Fungus-initiated catalytic reactions at hyphal-mineral interfaces drive iron redox cycling and biomineralization

Guang Hui Yu*, Zhi Lai Chi, H. Henry Teng, Hai Liang Dong, Andreas Kappler, Michael R. Gillings, Matthew L. Polizzotto, Cong Qiang Liu, Yong Guan Zhu

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The ability of fungi to weather a wide range of minerals influences plant nutrition and enhances global biogeochemical cycles of life-essential elements. The fungus-mineral interface plays a key role in weathering, but the specific mechanisms underlying these processes remain poorly understood. Here, we examined fungal-mineral weathering using hematite and Trichoderma guizhouense. We showed that hematite dissolution increased over cultivation time, with the formation of secondary minerals up to ∼3000 µm−2 at the interfaces after 66 h cultivation. Of the hematite associated with hyphae, approximately 15% was converted to the secondary mineral ferrihydrite. Importantly, superoxide radicals were detected at the hyphal tips and along the whole hyphae. During cultivation, a high concentration (∼1000 nM) of hydroxyl radical was also detected. Synchrotron radiation based spectromicroscopies at fungus-mineral interfaces suggest that fungus hyphae alter the local redox state of iron and thus are redox-active. These findings indicate that fungus-initiated catalytic reactions occur at hyphal-mineral interfaces, in view of the fact that superoxide does not diffuse far from the site of formation. Furthermore, these results also suggest that the catalytic reactions may serve as a new strategy for microbial iron uptake. Together, these findings constitute a significant step forward in understanding the ways that fungi make minerals available to biological systems.

Original languageEnglish
Pages (from-to)192-203
Number of pages12
JournalGeochimica et Cosmochimica Acta
Volume260
DOIs
Publication statusPublished - 1 Sep 2019

Keywords

  • biocatalysis
  • fungi weathering
  • interfacial process
  • mineral dissolution
  • superoxides
  • synchrotron radiation

Fingerprint Dive into the research topics of 'Fungus-initiated catalytic reactions at hyphal-mineral interfaces drive iron redox cycling and biomineralization'. Together they form a unique fingerprint.

Cite this