Root-associated fungi in acid mine drainage-impacted environments

Area of Science:

• Environmental microbiology
• Mycology
• Plant science

Background:

• Acid mine drainage (AMD) creates challenging environments for plant life due to acidic, metal-rich soils.
• Fungi-assisted phytoremediation is a promising strategy to improve plant survival in AMD-affected areas.
• Understanding root-associated fungi is crucial for optimizing this remediation approach.

Purpose of the Study:

• To investigate the diversity and composition of culturable root-associated fungi in plants growing at AMD-impacted and reference sites.
• To characterize fungal associations with different plant species and soil conditions.
• To explore the potential role of these fungi in fungi-assisted phytoremediation of AMD sites.

Main Methods:

• Collected soil and root samples from four plant species at AMD and reference sites.
• Used culture-dependent methods on two media to estimate and isolate culturable fungi.
• Identified fungal taxa and analyzed relationships with soil properties and plant mineral content.

Main Results:

• Fungal colonization increased from bulk soil to roots, especially under AMD stress.
• Ascomycota, particularly dark septate endophytes (DSE), dominated the isolates.
• Phialocephala spp. were associated with plants in harsh AMD soils, while Cadophora spp. were found in less stressful conditions.

Conclusions:

• Edaphic conditions significantly influence root-associated fungal communities in AMD environments.
• Specific fungal-plant associations, like Phialocephala with certain plants, are adapted to AMD stress.
• These findings support the potential of fungi-assisted phytoremediation for AMD site restoration.