<br>沉埋植物提取物对铜绿微囊藻生长的剂量影响：从激效到抑制,Ecotoxicology and Environmental Safety

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沉埋植物提取物对铜绿微囊藻生长的剂量影响：从激效到抑制
Ecotoxicology and Environmental Safety ( IF 6.2 ) Pub Date : 2023-11-17 , DOI: 10.1016/j.ecoenv.2023.115703
Xinjie Li ₁ , Wenjing Zhao ₁ , Jiaqi Chen ₁ , Fan Wang ₂

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化感疗法已被证明是控制有害藻华的一种环保方法。沉水植物的化感物质因其生物利用度而吸引了广泛的研究。沉没植物提取物对藻类生长的剂量反应值得进一步研究，以提高生物修复的效率。在本研究中，利用超声酶辅助方法从 Ceratophyllum、Myriophyllum spicatum 和 Vallisneria 中提取化感化学物质。根据细胞生物量和形态、光合参数、活性氧（ROS）、超氧化物歧化酶（SOD）、过氧化氢酶（CAT）和丙二醛（MDA）水平比较低剂量和高剂量提取物对铜绿微囊藻生长的影响。结果表明，3 种沉没的植物提取物在低剂量下表现出激素作用，在高剂量下对藻类生长表现出抑制作用。培养后 48 h 内，铜绿微囊藻的酶活性波动，表明 3 种沉入植物的提取物诱导了不同的氧化反应。用高剂量提取物培养 120 h 后，铜绿微囊藻的生理生化反应显著降低，表明 Ceratophyllum、Myriophyllum spicatum 和 Vallisneria 提取物的化感作用在控制藻华方面的有效性。激效和抑制作用现象证实了沉埋植物提取物的化感物质与铜绿微囊藻之间存在显著的剂量反应关系，这可能归因于化感物质的组成和含量。这些发现强调了生物灭藻剂相对浓度的重要性，并将使其他研究人员在确定植物化感化学物质在水中使用时的安全剂量受益。

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Dosage impact of submerged plants extracts on Microcystis aeruginosa growth: From hormesis to inhibition

Allelopathy has been demonstrated to be an environmentally friendly way to control harmful algal blooms. Allelochemicals of submerged plants have attracted extensive research due to their bioavailability. The dose-response of submerged plant extracts on algae growth is worth further study to improve the efficiency of bioremediation. In this study, the ultrasonic-enzymatic assistance method was utilized to extract allelochemicals from Ceratophyllum, Myriophyllum spicatum, and Vallisneria. The effects of low-dosage and high-dosage extracts on the growth of Microcystis aeruginosa were compared based on cell biomass and morphology, photosynthetic parameters, reactive oxygen species (ROS), superoxide dismutase (SOD), catalase (CAT), and malondialdehyde (MDA) levels. The results showed that the three submerged plant extracts exhibited hormetic effects at low dosages and inhibitory effects at high dosages on algal growth. Within 48 h of cultivation, the enzymatic activities of Microcystis aeruginosa fluctuated, suggesting that the extracts of the three submerged plants induced different oxidative reactions. After 120 h of cultivation with high-dosage extracts, the physiological and biochemical reactions of Microcystis aeruginosa significantly decreased, indicating the effectiveness of the allelopathy of Ceratophyllum, Myriophyllum spicatum, and Vallisneria extracts in controlling algal blooms. The phenomenon of hormesis and inhibition effect confirmed a significant dose-response relationship between the allelochemicals of submerged plant extracts and Microcystis aeruginosa, which could be attributed to the composition and content of allelochemicals. These findings highlight the importance of the relative concentration of the biological algaecide and will benefit other researchers in determining the safe dosage of plant allelochemicals when used in water.

更新日期：2023-11-17

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