纳米TiO2暴露对湿地植物大薸和泽泻光合特征影响的差异
Different Effects of Nano-TiO2 Exposure on the Photosynthesis Characteristics of Wetland Plant Pistia stratiotes and Alisma plantago-aquatica
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摘要: 纳米TiO2独特的理化性质使其成为应用最广泛的纳米材料之一，其进入水环境后对湿地植物产生的效应值得关注。以2类不同生活型的湿地植物大薸和泽泻为研究对象，纳米TiO2浓度梯度设置为0、10、30和250 mg·L-1，在暴露14 d之后分析了光合参数的变化规律，基于植物生物量变化率、各部位Ti元素浓度及光合特征参数，讨论了可能的机制。结果表明，纳米TiO2暴露促进了大薸和泽泻的生物量增长；纳米TiO2暴露后，Ti元素主要富集在植物根部，富集量随浓度升高而增加，大薸植物体内Ti元素浓度明显高于泽泻；高浓度纳米TiO2暴露能够显著改变2种植物的叶孔开放程度、CO2消耗状况及蒸腾速率，但对净光合速率的影响不显著。纳米TiO2暴露对2种植物光合特征影响的差异可能与它们不同的生活型有关。Abstract: The unique physicochemical properties of nano-TiO2 make it become one of the most widely used nanomaterials, and the corresponding wetland plant effect caused by its entry into the water environment is worthy of attention. Two types of life forms of wetland plants, Pistia stratiotes and Alisma plantago-aquatica, were selected as the research objects, and the concentrations of nano-TiO2 were set as 0, 10, 30, and 250 mg·L-1, respectively. After 14 days of exposure, the change trend of photosynthetic parameters of these two plants was analyzed, and the possible mechanisms were also discussed based on the relative change rate of biomass, Ti element concentrations in each tissue of plant and photosynthetic parameters. The results showed that nano-TiO2 exposure promoted the biomass growth of Pistia stratiotes and Alisma plantago-aquatica. The enrichment of Ti mainly occurred in roots and the enrichment quantity increased with the increasing of nano-TiO2concentrations. The concentrations of Ti in plant tissues of Pistia stratiotes were significantly higher than that of Alisma plantago-aquatica. Relatively higher concentrations of nano-TiO2 could significantly change the opening degree of stomas, CO2 consumption amount and transpiration rate of the two plants, but had no significant effect on the net photosynthetic rate. Differences in plant life forms may be the main cause of different effects of nano-TiO2 exposure on the photosynthesis characteristics of these two wetland plants.
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Key words:
- nano-TiO2 /
- wetland plants /
- photosynthesis
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