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Effects of UV radiation on the chlorophyte Micromonas polaris host–virus interactions and MpoV-45T virus infectivity
Eich, C.; Pont, S.B.E.H.; Brussaard, C.P.D. (2021). Effects of UV radiation on the chlorophyte Micromonas polaris host–virus interactions and MpoV-45T virus infectivity. Microorganisms 9(12): 2429. https://dx.doi.org/10.3390/microorganisms9122429
In: Microorganisms. MDPI: Basel. ISSN 2076-2607, meer
Peer reviewed article  

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Trefwoord
    Micromonas polaris Simon, Foulon & Marin, 2017 [WoRMS]
Author keywords
    arctic; Micromonas polaris; UV-AB; UV-C; virus decay; virus production

Auteurs  Top 
  • Eich, C.
  • Pont, S.B.E.H.
  • Brussaard, C.P.D., meer

Abstract

    Polar seas are under threat of enhanced UV-radiation as well as increasing shipping activities. Considering the ecological importance of marine viruses, it is timely to study the impact of UV-AB on Arctic phytoplankton host–virus interactions and also test the efficacy of ballast water (BW) UV-C treatment on virus infectivity. This study examined the effects of:(i) ecologically relevant doses of UV-AB radiation on Micromonas polaris RCC2258 and its virus MpoV-45T, and (ii) UV-C radiation (doses 25–800 mJ cm−2) on MpoV-45T and other temperate algal viruses. Total UV-AB exposure was 6, 12, 28 and 48 h (during the light periods, over 72 h total). Strongest reduction in algal growth and photosynthetic efficiency occurred for 28 and 48 h UV-AB treatments, and consequently the virus production rates and burst sizes were reduced by more than half (compared with PAR-only controls). For the shorter UV-AB exposed cultures, negative effects by UV (especially Fv/Fm) were overcomewithout impacting virus proliferation. To obtain the BW desired log −4 reduction in virus infectivity, a UV-C dose of at least 400 mJ cm−2 was needed for MpoV-45T and the temperate algal viruses. This is higher than the commonly used dose of 300 mJ cm−2 in BW treatment. View Full-Text


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