The Physiological Response of Salix matsudana for Water Pollution by 2,4-Dinitrophenol.

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Toxics Pub Date : 2024-10-20 DOI:10.3390/toxics12100763
Huicheng Xie, Yikang Fu, Degang Fu, Dengfeng Lin, Huimin Zhou, Guilong Fu, Hui Li, Jinxin Liu, Xiuguo Zheng, Kun Li
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Abstract

In this study, the effects of different concentrations of 2,4-dinitrophenol (2,4-DNP) stress on physiological parameters, as well as the uptake and removal of 2,4-DNP in Salix matsudana, were investigated using hydroponic simulation experiments to explore the potential of the use of Salix matsudana in the phytoremediation of wastewater polluted by 2,4-DNP. The results showed that PN (net photosynthetic rate), Tr (transpiration rate), Gs (stomatal conductance), Ls (stomatal limitation value), Fv/Fm (maximal quantum yield of PSII photochemistry), and qp (photochemical quenching coefficient) of Salix matsudana seedlings showed an overall decreasing trend, while Ci (intercellular CO2 concentration) showed an increasing trend with the increase in 2,4-DNP concentration. The net photosynthetic rate and intercellular carbon dioxide concentration showed an opposite trend in the leaves with the increase in 2,4-DNP stress concentration, and the inhibition of net photosynthesis by 2,4-DNP on Salix matsudana seedlings was mainly based on non-stomatal factors. In the 15 d incubation experiment, the values of SOD (superoxide dismutase), POD (peroxidase), and CAT (catalase) indexes were higher at low concentrations of 2,4-DNP stress, and all three enzymes reached their maximum values at 10 mg L-1 of 2,4-DNP and then decreased. Salix matsudana seedlings could tolerate 2,4-DNP stress well, which did not exceed 20 mg L-1. The toxicity of 2,4-DNP solution was significantly reduced after purification by Salix matsudana seedlings. The removal rate of 2,4-DNP was higher than 80% in each treatment group by Salix matsudana purified after 15 days. When the concentration of 2,4-DNP reached 20 mg L-1, the contents of MDA (malonicdialdehyde) were 55.62 mmol g-1, and the values of REC (relative conductivity) and LD (leaf damage) were 63.51% and 59.93%, respectively. The structure and function of the cell membrane in leaves were seriously damaged. With the increase in 2,4-DNP concentration, the removal of 2,4-DNP by Salix matsudana seedlings showed a decreasing trend. When the 2,4-DNP concentration was 5 mg L-1, the highest removal rate of 2,4-DNP by Salix matsudana seedlings was 95.98%, while when the 2,4-DNP concentration was 20 mg L-1, the highest removal rate was 86.76%. It is noted that the suitable, recommended concentration for the phytoremediation of 2,4-DNP contamination by Salix matsudana seedlings is between 8.81 and 13.78 mg L-1.

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沙柳对 2,4-二硝基酚水污染的生理反应
本研究利用水培模拟实验研究了不同浓度的2,4-二硝基苯酚(2,4-DNP)胁迫对沙柳生理参数的影响,以及沙柳对2,4-DNP的吸收和去除情况,以探讨沙柳在2,4-DNP污染废水的植物修复中的应用潜力。结果表明,随着 2,4-DNP 浓度的增加,沙柳幼苗的 PN(净光合速率)、Tr(蒸腾速率)、Gs(气孔导度)、Ls(气孔限制值)、Fv/Fm(PSII 光化学最大量子产率)和 qp(光化学淬灭系数)总体呈下降趋势,而 Ci(胞间 CO2 浓度)则呈上升趋势。随着 2,4-DNP 胁迫浓度的增加,叶片的净光合速率和细胞间二氧化碳浓度呈现出相反的趋势,2,4-DNP 对沙柳幼苗净光合的抑制主要基于非气孔因素。在 15 d 的培养实验中,2,4-DNP 胁迫浓度较低时,SOD(超氧化物歧化酶)、POD(过氧化物酶)和 CAT(过氧化氢酶)指标值较高,当 2,4-DNP 浓度为 10 mg L-1 时,三种酶的指标值均达到最大值,然后下降。沙柳幼苗对 2,4-DNP 胁迫的耐受性较好,不超过 20 毫克/升。沙柳幼苗净化 2,4-DNP 溶液后,其毒性明显降低。15 天后,经松叶沙柳净化的 2,4-DNP溶液对各处理组的去除率均高于 80%。当 2,4-DNP 浓度达到 20 mg L-1 时,MDA(丙二醛)含量为 55.62 mmol g-1,REC(相对电导率)和 LD(叶片损伤)值分别为 63.51% 和 59.93%。叶片细胞膜的结构和功能受到严重破坏。随着 2,4-DNP 浓度的增加,沙柳幼苗对 2,4-DNP 的去除率呈下降趋势。当 2,4-DNP 浓度为 5 mg L-1 时,沙柳幼苗对 2,4-DNP 的去除率最高,为 95.98%;当 2,4-DNP 浓度为 20 mg L-1 时,去除率最高,为 86.76%。由此可见,沙柳幼苗对 2,4-DNP 污染进行植物修复的合适推荐浓度为 8.81 至 13.78 毫克/升。
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来源期刊
Toxics
Toxics Chemical Engineering-Chemical Health and Safety
CiteScore
4.50
自引率
10.90%
发文量
681
审稿时长
6 weeks
期刊介绍: The Journal accepts papers describing work that furthers our understanding of the exposure, effects, and risks of chemicals and materials in humans and the natural environment as well as approaches to assess and/or manage the toxicological and ecotoxicological risks of chemicals and materials. The journal covers a wide range of toxic substances, including metals, pesticides, pharmaceuticals, biocides, nanomaterials, and polymers such as micro- and mesoplastics. Toxics accepts papers covering: The occurrence, transport, and fate of chemicals and materials in different systems (e.g., food, air, water, soil); Exposure of humans and the environment to toxic chemicals and materials as well as modelling and experimental approaches for characterizing the exposure in, e.g., water, air, soil, food, and consumer products; Uptake, metabolism, and effects of chemicals and materials in a wide range of systems including in-vitro toxicological assays, aquatic and terrestrial organisms and ecosystems, model mammalian systems, and humans; Approaches to assess the risks of chemicals and materials to humans and the environment; Methodologies to eliminate or reduce the exposure of humans and the environment to toxic chemicals and materials.
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