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Simulated acid rain affects birch leaf endophyte populations.

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This summary is machine-generated.

Simulated acid rain affected endophyte occurrence in mountain birch leaves. Lower pH treatments reduced endophyte numbers, but species composition remained unchanged.

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Area of Science:

  • Plant Pathology
  • Environmental Science
  • Mycology

Background:

  • Endophytes are microorganisms living within plant tissues, often with symbiotic relationships.
  • Mountain birch (Betula pubescens var. tortuosa) is a key species in subarctic ecosystems.
  • Understanding environmental impacts on endophyte communities is crucial for ecosystem health.

Purpose of the Study:

  • To investigate the impact of simulated acid rain on the occurrence and diversity of endophytic fungi in mountain birch leaves.
  • To assess how different acidity levels (pH 3 and pH 4) influence endophyte colonization and species composition.

Main Methods:

  • Field experiment with simulated acid rain treatments (pH 3, pH 4) applied to mountain birch.
  • Leaf sampling conducted in summer, followed by surface sterilization and isolation of endophytes on malt extract agar.
  • Quantification and identification of isolated endophyte colonies, including dominant species like Fusicladium anamorph of Venturia sp.

Main Results:

  • Acid rain treatment at pH 3 significantly reduced the total number of isolated endophytes by approximately 25% in August.
  • Endophyte isolation and species richness increased from July to August.
  • Endophyte occurrence varied with leaf position (midrib base) and branch height (lower branches).

Conclusions:

  • Simulated acid rain, particularly at lower pH, can negatively impact the abundance of endophytic fungi in mountain birch leaves.
  • While acid rain affects endophyte numbers, it does not significantly alter the species composition of these microbial communities.
  • Further research is needed to understand the long-term ecological consequences of acid rain on plant-endophyte interactions in subarctic environments.