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© Jean Marc Panaud
Cyanobactérie souche "PCC 9401". Souche de la "Pasteur Culture Collection of Cyanobacteria" conservée à l'état axénique dans l'Unité des Cyanobactéries. La PCC est l'une des Collections spécialisées de l'Institut Pasteur.
Publication : Harmful Algae

The success of the bloom-forming cyanobacteria Planktothrix: Genotypes variability supports variable responses to light and temperature stress

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Harmful Algae - 01 Aug 2022

Harmful Algae 117 (2022) 102285 Available online 2 July 2022 1568-9883/© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by- nc-nd/4.0/).The success of the bloom-forming cyanobacteria Planktothrix: Genotypes variSandra Kim Tiam, Katia Comte, Caroline Dalle, Marine Delagrange, Chakib Djediat, Bertrand Ducos, Charlotte Duval, Kathleen Feilke, Sahima Hamlaoui, Severine Le Manach, Pierre Setif, Claude Yepremian, Benjamin Marie, Diana Kirilovsky, Muriel Gugger, Cecile Bernard

Harmful Algae, Volume 117, August 2022, 102285

Cyanobacterial blooms can modify the dynamic of aquatic ecosystems and have harmful consequences for human activities. Moreover, cyanobacteria can produce a variety of cyanotoxins, including microcystins, but little is known about the role of environmental factors on the prevalence of microcystin producers in the cyanobacterial bloom dynamics. This study aimed to better understand the success of Planktothrix in various environments by unveiling the variety of strategies governing cell responses to sudden changes in light intensity and temperature. The cellular responses (photosynthesis, photoprotection, heat shock response and metabolites synthesis) of four Planktothrix strains to high-light or high-temperature were studied, focusing on how distinct ecotypes (red- or green-pigmented) and microcystin production capability affect cyanobacteria’s ability to cope with such abiotic stimuli. Our results showed that high-light and high-temperature impact different cellular processes and that Planktothrix responses are heterogeneous, specific to each strain and thus, to genotype. The ability of cyano-bacteria to cope with sudden increase in light intensity and temperature was not related to red- or green-pigmented ecotype or microcystin production capability. According to our results, microcystin producers do not cope better to high-light or high-temperature and microcystin content does not increase in response to such stresses.

https://www.sciencedirect.com/science/article/pii/S1568988322001135