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期刊名称: Environmental Toxicology
Volume:27    Issue:4        Page:229-237

Effects of streptomycin on growth of algae Chlorella vulgaris and Microcystis aeruginosa期刊论文

作者: Qian Haifeng Li Jingjing Pan Xiangjie Sun Zhengqi Ye Chengbin

页码: 229-237
被引频次: 77
出版者: Wiley Subscription Services, Inc., A Wiley Company,WILEY-BLACKWELL
期刊名称: Environmental Toxicology
ISSN: 1520-4081
卷期: Volume:27    Issue:4
语言: English
摘要: Streptomycin is a common contaminant in a variety of industrial and agricultural wastewaters. The available information on the potential toxicity of streptomycin of fresh algae implicated in the treatment of biological wastewater is extremely limited. The objective of this study was to evaluate the effects of streptomycin on physiological indices and photosynthesis‐related gene transcription. The results of short‐term batch bioassays indicated that streptomycin was more sensitive to cyanobacteria than to green algae. The EC50 of streptomycin in Microcystis aeruginosa and Chlorella vulgaris were 0.28 and 20.08 mg L−1, respectively. These selected streptomycin concentrations inhibited algal cell growth and decreased chlorophyll or phycocyanobilin content. Streptomycin also destroyed the overall membrane system, which was speculated from malondialdehyde (MDA) content and electrolyte leakage increasing after streptomycin exposure. Two algae were induced to increase their antioxidant enzyme activities to withstand streptomycin. However, the balance between oxidant substance and antioxidant enzyme was broken, because reactive oxygen species (ROS) content simultaneously increased. Streptomycin inhibited photosynthesis‐related gene transcription in C. vulgaris and M. aeruginosa. Transcript levels of psaB, psbA, and rbcL in C. vulgaris decreased to only 14.5%, 32.2%, and 9.3% of the control, respectively. Similarly, the transcript levels of psaB, psbD, and rbcL in M. aeruginosa decreased markedly in the present of streptomycin. The transcription of these genes was 12.4%, 26.1%, and 28.4% of the control after 0.1 mg L−1 streptomycin exposure, respectively. Our results demonstrate that streptomycin is toxic to fresh algae, affects photosynthesis‐related gene transcription, and blocks electron transport and ROS overproduction. © 2010 Wiley Periodicals, Inc. Environ Toxicol, 2012.
相关主题: antioxidant enzyme, real‐time PCR, Microcystis aeruginosa, Chlorella vulgaris, Real-time PCR, Antioxidant enzyme, OXIDATIVE STRESS, CHLOROPHYLL FLUORESCENCE, ENVIRONMENT, WATER RESOURCES, ANTIBACTERIAL AGENTS, VETERINARY ANTIBIOTICS, COPPER, real-time PCR, O-2 PHOTOREDUCTION, ENVIRONMENTAL SCIENCES, WASTE-WATER, PHOTOSYSTEM-II, GENE-EXPRESSION, TOXICOLOGY, Chlorella vulgaris - metabolism, Malondialdehyde - metabolism, Electron Transport, Microcystis - metabolism, Reactive Oxygen Species - metabolism, Oxidation-Reduction, Streptomycin - pharmacology, Microcystis - growth & development, Chlorella vulgaris - growth & development, Malondialdehyde - analysis, Chlorophyll - analysis, Algal Proteins - genetics, Chlorella vulgaris - drug effects, Transcription, Genetic, Anti-Bacterial Agents - pharmacology, Microcystis - drug effects, Photosynthesis,






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