Growth and photosynthetic responses of Ochromonas gloeopara to cadmium stress and its capacity to remove cadmium
Growth and photosynthetic responses of Ochromonas gloeopara to cadmium stress and its capacity to remove cadmium
复制标题
圆盘红藻对镉胁迫的生长、光合反应及其除镉能力
DOI：
10.1016/j.envpol.2021.116496
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发表时间：
2021
影响因子：
8.9
通讯作者：
Yang Zhou
中科院分区：
文献类型：
--
作者：
Wu Guangjin;Cheng Jiahui;Wei Junjun;Huang Jing;Sun Yunfei;Zhang Lu;Huang Yuan;Yang Zhou
镉 (Cd) 是水生系统中主要的人为污染物之一。由于镉对所有营养级的物种都有负面影响，水生生境中的群落组成可能会因镉胁迫而发生变化。混合营养原生生物对环境压力的反应尤为重要，因为它们在复杂的浮游生物群落中既充当生产者又充当消费者。在本研究中，我们利用混合营养型Ochromonas gloeoparato研究其生长和对Cd的光合反应，并特别关注初始Cd浓度和营养水平对其去除Cd能力的影响。结果表明，当Cd浓度达到0.5 mg L−1时，生长速度和承载力受到显着抑制，而当Cd浓度达到0.15 mg L−1时，光合作用明显下降。此外，在Cd浓度为0.15、0.5、0.9、1.6和2.0 mg L−1时，O对Cd的去除效率。 韩国分别为 83.2%、77.7%、74.6%、70.1% 和 68.8%。氮的增加对O对Cd的去除能力没有造成显着影响。 gloeopara，但增加磷浓度显着增强了Cd的去除能力。我们的研究结果表明，混合营养型 O. gloeoparas对Cd有较强的耐受性和去除能力，增加磷浓度可提高其去除能力，提示O． gloeopara在减轻水体Cd污染方面具有巨大的潜在应用价值。
Cadmium (Cd) is one of the predominant anthropogenic pollutants in aquatic systems. As Cd has negative effects on species at all trophic levels, the community composition in aquatic habitats can be changed as a result of Cd stress. The response of mixotrophic protists to environmental stressors is particularly important as they act as both producers and consumers in complex planktonic communities. In this study, we used mixotrophicOchromonas gloeoparato study its growth and photosynthetic responses to Cd, and specially focused on the effects of initial Cd concentrations and nutrient levels on its capacity to remove Cd. Results showed that when Cd concentration reached 0.5 mg L−1, the growth rate and carrying capacity were significantly inhibited, whereas the photosynthesis was markedly decreased when Cd concentration reached 0.15 mg L−1. Moreover, under Cd concentration 0.15, 0.5, 0.9, 1.6, and 2.0 mg L−1, the removal efficiencies of Cd byO. gloeoparawere 83.2%, 77.7%, 74.6%, 70.1%, and 68.8%, respectively. The increase of nitrogen did not cause significant effect on the removal capacity of Cd byO. gloeopara, but increased concentration of phosphorus significantly enhanced the removal capacity of Cd. Our findings indicated that the mixotrophicO. gloeoparahas strong tolerance and capacity to remove Cd, and increasing concentration of phosphorus can increase its removal capacity, suggesting thatO. gloeoparahas great potential application value in mitigating Cd pollution in waters.