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J Environ Manage

Title:		"Effects of dissolved organic matter derived from two herbs on the growth, physiology, and physico-chemical characteristics of four bloom-forming algae species"
Author(s):		Xiang R; Liu T; Chu Z; Wang X; Zheng B; Jia H;
Address:		"School of Environment, Tsinghua University, Beijing, 100084, China; State Key Laboratory of Environmental Criteria and Risk Assessment, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. State Key Laboratory of Environmental Criteria and Risk Assessment, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. State Key Laboratory of Environmental Criteria and Risk Assessment, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. Electronic address: zhengbinghui@craes.org.cn. School of Environment, Tsinghua University, Beijing, 100084, China. Electronic address: jhf@tsinghua.edu.cn"
Journal Title:		J Environ Manage
Year:		2023
Volume:		20230302
Issue:
Page Number:		117559 -
DOI:		10.1016/j.jenvman.2023.117559
ISSN/ISBN:		1095-8630 (Electronic) 0301-4797 (Linking)
Abstract:		"While algal blooms occur frequently in lakes and reservoirs worldwide, the effects of dissolved organic matter (DOM) from lakeside and riparian zones on bloom formation are not well understood. In this study, we characterized the molecular composition of DOM from Cynodon dactylon (L.) Pers. (CD-DOM) and Xanthium sibiricum Patrin ex Widder (XS-DOM) and assessed their effects on the growth, physiology, volatile organic compounds (VOCs), and stable carbon isotope in four bloom-forming algae species (Microcystis aeruginosa, Anabaena sp., Chlamydomonas sp., and Peridiniopsis sp.). Stable carbon isotope analysis showed that the four species were affected by DOM. Both DOM types increased the cell biomass, polysaccharide and protein contents, chlorophyll fluorescence parameter values, and VOCs release of Anabaena sp., Chlamydomonas sp. and Microcystis aeruginosa, suggesting that DOM stimulated algal growth by increasing nutrient sources, photosynthetic efficiency, and stress tolerance. And in general, these three strains exhibited better growth at higher DOM concentrations. However, DOM treatment inhibited the growth of Peridiniopsis sp., as indicated by the increases in reactive oxygen species, damage in photosystem II reaction centers, and blockage in electron transport. Fluorescence analysis showed that tryptophan-like compounds were the main DOM components that affected algal growth. Molecular-level analysis suggested that unsaturated aliphatic compounds may be the most important DOM components. The findings indicate that CD-DOM and XS-DOM promote the blue-green algal blooms formation and thus should be considered in the management of natural water quality"
Keywords:		Dissolved Organic Matter *Cyanobacteria *Microcystis/chemistry/metabolism Eutrophication *Volatile Organic Compounds Carbon Isotopes/metabolism Blue-green algae Dinoflagellate Freshwater blooms Physico-chemical characteristics;
Notes:		"MedlineXiang, Rong Liu, Tingting Chu, Zhaosheng Wang, Xing Zheng, Binghui Jia, Haifeng eng England 2023/03/04 J Environ Manage. 2023 Jun 15; 336:117559. doi: 10.1016/j.jenvman.2023.117559. Epub 2023 Mar 2"