Oxic and anoxic conditions affect arsenic (As) accumulation and arsenite transporter expression in rice.
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.
School of Metallurgy and Environment, Central South University, Changsha 410083, China. Electronic address: wuchuan@csu.edu.cn.
Chuan
C
Wu
School of Metallurgy and Environment, Central South University, Changsha 410083, China.
Liu
L
Huang
School of Metallurgy and Environment, Central South University, Changsha 410083, China. Electronic address: sgxue@csu.edu.cn.
Sheng-Guo
SG
Xue
College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China.
Wei-Song
WS
Pan
School of Metallurgy and Environment, Central South University, Changsha 410083, China.
Qi
Q
Zou
Crop and Environment Sciences Department, Harper Adams University, Newport, Shropshire, TF10 8NB, United Kingdom.
William
W
Hartley
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.
Ming-Hung
MH
Wong
D001151:Arsenic / Q000032:analysis*; D018053:Arsenites / Q000032:analysis / Q000378:metabolism; D015536:Down-Regulation; D055868:Floods; D005506:Food Contamination / Q000032:analysis; D005838:Genotype; D012275:Oryza; D010100:Oxygen; D018517:Plant Roots / Q000737:chemistry
D018053:Arsenites; C015001:arsenite; D001151:Arsenic; D010100:Oxygen
Aquaporin; Arsenic accumulation; Arsenite; Flooding; Rice genotype