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• W3171636540 endingPage "406" @default.
• W3171636540 startingPage "406" @default.
• W3171636540 abstract "Cyanobacteria stand out among phytoplankton when they form massive blooms and produce toxins. Because cyanotoxin genes date to the origin of metazoans, the hypothesis that cyanotoxins function as a defense against herbivory is still debated. Although their primary cellular function might vary, these metabolites could have evolved as an anti-predator response. Here we evaluated the physiological and molecular responses of a saxitoxin-producing Raphidiopsis raciborskii to infochemicals released by the grazer Daphnia gessneri. Induced chemical defenses were evidenced in R. raciborskii as a significant increase in the transcription level of sxt genes, followed by an increase in saxitoxin content when exposed to predator cues. Moreover, cyanobacterial growth decreased, and no significant effects on photosynthesis or morphology were observed. Overall, the induced defense response was accompanied by a trade-off between toxin production and growth. These results shed light on the mechanisms underlying zooplankton–cyanobacteria interactions in aquatic food webs. The widespread occurrence of the cyanobacterium R. raciborskii in freshwater bodies has been attributed to its phenotypic plasticity. Assessing the potential of this species to thrive over interaction filters such as zooplankton grazing pressure can enhance our understanding of its adaptive success." @default.
• W3171636540 created "2021-06-22" @default.
• W3171636540 creator A5021792510 @default.
• W3171636540 creator A5024026514 @default.
• W3171636540 creator A5037439666 @default.
• W3171636540 creator A5043467514 @default.
• W3171636540 creator A5061648790 @default.
• W3171636540 creator A5080589213 @default.
• W3171636540 date "2021-06-08" @default.
• W3171636540 modified "2023-10-05" @default.
• W3171636540 title "Ecophysiological Aspects and sxt Genes Expression Underlying Induced Chemical Defense in STX-Producing Raphidiopsis raciborskii (Cyanobacteria) against the Zooplankter Daphnia gessneri" @default.
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