Qiu Chen-Chen, Li Guo-Xin, Li Qing-Song, Yan Chang-Zhou
Key Laboratory of Water Resources Utilization and Protection of Xiamen, School of Environmental Science and Engineering, Xiamen University of Technology, Xiamen 361024, China.
Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Huan Jing Ke Xue. 2022 Aug 8;43(8):4387-4393. doi: 10.13227/j.hjkx.202110021.
The pollution of micro/nanoplastics in the natural environment is becoming increasingly serious, but the potential effects of nanoplastics on crops remain unclear. In the present study, the effects of polystyrene nanoplastics (PS-NPs) with a particle size of 80 nm on the chlorophyll content, antioxidant enzyme activity, and nutritional quality of L. were explored via hydroponic culture. The results showed that the chlorophyll contents in leaves of treated with PS-NPs were significantly lower than those in the control, indicating that the synthesis of chlorophyll was inhibited. The superoxide dismutase (SOD), ascorbate peroxidase (APX) activities, and proline contents in leaves of initially increased but then decreased with the increase in (PS-NPs). The activity of guaiacol peroxidase (POD) increased with the increase in (PS-NPs) for 10 days of treatment; however, it was inhibited for 20 days of treatment. The malondialdehyde (MDA) content increased with the rise in (PS-NPs). When (PS-NPs) increased to 100 mg·L, the MDA content in leaves of increased by 43.24% and 89.70% for 10 and 20-day treatments, respectively, compared with those in the control. Meanwhile, the contents of soluble protein, soluble sugar, and vitamin C were higher than those in the control for 10-day treatments; however, the vitamin C content decreased by 26.53% after 20 days of treatment. These results indicated that PS-NPs had a significant oxidative stress on , and a high concentration of PS-NPs stress would have deleterious effects on the nutritional quality of .
自然环境中微/纳米塑料的污染日益严重，但纳米塑料对农作物的潜在影响仍不清楚。在本研究中，通过水培法探究了粒径为80 nm的聚苯乙烯纳米塑料（PS-NPs）对生菜叶绿素含量、抗氧化酶活性和营养品质的影响。结果表明，用PS-NPs处理的生菜叶片叶绿素含量显著低于对照，表明叶绿素的合成受到抑制。生菜叶片中的超氧化物歧化酶（SOD）、抗坏血酸过氧化物酶（APX）活性和脯氨酸含量最初随PS-NPs浓度的增加而增加，但随后下降。愈创木酚过氧化物酶（POD）活性在处理10天时随PS-NPs浓度的增加而增加；然而，在处理20天时受到抑制。丙二醛（MDA）含量随PS-NPs浓度的升高而增加。当PS-NPs浓度增加到100 mg·L时，处理10天和20天的生菜叶片中MDA含量分别比对照增加了43.24%和89.70%。同时，处理10天时，可溶性蛋白、可溶性糖和维生素C的含量高于对照；然而，处理20天后，维生素C含量下降了26.53%。这些结果表明，PS-NPs对生菜有显著的氧化应激作用，高浓度的PS-NPs胁迫会对生菜的营养品质产生有害影响。
