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Temperature is a key factor in Micromonas-virus interactions.

David Demory1,2, Laure Arsenieff3, Nathalie Simon3

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Temperature significantly impacts Micromonas algae and prasinovirus interactions. Warmer conditions alter viral infection outcomes, affecting algal populations and ocean processes.

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Area of Science:

  • Marine microbiology
  • Phytoplankton-virus interactions
  • Environmental microbiology

Background:

  • The genus Micromonas is a globally distributed phytoplankton group.
  • Micromonas are frequently infected by prasinoviruses across diverse thermal environments.

Purpose of the Study:

  • To investigate the influence of temperature on the interactions between Micromonas phytoplankton and their lytic viruses.
  • To understand how thermal variations affect host growth, viral stability, and infection dynamics.

Main Methods:

  • Culturing three Micromonas strains (Mic-A, Mic-B, Mic-C) and their corresponding viruses (MicV-A, MicV-B, MicV-C).
  • Measuring host growth and viral stability across a temperature range of 4-32.5°C.
  • Analyzing infection dynamics, lytic cycle kinetics, and viral yield at different temperatures.

Main Results:

  • Micromonas strains showed varying thermal tolerance, with Mic-B exhibiting broader adaptability.
  • MicV-C virus demonstrated greater thermal stability than MicV-A and MicV-B.
  • Temperatures below the optimal growth temperature (Topt) slowed the lytic cycle and reduced viral yield.
  • Infections at temperatures above Topt often did not result in host cell lysis, suggesting altered viral strategies.

Conclusions:

  • Temperature is a critical factor modulating Micromonas-prasinovirus interactions.
  • Altered infection outcomes under thermal stress have significant implications for marine biogeochemistry and microbial evolution.