Changes in Growth, Photosynthesis Performance, Pigments, and Toxin Contents of Bloom-Forming Cyanobacteria after Exposure to Macroalgal Allelochemicals

Budzałek, Gracjana; Śliwińska‐Wilczewska, Sylwia; Klin, Marek; Latała, Adam; Wiktor, Józef

doi:10.3390/toxins13080589

Cited by 1 publication

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References 89 publications

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“…On the other hand, Jin et al (2005) investigated the inhibitory effect of fresh thallus and extract of U. pertusa and U. linza L. on the dinoflagellata Prorocentrum micans Ehrenberg. A recent work indicates that Ulva intestinalis L. also has allelopathic properties (Budzałek et al, 2021a). It was shown that the addition of the cell-free filtrate obtained from U. intestinalis significantly inhibited growth and photosynthetic efficiency of filamentous cyanobacteria Nodularia spumigena Mertens ex Bornet & Flahault and Nostoc sp.…”

Section: Introductionmentioning

confidence: 99%

Allelopathic effect of Ulva intestinalis thallus on selected Baltic cyanobacteria

Budzałek

Śliwińska‐Wilczewska²

2022

AUPCStudiaNaturae

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Macroalgae have been found to produce active allelochemicals that inhibit of growth other organisms that compete with them for light and space. However, their allelopathic activity on Baltic cyanobacteria is still insufficiently recognised. Therefore, this study aimed to demonstrate the allelopathic effects of Baltic macroalga thallus (Ulva intestinalis) on the growth and photosynthetic activity of three bloom-forming cyanobacteria: Aphanizomenon sp., Nodularia spumigena, and Nostoc sp. This study investigated the cell count of the analysed cyanobacteria (N 105 mL-1), the maximum quantum yield of the second photosystem (PSII) in the dark (Fv/Fm), and the real quantum yield of PSII in the light (ΦPSII) (in the control and the experiments). After 7 days of exposure, the following were added: 0.01, 0.05, and 0.1 g mL-1 of U. intestinalis fresh thallus. It was found that thallus obtained from U. intestinalis had no statistically significant effect on the number of cells of the cyanobacterium Aphanizomenon sp. (at 0.05 and 0.1 g mL-1) and Nostoc sp. (at concentrations of 0.01 and 0.05 g mL−1). On the other hand, it was examined a stimulating effect of 0.01 g mL-1 of the fresh thallus on the number of Aphanizomenon sp. cells which constituted 168%, relative to the control. It was shown that the fresh thallus addition resulted in a decrease in the number of N. spumigena cells (45%, 27%, and 46% after addition of 0.01, 0.05, and 0.1 g wet weight mL−1 of fresh thallus, respectively). In experiments with Nostoc sp., the addition of U. intestinalis thallus has been a negative effect on cyanobacterial growth at 0.1 g mL−1 and constituted 97% of control. It was also found, that U. intestinalis had no allelopathic effect on fluorescence parameters of N. spumigena. All tested concentrations of thallus U. intestinalis (0.01, 0.05, and 0.1 g wet weight mL-1) stimulated the values of Fv/Fm or ΦPSII of cyanobacteria Aphanizomenon sp. and Nostoc sp. compared to the control. These studies help define the role of U. intestinalis allelopathy as a biological factor in the distribution of bloom-forming cyanobacteria in the coastal Baltic Sea region.

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Section: Introductionmentioning

confidence: 99%