| 摘要: |
| 为了探明酸性土壤条件下纳米氧化锌（nano-ZnO）长期暴露对蕹菜的生理生态效应，通过盆栽实验，设置7个浓度系列的nano-ZnO，70 d后测定相对叶绿素含量、生长参数和叶绿素荧光参数。结果显示，随nano-ZnO浓度升高，蕹菜相对叶绿素含量和生长参数先缓慢增加后显著下降。nano-ZnO对蕹菜生物量在根部和冠部间的分配无显著影响。相对叶绿素含量与nano-ZnO浓度呈显著负相关（r=-0.879,p<0.001）。在nano-ZnO质量比为160 mg/kg时，光合有效辐射190μmol/(m2·s)诱导的激发能过剩，但过剩激发能可通过热耗散保护机制消耗，以避免发生光损伤。酸性土壤条件下，弱光诱导的蕹菜叶绿素荧光参数对nano-ZnO长期暴露不敏感，但蕹菜的生物量累积易受nano-ZnO长期暴露的影响。 |
| 关键词: 长期暴露 相对叶绿素含量 生物量 光合能力 纳米氧化锌 |
| DOI： |
| 分类号:X835 |
| 文献标识码:B |
| 基金项目:安徽省自然科学基金资助项目（1608085MC62）；安徽省级质量工程大规模在线开放课程（MOOC）示范项目（2018mooc252）；2019年度安徽省教育科学研究基金资助项目（JK19119） |
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| Long term Impact of Nano ZnO Exposure to Growth of Ipomoea Aquatica Forsk and It’s Chlorophyll Fluorescence Indices under Acidic Soil Conditions |
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FU Yi-ting, JI Li, CHEN Yan-song
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College of Life Sciences, Hefei Normal University, Hefei, Anhui 230601, China
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| Abstract: |
| In this study, a pot experiment with contaminated acidic soil by seven levels of nano ZnO for 70 days (the whole vegetative growth phase) was performed to explore the physiological and ecological effects of nano ZnO long term exposure to Ipomoea aquatica Forsk. The relative chlorophyll content, growth characteristics, and chlorophyll fluorescence parameters were determined. The results showed that the relative chlorophyll content and growth parameters slowly increased and then decreased significantly. There was no significant impact of nano ZnO on the biomass distribution between root and shoot of the plant. Relative chlorophyll content negatively correlated with nano ZnO concentration (r=-0.879,p<0.001). Excitation energy induced by a certain light intensity of 190 μmol /(m2·s) in leaf of I. aquaticatreated by 160 mg/kg nano ZnO was excessive, but the excess excitation can be consumed through thermal dissipation with a self adjustment mechanism to avoid light injury. Under acidic soil conditions，Chlorophyll fluorescence indices induced by low light in leaf of I. aquatic were insensitive to nano ZnO long term exposure, but nano ZnO long term exposure significantly affect the biomass accumulation of I. aquatic. |
| Key words: Long term exposure Relative chlorophyll content Biomass Photosynthetic capacity Nano ZnO |
