| Title: | "Changes in Growth, Photosynthesis Performance, Pigments, and Toxin Contents of Bloom-Forming Cyanobacteria after Exposure to Macroalgal Allelochemicals" |
| Author(s): | Budzalek G; Sliwinska-Wilczewska S; Klin M; Wisniewska K; Latala A; Wiktor JM; |
| Address: | "Division of Marine Ecosystems Functioning, Institute of Oceanography, University of Gdansk, Pilsudskiego 46, P-81-378 Gdynia, Poland. Division of Marine Chemistry and Environmental Protection, Institute of Oceanography, University of Gdansk, Pilsudskiego 46, P-81-378 Gdynia, Poland. Department of Marine Ecology, Institute of Oceanology of the Polish Academy of Sciences, Powstancow Warszawy 55, P-81-712 Sopot, Poland" |
| ISSN/ISBN: | 2072-6651 (Electronic) 2072-6651 (Linking) |
| Abstract: | "Macroalgae can directly restrict the growth of various phytoplankton species by releasing allelopathic compounds; therefore, considerable attention should be paid to the allelopathic potential of these organisms against harmful and bloom-forming cyanobacteria. The main aim of this study was to demonstrate for the first time the allelopathic activity of Ulva intestinalis on the growth, the fluorescence parameters: the maximum PSII quantum efficiency (F(v)/F(m)) and the effective quantum yield of PSII photochemistry (PhiPSII), the chlorophyll a (Chl a) and carotenoid (Car) content, and the microcystin-LR (MC-LR) and phenol content of three bloom-forming cyanobacteria, Aphanizomenon sp., Nodularia spumigena, and Nostoc sp. We found both negative and positive allelopathic effects of U. intestinalis on tested cyanobacteria. The study clearly showed that the addition of the filtrate of U. intestinalis significantly inhibited growth, decreased pigment content and F(v)/F(m) and PhiPSII values of N. spumigena and Nostoc sp., and stimulated Aphanizomenon sp. The addition of different concentrations of aqueous extract also stimulated the cyanobacterial growth. It was also shown that the addition of extract obtained from U. intestinalis caused a significant decrease in the MC-LR content in Nostoc sp. cells. Moreover, it the phenol content in N. spumigena cells was increased. On the other hand, the cell-specific phenol content for Aphanizomenon sp. decreased due to the addition of the filtrate. In this work, we demonstrated that the allelopathic effect of U. intestinalis depends on the target species' identity as well as the type of allelopathic method used. The study of the allelopathic Baltic macroalgae may help to identify their possible role as a significant biological factor influencing harmful cyanobacterial blooms in brackish ecosystems" |
| Keywords: | Aphanizomenon/drug effects/*growth & development Cyanobacteria/*drug effects/*growth & development Nodularia/drug effects/*growth & development Nostoc/drug effects/*growth & development Pheromones/*toxicity Photosynthesis/*drug effects Phytoplankton/drug; |
| Notes: | "MedlineBudzalek, Gracjana Sliwinska-Wilczewska, Sylwia Klin, Marek Wisniewska, Kinga Latala, Adam Wiktor, Jozef Maria eng Research Support, Non-U.S. Gov't Switzerland 2021/08/27 Toxins (Basel). 2021 Aug 23; 13(8):589. doi: 10.3390/toxins13080589" |
