Effects of UV Radiation on the Chlorophyte Micromonas polaris Host–Virus Interactions and MpoV-45T Virus Infectivity

Microorganisms

Charlotte Eich¹  Sven B. E. H. Pont¹  Corina P. D. Brussaard¹ 

[1] Department of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research, 1797 SZ t’Horntje, The Netherlands;

关键词: arctic;    Micromonas polaris;    UV-AB;    UV-C;    virus decay;    virus production;   

DOI  :  10.3390/microorganisms9122429

来源: DOAJ

【 摘 要 】

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 overcome without 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.

【 授权许可】

Unknown