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首页> 外文期刊>Australian Journal of Crop Science >Plant physiological impacts and flavonoid metabolic responses to uptake TiO 2 nanoparticles
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Plant physiological impacts and flavonoid metabolic responses to uptake TiO 2 nanoparticles

机译：植物生理撞击和黄酮类药物代谢反应对摄取TiO 2纳米颗粒

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The presence of Titanium dioxide nanoparticles (TiO 2 NPs) contamination in the environment is of concern because of their oxidative effect on organisms. Transgenic tobaccos that overexpressed PAP1, a MYB75 gene, were used to investigate the response of plants to the presence of TiO 2 NPs and the results were compared to those for wild type (WT) plants. The experiment was performed under tissue culture conditions with daylight fluorescence. The physiological responses of the plants under moderately low concentrations of TiO 2 NPs (20–40 mg L -1 ) were analyzed in relation to metabolic responses and the results were compared to those of plants under zero TiO 2 conditions. Under conditions of 20 mg L -1 TiO 2 , WT and PAP1 plants showed better physiology than plants under other conditions. These plants had higher chlorophyll and carotenoid levels, and better membrane stability than plants under non TiO 2 conditions. The WT plants grown in medium at 40 mg L -1 TiO 2 showed deteriorated physiology, while PAP1 plants grown under the same condition were shown various changes in physiology depending on the line. Moreover, the content of total soluble sugar (TSS) and flavonoids in the extracts of plant were increased in response to the concentrations of TiO 2 . However, all PAP1 transgenics had flavone and flavonol contents that were approximately 2–3 times the levels found in WT plants, while TSS and anthocyanin subgroup levels were not different among the WT and transgenic plants. Excessive nanoparticles can induce oxidative damage in cells, and it appears that PAP1 transgenics can alleviate such damage by enhancing flavonoid accumulation.
机译：由于对生物体的氧化作用，环境中的二氧化钛纳米颗粒（TiO 2 NPS）污染的存在是关注的。过表达PAP1，MYB75基因的转基因Tobaccos用于研究植物对TiO 2 NPS的响应，结果与野生型（WT）植物进行比较。在组织培养条件下进行实验，具有日光荧光。分析了在中等低浓度的TiO 2NPS（20-40mg L -1）下的植物的生理反应与代谢反应相关，并将结果与​​零TiO 2条件下的植物进行比较。在20mg L -1 TiO 2的条件下，WT和PAP1植物在其他条件下表现出比植物更好的生理学。这些植物具有更高的叶绿素和类胡萝卜素水平，并且在非TiO 2条件下的植物具有更好的膜稳定性。在40mg L-1 TiO 2中培养的WT植物表现出恶化的生理学，而PAP1植物在相同条件下生长的植物根据线条显示了各种生理学变化。此外，响应于TiO 2的浓度，增加了植物提取物中的总可溶性糖（TSS）和黄酮类化合物的含量。然而，所有PAP1转基因都有黄酮和黄酮醇含量，其在WT植物中发现的水平约为2-3倍，而TSS和花青素亚组水平在WT和转基因植物中没有不同。过量的纳米颗粒可以在细胞中诱导氧化损伤，似乎PAP1转基因可以通过增强类黄酮积累来缓解诸如损伤。

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