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Environ Pollut. 2016 May;212:27-33. doi: 10.1016/j.envpol.2016.01.004. Epub 2016 Feb 1.

The effect of silicon on iron plaque formation and arsenic accumulation in rice genotypes with different radial oxygen loss (ROL).

Author information

1
School of Metallurgy and Environment, Central South University, Changsha 410083, China. Electronic address: wuchuan@csu.edu.cn.
2
School of Metallurgy and Environment, Central South University, Changsha 410083, China.
3
School of Metallurgy and Environment, Central South University, Changsha 410083, China. Electronic address: sgxue@csu.edu.cn.
4
College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China.
5
Crop and Environment Sciences Department, Harper Adams University, Newport, Shropshire, TF10 8NB, United Kingdom.
6
Consortium on Health, Environment, Education and Research (CHEER), Hong Kong Institute of Education, Tai Po, Hong Kong Special Administrative Region; School of Environment, Jinan University, Guangzhou, China.

Abstract

Rice is one of the major pathways of arsenic (As) exposure in human food chain, threatening over half of the global population. Greenhouse pot experiments were conducted to examine the effects of Si application on iron (Fe) plaque formation, As uptake and rice grain As speciation in indica and hybrid rice genotypes with different radial oxygen loss (ROL) ability. The results demonstrated that Si significantly increased root and grain biomass. Indica genotypes with higher ROL induced greater Fe plaque formation, compared to hybrid genotypes and sequestered more As in Fe plaque. Silicon applications significantly increased Fe concentrations in iron plaque of different genotypes, but it decreased As concentrations in the roots, straws and husks by 28-35%, 15-35% and 32-57% respectively. In addition, it significantly reduced DMA accumulation in rice grains but not inorganic As accumulation. Rice of indica genotypes with higher ROL accumulated lower concentrations of inorganic As in grains than hybrid genotypes with lower ROL.

KEYWORDS:

Arsenic; Iron plaque; Radial oxygen loss; Rice; Silicon

PMID:
26840513
DOI:
10.1016/j.envpol.2016.01.004
[Indexed for MEDLINE]

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