil pot experiment was carried out in a greenhouse.The results showed that Si addition significantly decreased total As concentration in each individual leaf and stem by 2.83-11.7 folds and in husk and grain by 2.8 and 2.9 folds,respectively.AsⅢ,AsⅤ and DMAⅤ were detected in the different tissues of mature rice plants.Inorganic arsenic (the sum of AsⅢ and AsⅤ) was the predominant species,accounting for 54.1%-99.8% whether Si addition or not.Furthermore,Si addition significantly decreased AsⅢ concentrations and total As levels in different plant tissues compared to-Si treatment (p<0.001).Further experiments are being conducted to investigate how Si influences arsenic speciation in rice.
AsⅢ DMAⅤ Asv Silicon, Mature rice
W.J.Liu F.J.Zhao M.Asaduzzaman Khan S.P.McGrath
College of Resources and Environmental Sciences,Hebei Agricultural University,Baoding,China,071000;R College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing,China;Rotham Rothamsted Research,Harpenden,Hertfordshire AL5 2JQ,UK
国际会议
3rd International Conference on Pollution Ecology(第三届污染生态学国际会议(3rd ICPE))
天津
英文
91-92
2012-11-06（万方平台首次上网日期，不代表论文的发表时间）