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1.
Toxins (Basel) ; 13(8)2021 08 23.
Artículo en Inglés | MEDLINE | ID: mdl-34437460

RESUMEN

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 (Fv/Fm) and the effective quantum yield of PSII photochemistry (ΦPSII), 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 Fv/Fm and ΦPSII 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.


Asunto(s)
Aphanizomenon/crecimiento & desarrollo , Cianobacterias/efectos de los fármacos , Cianobacterias/crecimiento & desarrollo , Nodularia/crecimiento & desarrollo , Nostoc/crecimiento & desarrollo , Feromonas/toxicidad , Fotosíntesis/efectos de los fármacos , Aphanizomenon/efectos de los fármacos , Nodularia/efectos de los fármacos , Nostoc/efectos de los fármacos , Fitoplancton/efectos de los fármacos , Fitoplancton/crecimiento & desarrollo , Pigmentos Biológicos , Algas Marinas/química , Ulva/química
2.
Bioresour Technol ; 303: 122875, 2020 May.
Artículo en Inglés | MEDLINE | ID: mdl-32036327

RESUMEN

One of the most efficient and promising technique for biofuel production from microalgae biomass is an anaerobic fermentation. The goal of this work was to investigate changes in the biochemical composition during the long-term cultivation period of 15 green microalgal strains originating from the Baltic Sea. Subsequently, their theoretical methane potential (TMP), which is strictly determined by an algal growth phase and thus physiological state, was established. Based on the full spectrum of changes in the percentage share of lipids, carbohydrates, and proteins in biomass, it was shown that the TMP values differed among strains as well as fluctuated during cultivation. The common trend, i.e., lipids accumulation and proteins breakdown in the late growth phase, was observed for most of the strains; others, however, preferred carbohydrates as storage material. The TMP data obtained herein allows developing a strategy for the design and production of algal biomass biochemically suited for fermentation.


Asunto(s)
Microalgas , Biocombustibles , Biomasa , Fermentación , Metano
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