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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Titanium Dioxide Nanoparticles Alleviate Tetracycline Toxicity to Arabidopsis thaliana (L.)
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Titanium Dioxide Nanoparticles Alleviate Tetracycline Toxicity to Arabidopsis thaliana (L.)

机译：二氧化钛纳米粒子可缓解四环素对拟南芥（L.）的毒性毒性

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Arabidopsis thaliana (L.) Heynh. was used as a model plant to investigate the biochemical and molecular response upon coexposures to tetracycline (TC) and titanium oxide nanoparticles (TiO2 NPs). Results showed that 1 mg/L TC severely reduced A. thaliana biomass by 33.3% as compared with the control; however, the presence of 50 and 100 mg/L TiO2 NPs alleviated TC toxicity, increasing fresh biomass by 45% and 28%, respectively, relative to the TC alone treatment. The presence of TC notably decreased Ti accumulation in both shoots and roots. Antioxidant enzyme activity, including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and peroxidase (POD), in A. thaliana shoots and roots indicated that TC significantly increased the activity of reactive oxygen species (ROS) scavengers. However, in the coexposure treatments, TiO2 NPs reduced antioxidant enzyme activity back to the control levels. The relative expression of genes encoding sulfur assimilation and glutathione biosynthesis pathways was separately measured in shoots and roots. Interestingly, the relative expressions of adenylytransferase (APT), adenosine-5'-phosphosulfate reductase (APR), and sulfite reductase (SiR) in the roots across all three treatments (TC alone, TiO2 NPs alone, and TC X TiO2 NPs treatment) were 2-3.5-fold higher than the control. The expression of gamma-glutamylecysteine synthetase (ECS) and glutathione synthetase (GS) was increased in A. thaliana treated with either TiO2 NPs or TC alone. At harvest, almost 93% reduction of the pod biomass was evident in the TC alone treatment as compared with the control; however, TiO2 NPs increased the pod biomass by 300% in the coexposed plants relative to the TC alone treatment. These findings provide important information for understanding the interactions of metal-based NPs and cocontaminants such as antibiotics in plant systems.
机译：拟南芥（L.）Heynh。用作模型植物，以研究椰子素（TC）和氧化钛纳米颗粒（TiO2 NPS）的椰子化和分子响应。结果表明，与对照相比，1毫克/吨TC严重减少了A.拟南芥生物量33.3％;然而，50和100mg / L TiO2 NPS的存在缓解了Tc毒性，相对于单独处理分别将新的生物量增加45％和28％。 TC的存在显着降低了两次射击和根部的Ti积累。抗氧化酶活性，包括超氧化物歧化酶（SOD），过氧化氢酶过氧化物酶（APX）和过氧化物酶（POD），表明TC显着增加了活性氧（ROS）清除剂的活性。然而，在椰子处理中，TiO2 NPS将抗氧化酶活性降低回对照水平。编码硫同化和谷胱甘肽生物合成途径的基因的相对表达在芽和根中单独测量。有趣的是，腺苷转移酶（Apt），腺苷-5'-磷硫酸盐还原酶（APR）和亚硫酸盐还原酶（SIR）在所有三种处理中的亚硫酸盐还原酶（SIR）（单独TC，TiO 2 NPS，以及TC x TiO2 NPS处理）比对照高2-3.5倍。在用TiO2 NPS或TC处理的A.拟南芥中，γ-戊二酰基二氨基合成酶（ECS）和谷胱甘肽合成酶（GS）的表达增加。在收获，与对照相比，在TC单独治疗中，豆荚生物量的几乎93％的减少;然而，TiO2 NPS相对于单独的TC在椰子植物中将荚生物量增加300％。这些发现提供了理解金属基NPS和CoContamination等植物系统抗生素的相互作用的重要信息。

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