| 卢云青,周长瑞,杨垚,彭程,林匡飞.十溴联苯醚与镉复合污染对水稻种子萌发与幼苗生长的毒性效应[J].农业环境科学学报,2023,42(12):2752-2762. |
| 十溴联苯醚与镉复合污染对水稻种子萌发与幼苗生长的毒性效应 |
| Combined effects of decabromodiphenyl ether and cadmium on the seed germination and seedling growth of rice（Oryza sativa L.） |
| 投稿时间：2023-04-08 |
| DOI：10.11654/jaes.2023-0269 |
| 中文关键词: 十溴联苯醚 镉 复合污染 发芽 植物毒性 水稻 |
| 英文关键词: BDE-209 Cd co-contamination germination phototoxicity rice |
| 基金项目:国家重点研发计划项目（2019YFC1803701）；国家自然科学基金项目（42177395） |
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| 中文摘要: |
| 为评估十溴联苯醚（BDE-209）与镉（Cd）的联合植物毒性，本研究通过水培试验研究了Cd和BDE-209单独及联合作用对水稻种子发芽、幼苗生长、光合色素含量和抗氧化酶活性的影响。结果表明：单独作用下，低浓度Cd和BDE-209对种子发芽和生长均表现为促进作用，而高浓度胁迫则会导致各项指标的降低；两种污染物的联合作用在低浓度Cd胁迫下（1 mg·L-1）主要表现为协同效应，在高浓度Cd处理中（50 mg·L-1）表现为拮抗作用。Cd与各项生长指标之间均存在显著的剂量-效应关系，其中根部对Cd胁迫的响应最敏感，而BDE-209仅与根鲜质量和根伸长间存在剂量-效应关系。Cd和BDE-209单独胁迫下水稻种子根鲜质量的半数抑制浓度分别为5.05 mg·L-1和6.09 mg·L-1。Cd和BDE-209均能提高水稻幼苗体内的抗氧化酶活性，过氧化物酶和超氧化物歧化酶分别对Cd污染和BDE-209污染有良好的指示作用。研究表明，相较于Cd的单独污染，BDE-209的存在能够缓解高浓度Cd对种子萌发和幼苗生长的毒害作用。 |
| 英文摘要: |
| In order to evaluate the combined phytotoxicity of decabromodiphenyl ether （BDE-209）and cadmium（Cd）, hydroponic experiments were conducted; we specifically evaluated the singular and combined effects of BDE - 209 and Cd on the seed germination, seedling upgrowth, photosynthetic pigments, and antioxidant enzymes activities of Oryza sativa L. The results of this study showed that the singular effect of Cd and BDE-209 at low concentrations was the promotion of germination and growth of seeds, whereas higher Cd- or BDE-209- induced stress led to a corresponding decrease in various parameters. The combined effect of BDE-209 and Cd was synergistic at 1 mg·L-1 of Cd-induced stress and antagonistic at 50 mg·L-1 of Cd-induced stress. There was a significant dose-response relationship between Cd and the growth parameters of O. sativa, among which the root was the most sensitive. Further, there was a dose-response relationship between BDE-209 and root parameters. The calculated IC50 values for root biomass were 5.05 mg·L-1 and 6.09 mg·L-1 under Cd-induced stress and BDE-209-induced stress, respectively. The singular effect of Cd and BDE-209 treatment was the enhancement of antioxidant enzyme activities in rice seedling leaves. Specifically, SOD was determined to act as an effective biomarker for BDE-209 contamination, while POD was more sensitive to Cd contamination. Overall, this study demonstrated that BDE-209 could alleviate the toxic effects of highconcentration Cd on seed germination and seedling growth. |
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