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Carbon availability affects nitrogen source utilisation by Hymenoscyphus ericae.

Gwen-Aëlle Grelet1, Andrew A Meharg, Ian J Alexander

  • 1Department of Plant and Soil Science, School of Biological Sciences, University of Aberdeen, St Machar Drive, Aberdeen AB24 3UU, UK. g.grelet@macaulay.ac.uk

Mycological Research
|May 26, 2005
PubMed
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This study reveals that ericoid mycorrhizal fungi like Hymenoscyphus ericae exhibit varied nitrogen utilization strategies based on carbon availability. Fungal strains differ in nitrogen uptake and metabolism, impacting their growth and nutrient use efficiency.

Area of Science:

  • Mycology
  • Plant-Microbe Interactions
  • Soil Science

Background:

  • Ericoid mycorrhizal fungi form symbiotic relationships with plants, playing a crucial role in nutrient cycling.
  • Understanding nitrogen (N) utilization by these fungi is vital for soil fertility and plant health.
  • Hymenoscyphus ericae is a key ericoid mycorrhizal fungus found in various ecosystems.

Purpose of the Study:

  • To investigate the ability of five Hymenoscyphus ericae strains to utilize different nitrogen sources (glutamine, ammonium, nitrate).
  • To determine how carbon (C) availability influences nitrogen utilization and fungal growth.
  • To explore intraspecific variation in N metabolism and transport mechanisms.

Main Methods:

  • Culturing five Hymenoscyphus ericae strains under varying carbon and nitrogen conditions.

Related Experiment Videos

  • Measuring fungal growth, nitrogen uptake, and nitrogen use efficiency.
  • Analyzing changes in media pH to infer nutrient transport and metabolism.

    • Main Results:

    • Fungal growth patterns varied significantly with carbon availability, affecting nitrogen utilization.
    • Under high carbon, growth differences were linked to nitrogen uptake kinetics.
    • Under low carbon, strain differences correlated with nitrogen use efficiency, indicating varied N metabolism.
    • Intraspecific variations in glutamine transporters and metabolic enzymes were observed.

    Conclusions:

    • Carbon availability significantly modulates nitrogen source utilization and metabolic strategies in Hymenoscyphus ericae.
    • Intraspecific variation exists in nitrogen uptake, transport, and metabolism within this fungal species.
    • Findings highlight the dynamic nature of nitrogen utilization by ericoid mycorrhizal fungi in axenic culture.