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Diatoms sense rapid cooling via cytosolic calcium ([Ca2+]cyt) increases, not warming. This calcium signaling aids survival during simultaneous cold and osmotic stress in intertidal zones.

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Area of Science:

  • Marine biology
  • Microalgal physiology
  • Environmental sensing

Background:

  • Diatoms are crucial primary producers in diverse aquatic environments.
  • Intertidal diatoms face significant temperature fluctuations due to tidal cycles.
  • Understanding diatom temperature response mechanisms is key to their ecological success.

Purpose of the Study:

  • Investigate how diatoms perceive and respond to rapid temperature changes.
  • Elucidate the role of calcium signaling in diatom temperature perception.
  • Determine the functional significance of cold-induced signaling in intertidal diatoms.

Main Methods:

  • Utilized Phaeodactylum tricornutum and Thalassiosira pseudonana for experiments.
  • Measured cytosolic calcium ([Ca2+]cyt) levels in response to thermal shocks.
  • Assessed potassium (K+) efflux and mortality under combined cold and hypo-osmotic stress.

Main Results:

  • Rapid cooling induced transient cytosolic calcium ([Ca2+]cyt) elevations in diatoms.
  • No significant [Ca2+]cyt elevation was observed upon rapid warming.
  • Cold shock triggered a calcium-dependent potassium efflux, reducing mortality during hypo-osmotic shock.

Conclusions:

  • Diatoms possess a cold-sensing mechanism involving cytosolic calcium ([Ca2+]cyt) transients.
  • Cold-induced calcium signaling is not directly linked to enhanced cold tolerance.
  • Cross-talk between cold and osmotic signaling pathways likely regulates cell volume and survival in intertidal diatoms.