Cited by 60Aquatic Ecosystems and Phytoplankton DynamicsMarine and coastal ecosystemsPhotosynthetic Processes and Mechanisms

Synechococcus and Prochlorococcus cell death induced by UV radiation and the penetration of lethal UVR in the Mediterranean Sea

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Llabrés, M, Agustí, S, Alonso-Laita, P, Herndl, GJ·2010·Marine Ecology Progress Series

Abstract

Irradiation experiments performed on natural communities of picocyanobacteria from the southwest Mediterranean Sea indicated that natural levels of solar ultraviolet radiation (UVR: 280 to 400 nm) induced important cell death in Prochlorococcus sp., although Synechococcus sp.appeared to be highly resistant.In the treatments where UVB radiation (UVBR, 280 to 315 nm) was excluded, Prochlorococcus also experienced high cell death with short half-life times of 3.01 ± 0.1 SE (h), showing the contribution of UVA radiation (UVAR, 315 to 400 nm) and photosynthetically active radiation (PAR, 400 to 700 nm) to Prochlorococcus cell death.Underwater radiometric measurements conducted during the cruise indicated that penetration of UVR was significant in the Mediterranean waters studied, with minimum diffuse attenuation coefficients of 0.165 and 0.071 m -1 for 313 and 380 nm, respectively.The lethal UV doses required to decrease the picocyanobacteria populations by half, UVLRD 50 , calculated experimentally, were related to underwater UVR penetration in the Mediterranean Sea measured during the cruise.By calculating (from incident irradiances and UVR penetration) the daily UV doses at different depths in the water column, we found that, for sunny days, experimental Prochlorococcus LRD 50 (187 kJ m -2 ) could reach from 10 to 26 m depth.For Synechococcus, however, the depth receiving daily UVLRD 50 (1375 kJ m -2 ) was always shallower, above 5 m depth.The differential sensitivity of the 2 genera and the UV transparency of the Mediterranean Sea suggest that solar radiation could be an important factor influencing the dynamics and distribution of cyanobacterial populations in the surface waters of this oligotrophic sea.

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Crossref · 10.3354/meps08332

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  • UVR is a highly effective carcinogenic exogenous agent that interacts with DNA, alters genome integrity, and may affect normal life processes from prokaryotes to mammals.

    “which is one of the most effective and carcinogenic exogenous agents that can interact with DNA and alter the genome integrity and may affect the normal life processes of all organisms ranging from prokaryotes to mammals [2–10].”

    From Molecular Mechanisms of Ultraviolet Radiation‐Induced DNA Damage and Repair (2010) · cites this paper as [10]

    The Introduction (page not supplied) says UVR damages DNA and can inhibit phytoplankton production; the Discussion reports UVR-induced mortality in Mediterranean picocyanobacteria. The paper does not establish that UVR is carcinogenic or extend these effects to all organisms from prokaryotes to mammals. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Solar UV radiation causes diverse biological effects, including changes to protein and DNA structure, chronic depression of physiological processes, and acute stress that reduces growth, cell division, pigment bleaching, N2 fixation, energy production, or photosynthesis.

    “Solar UV radiation is responsible for a wide range of biological effects including alteration in the structure of protein, DNA, and many other biologically important molecules, chronic depression of key physiological processes, and acute physiological stress leading to either reduction in growth and cell division, pigment bleaching, N2 fixation, energy production, or photoinhibition of photosynthe”

    From Molecular Mechanisms of Ultraviolet Radiation‐Induced DNA Damage and Repair (2010) · cites this paper as [10]

    The Introduction (page not provided) describes UV-induced DNA damage, inhibition of primary production, pigment degradation, and changes in nitrogen metabolism; the Discussion reports UV-induced cell mortality. The copy does not support the more specific claims about altered protein structure, chronic versus acute effects, N2 fixation, or reduced energy production. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

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Authors
Llabrés, M., Agustí, S., Alonso-Laita, P., & Herndl, G.
Affiliations
  • Mediterranean Institute for Advanced Studies (ES)
  • Consejo Superior de Investigaciones Científicas (ES)
Venue
Marine Ecology Progress Series
Published
2010-01-28
Volume
399
Pages
27-37
ISSN
  • 0171-8630 (ISSN-L)
  • 1616-1599
OpenAlex
W2075001194
Cited by
60
References
29
Citations by year
2026: 2 · 2025: 3 · 2024: 1 · 2023: 1 · 2022: 3 · 2021: 2 · 2020: 6 · 2019: 1 · 2018: 5 · 2017: 2 · 2016: 2 · 2015: 7 · 2014: 8 · 2013: 5 · 2012: 6
FWCI
3.05
Type
journal article
Language
en
Open access
Locations
  • Marine Ecology Progress Series (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, other-oa)
Funders
  • European Commission
  • Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
Keywords
Prochlorococcus, Synechococcus, picocyanobacteria, ultraviolet radiation, cell death, UV penetration, UV dose, UVA, UV-B radiation, photosynthetically active radiation, Mediterranean Sea, oligotrophic waters

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