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Oxic and anoxic conditions affect arsenic (As) accumulation and arsenite transporter expression in rice
- Source :
- Chemosphere. 168
- Publication Year :
- 2016
-
Abstract
- Arsenic (As) exposure from rice consumption has now become a global health issue. This study aimed to investigate the effects of rice rhizosphere oxic conditions on silicate transporter (responsible for arsenite transportation) expressions, and on As accumulation and speciation in four rice genotypes, including two hybrid genotypes (Xiangfengyou9, Shenyou9586) and two indica subspecies (Xiangwanxian17, Xiangwanxian12). Oxic and anoxic treatments have different effects on root length (p < 0.001) and weight (p < 0.05). Total As concentrations in roots were dramatically lower in oxic treatments (88.8–218 mg/kg), compared to anoxic treatments (147–243 mg/kg) (p < 0.001). Moreover, root and shoot arsenite concentrations in oxic treatments were lower than that in anoxic treatments in arsenite treatments. The relative abundance of silicate transporter expressions displayed a trend of down-regulation in oxic treatments compared to anoxic treatments, especially significantly different for Xiangwanxian17, Xiangwanxian12 in Lsi1 expressions (p < 0.05), Xiangfengyou9, Shenyou9586, Xiangwanxian17 in Lsi2 expressions (p < 0.05). However, there were no significant differences of transporter expressions in different As treatments and genotypes. It may be a possible reason for low As accumulation in rice growing aerobically compared to flooded condition and a potential route to reduce the health risk of As in rice.
- Subjects :
- Environmental Engineering
Genotype
Arsenites
Health, Toxicology and Mutagenesis
media_common.quotation_subject
0211 other engineering and technologies
chemistry.chemical_element
Down-Regulation
Food Contamination
02 engineering and technology
010501 environmental sciences
Biology
01 natural sciences
Plant Roots
Arsenic
chemistry.chemical_compound
Animal science
Environmental Chemistry
Relative species abundance
0105 earth and related environmental sciences
Arsenite
media_common
021110 strategic, defence & security studies
Rhizosphere
Ecology
Public Health, Environmental and Occupational Health
food and beverages
Transporter
Oryza
General Medicine
General Chemistry
Pollution
Anoxic waters
Floods
Oxygen
Speciation
chemistry
Shoot
Subjects
Details
- ISSN :
- 18791298
- Volume :
- 168
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....25c8e3e869b849c7a80797cff9691c99