title: Effects of silicon (Si) on arsenic (As) accumulation and speciation in rice (Oryza sativa L.) genotypes with different radial oxygen loss (ROL).
abstract: Arsenic (As) contamination of paddy soils has adversely affected the health of millions of people those consuming rice for staple food. The present study was aimed at investigating the effects of silicon (Si) fertilization on As uptake, speciation in rice plants with different radial oxygen loss (ROL). Six genotypes were planted in pot soils under greenhouse conditions until late tillering state. The results showed that the rates of ROL were higher in hybrid rice genotypes varying from 19.76 to 27 μmol O2 g(-1) root dry weight h(-1) than that in conventional indica rice genotypes varying from 9.55 to 15.41 μmol O2 g(-1) root dry weight h(-1). Si addition significantly increased straw biomass (p<0.005), but with no significant effects on root biomass. Si fertilization significantly reduced shoot and root total As concentrations (p<0.001) in six genotypes grown in 40 mg As/kg soil. Si addition decreased the inorganic As in shoots of 'Xiangfengyou-9' with lower ROL and 'Xiangwanxian-12' with higher ROL by 31% and 25% respectively and had the tendency to increase DMA concentrations. It is potential to reduce As contamination of rice efficiently by combining Si fertilization and selecting genotypes with high radial oxygen loss.
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.
authors.forename: Chuan
authors.initials: C
authors.lastname: Wu
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zou
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha 410083, PR China. Electronic address: sgxue@csu.edu.cn.
authors.forename: Shengguo
authors.initials: S
authors.lastname: Xue
authors.affiliation: School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.
authors.forename: Jingyu
authors.initials: J
authors.lastname: Mo
authors.affiliation: College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Weisong
authors.initials: W
authors.lastname: Pan
authors.affiliation: College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
authors.forename: Laiqing
authors.initials: L
authors.lastname: Lou
authors.affiliation: Consortium on Health, Environment, Education and Research (CHEER), Hong Kong Institute of Education, Tai Po, Hong Kong Special Administrative Region.
authors.forename: Ming Hung
authors.initials: MH
authors.lastname: Wong
mesh_terms: D001151:Arsenic / Q000737:chemistry* / Q000378:metabolism*; D018533:Biomass; D005308:Fertilizers; D005838:Genotype; D012275:Oryza / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D012825:Silicon / Q000494:pharmacology*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry / Q000378:metabolism
chemical_list: D005308:Fertilizers; D012987:Soil; D012989:Soil Pollutants; D001151:Arsenic; D010100:Oxygen; D012825:Silicon
keywords: Arsenic; Radial oxygen loss (ROL); Rice; Silicon fertilization