Jiahui Lin, Jie Liu, Hui Xing, Sijia Chen, Yiting Nan, Junming He, Bo Hu, Yanfang Wei, Peiyong Guo
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引用次数: 0
摘要
悬浮颗粒物（SPM）是自然水环境的重要组成部分，可作为多种污染物的载体对水生生物产生影响。本研究考察了晋江河口水体悬浮微粒对典型淡水藻类（焦绿球藻）生理、生化和光合特性的影响。结果表明，在不同浓度的SPM处理下，焦绿藻的超氧化物歧化酶（SOD）、过氧化氢酶（CAT）活性和丙二醛（MDA）含量增加，但可溶性蛋白质含量降低。不同粒径的 SPM 对褐藻 SOD 的影响较小，但对 CAT 和 MDA 以及可溶性蛋白质含量有促进作用。在光合作用活性方面，高浓度（70、90 毫克/升）、小粒径（0-75、75-120 微米）的 SPM 对拟肾上腺叶绿素 a 含量的影响更大。此外，不同浓度的 SPM 对 PS II 潜在光合作用活性（Fv/F0）和 PS II 最大量子产率（Fv/Fm）无明显影响，但对初始斜率（α）、最大光合速率（ETRmax）和半光饱和点（Ik）的抑制作用随 SPM 浓度的增加而增加。在不同粒径的 SPM 存在下，C. pyrenoidosa 的 Fv/F0、ETRmax 和 Ik 在受到抑制后有一定程度的恢复。
Effect of suspended particulate matter on physiological, biochemical and photosynthetic characteristics of Chlorella pyrenoidosa in the Jinjiang Estuary (Fujian, China).
Suspended particulate matter (SPM), an important component of the natural water environment, can act as a carrier of many pollutants that affect aquatic organisms. In the present study, the effect of SPM obtained from Jinjiang Estuary on the physiological, biochemical, and photosynthetic properties of typical freshwater algae (Chlorella pyrenoidosa) was investigated. The results showed that under different concentrations of SPM treatment, the superoxide dismutase (SOD), catalase (CAT) activities, and malondialdehyde (MDA) content of C. pyrenoidosa increased, but the soluble protein content decreased. SPM with different particle sizes had less effect on SOD of C. pyrenoidosa, but showed a promoting effect on CAT and MDA as well as soluble protein content. In terms of photosynthetic activity, high concentrations (70, 90 mg/L) and small particle sizes (0-75, 75-120 μm) of SPM had a greater effect on the chlorophyll a content of C. pyrenoidosa. In addition, different concentrations of SPM had no significant effect on the potential photosynthetic activity of PS II (Fv/F0) and the maximum quantum yield of PS II (Fv/Fm), but the inhibition of the initial slope (alpha), the maximum photosynthetic rate (ETRmax) and the semi-light saturation point (Ik) increased with the increase of SPM concentration. Fv/F0, ETRmax, and Ik of C. pyrenoidosa showed some degree of recovery after inhibition in the presence of SPM of different particle sizes.
期刊介绍：
Ecotoxicology is an international journal devoted to the publication of fundamental research on the effects of toxic chemicals on populations, communities and terrestrial, freshwater and marine ecosystems. It aims to elucidate mechanisms and processes whereby chemicals exert their effects on ecosystems and the impact caused at the population or community level. The journal is not biased with respect to taxon or biome, and papers that indicate possible new approaches to regulation and control of toxic chemicals and those aiding in formulating ways of conserving threatened species are particularly welcome. Studies on individuals should demonstrate linkage to population effects in clear and quantitative ways. Laboratory studies must show a clear linkage to specific field situations. The journal includes not only original research papers but technical notes and review articles, both invited and submitted. A strong, broadly based editorial board ensures as wide an international coverage as possible.
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