THE EFFECTS OF PHOSPHATE ON ARSENIC UPTAKE AND TOXICITY ALLEVIATION IN TOBACCO GENOTYPES WITH DIFFERING ARSENIC TOLERANCES

被引:26
作者
Zvobgo, Gerald [1 ]
Hu, Hongliang [1 ]
Shang, Shenghua [2 ]
Shamsi, Imran Haider [1 ]
Zhang, Guoping [1 ]
机构
[1] Zhejiang Univ, Dept Agron, Key Lab Crop Germplasm Resource, Coll Agr & Biotechnol, Hangzhou 310003, Zhejiang, Peoples R China
[2] Guizhou Tobacco Sci Inst, Guiyang, Peoples R China
关键词
Accumulation; Arsenate; Genotype; Phosphate; Tobacco; LIPID-PEROXIDATION; ANTIOXIDATIVE ENZYMES; RICE; ACCUMULATION; CADMIUM; GROWTH; TRANSLOCATION; TRANSPORTERS; PARAMETERS; STRESS;
D O I
10.1002/etc.2776
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Phosphate (PO43-) has been reported to suppress arsenate (As-v) uptake in plants. However, its effects on controlling the availability of As-v in tobacco genotypes with different arsenic (As) tolerances has not been fully explored. In the present study, the effects of PO43- on As-v uptake were investigated in a hydroponic culture using 2 tobacco (Nicotiana tabacum) genotypes (ZY90 and FSMY) that differed in As-v tolerance. A total of 9 treatment combinations comprising As-v treatments of 0 mu M, 10 mu M, and 100 mu M and PO43- treatments of 0 mu M, 50 mu M, and 500 mu M were used. The results showed that ZY90 had greater reductions in leaf photosynthetic parameters, root and shoot dry weight, length, and nutrient content than did FSMY when exposed to As-v stress. The addition of 500 mu M external PO43- significantly suppressed As-v (100 mu M) uptake in both FSMY and ZY90, with the effect being more pronounced in FSMY. Greater PO43- uptake in plants significantly reduced the influx of As-v, causing an increase in photosynthesis and nutrient uptake. Phosphate supply increased superoxide dismutase activity, catalase activity, and malondialdehyde content. The present study showed that PO43- is an effective competitive inhibitor of As-v, and it can be effectively used to control As-v accumulation in tobacco plants. Environ Toxicol Chem 2015;34:45-52. (c) 2014 SETAC
引用
收藏
页码:45 / 52
页数:8
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