| 聚苯乙烯纳米塑料对大蒜生长生理的影响 |
| 摘要点击 6113 全文点击 863 投稿时间：2021-10-05 修订日期：2021-12-13 |
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| 中文关键词 金乡大蒜 纳米塑料 生长生理 抗氧化酶 营养品质 |
| 英文关键词 Allium sativum L. nanoplastics physiology antioxidant enzymes nutritional quality |
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| 中文摘要 |
| 自然环境中的微/纳米塑料污染日趋严重，但纳米塑料对农作物生长的潜在影响尚不清楚.通过营养液培养方式，探讨了粒径为80 nm的聚苯乙烯纳米塑料（polystyrene nanoplastics，PS-NPs）对金乡大蒜（Allium sativum L.）叶绿素含量、抗氧化性能和营养品质的影响.结果显示，添加PS-NPs处理的大蒜，其叶片叶绿素含量均显著低于对照组，叶绿素的合成受到抑制.大蒜叶片SOD、APX活性和脯氨酸含量随着PS-NPs质量浓度的增加呈先升高后降低的趋势.10 d处理时大蒜叶片POD活性随PS-NPs质量浓度的增加而上升，但在20 d处理时，各处理组POD活性均受到抑制.大蒜叶片MDA质量摩尔浓度随PS-NPs质量浓度的增加而增加，在ρ（PS-NPs）为100 mg·L-1处理下，10 d和20 d处理时其含量相比对照分别增加43.24%和89.70%.同时，经ρ（PS-NPs）为100 mg·L-1胁迫处理10 d后，大蒜叶片可溶性蛋白质、可溶性糖和维生素C含量均高于对照组，但20 d后，维生素C含量较对照则降低了26.53%.以上结果表明PS-NPs能对大蒜产生较为显著的氧化胁迫效应，且较高质量浓度的PS-NPs胁迫会对大蒜叶片的营养品质产生一定的影响. |
| 英文摘要 |
| 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 Allium sativum L. were explored via hydroponic culture. The results showed that the chlorophyll contents in leaves of A. sativum 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 A. sativum initially increased but then decreased with the increase in ρ(PS-NPs). The activity of guaiacol peroxidase (POD) increased with the increase in ρ(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 ρ(PS-NPs). When ρ(PS-NPs) increased to 100 mg·L-1, the MDA content in leaves of A. sativum 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 A. sativum, and a high concentration of PS-NPs stress would have deleterious effects on the nutritional quality of A. sativum. |
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