Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; Center for Ecological Research (CER), Kyoto University, Otsu, Shiga 520-2113, Japan.
Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
Sci Total Environ. 2019 Mar 10;655:823-830. doi: 10.1016/j.scitotenv.2018.11.296. Epub 2018 Nov 22.
This study investigated the allelopathic effects of Microcystis aeruginosa (M. aeruginosa) extracts and exudates on the physiological responses, photosynthetic activity, and microbial structure of biofilms on leaves of Vallisneria natans (V. natans). By measuring physiological and photosynthetic indices, the results showed that M. aeruginosa allelochemicals inhibited photosynthesis, oxidative stress and antioxidant system stress response in the biofilms of V. natans leaves. Multifractal analysis found that the surface topography of V. natans leaves was altered due to the allelochemicals found in M. aeruginosa. Microbial diversity on the leaves was analyzed using high-throughput sequencing, and the results showed that M. aeruginosa exudates had a stronger effects on the microbial community structure of biofilms compared to extracts. These findings highlight how cyanobacterial allelochemicals induce negative effects on submerged macrophytes.
本研究调查了铜绿微囊藻（M. aeruginosa）提取物和分泌物对苦草（V. natans）叶片生物膜生理响应、光合作用和微生物结构的化感作用。通过测量生理和光合指标，结果表明铜绿微囊藻化感物质抑制了苦草叶片生物膜的光合作用、氧化应激和抗氧化系统应激反应。多重分形分析发现，由于铜绿微囊藻中的化感物质，苦草叶片的表面形貌发生了改变。利用高通量测序分析叶片上的微生物多样性，结果表明与提取物相比，铜绿微囊藻分泌物对生物膜微生物群落结构的影响更强。这些发现强调了蓝藻化感物质如何对沉水植物产生负面影响。
