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

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	Fungus-initiated catalytic reactions at hyphal-mineral interfaces drive iron redox cycling and biomineralization
	Yu, Guang-Hui ; Chi, Zhi-Lai ; Teng, H. Henry ; Dong, Hai-Liang ; Kappler, Andreas ; Gillings, Michael R.; Polizzotto, Matthew L.; Liu, Cong-Qiang ; Zhu, Yong-Guan
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2019-09-01
卷号	260 页码:192-203
关键词	Biocatalysis Fungi weathering Interfacial process Mineral dissolution Superoxides Synchrotron radiation
ISSN号	0016-7037
英文摘要	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 similar to 3000 mu m(-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 (similar to 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. (C) 2019 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43300]
专题	生态环境研究中心_土壤环境科学实验室
作者单位	1.Tianjin Univ, Tianjin Key Lab Earth Crit Zone Sci & Sustainable, Tianjin 300072, Peoples R China 2.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China 3.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China
推荐引用方式 GB/T 7714	Yu, Guang-Hui,Chi, Zhi-Lai,Teng, H. Henry,et al. Fungus-initiated catalytic reactions at hyphal-mineral interfaces drive iron redox cycling and biomineralization[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2019,260:192-203.
APA	Yu, Guang-Hui.,Chi, Zhi-Lai.,Teng, H. Henry.,Dong, Hai-Liang.,Kappler, Andreas.,...&Zhu, Yong-Guan.(2019).Fungus-initiated catalytic reactions at hyphal-mineral interfaces drive iron redox cycling and biomineralization.GEOCHIMICA ET COSMOCHIMICA ACTA,260,192-203.
MLA	Yu, Guang-Hui,et al."Fungus-initiated catalytic reactions at hyphal-mineral interfaces drive iron redox cycling and biomineralization".GEOCHIMICA ET COSMOCHIMICA ACTA 260(2019):192-203.