Physiological and morphological plasticity in response to nitrogen availability of a yeast widely distributed in the open ocean

Poppy Diver, Ben A. Ward, Michael Cunliffe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Yeasts are prevalent in the open ocean, yet we have limited understanding of their ecophysiological adaptations, including their response to nitrogen availability, which can have a major role in determining the ecological potential of other planktonic microbes. In this study, we characterized the nitrogen uptake capabilities and growth responses of marine-occurring yeasts. Yeast isolates from the North Atlantic Ocean were screened for growth on diverse nitrogen substrates, and across a concentration gradient of three environmentally relevant nitrogen substrates: nitrate, ammonium, and urea. Three strains grew with enriched nitrate while two did not, demonstrating that nitrate utilization is present but not universal in marine yeasts, consistent with existing knowledge of nonmarine yeast strains. Naganishia diffluens MBA_F0213 modified the key functional trait of cell size in response to nitrogen concentration, suggesting yeast cell morphology changes along chemical gradients in the marine environment. Meta-analysis of the reference DNA barcode in public databases revealed that the genus Naganishia has a global ocean distribution, strengthening the environmental applicability of the culture-based observations. This study provides novel quantitative understanding of the ecophysiological and morphological responses of marine-derived yeasts to variable nitrogen availability in vitro, providing insight into the functional ecology of yeasts within pelagic open ocean environments.

Original languageEnglish
Article numberfiae053
JournalFEMS Microbiology Ecology
Volume100
Issue number5
DOIs
Publication statusPublished - 1 May 2024

ASJC Scopus subject areas

  • Microbiology
  • Ecology
  • Applied Microbiology and Biotechnology

Keywords

  • functional traits
  • marine fungi
  • marine yeast
  • nitrogen
  • plankton ecology
  • Nitrates/metabolism
  • Urea/metabolism
  • Atlantic Ocean
  • Yeasts/metabolism
  • Seawater/microbiology
  • Nitrogen/metabolism
  • Ammonium Compounds/metabolism

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