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Fungal communities in pressmud composting harbour beneficial and detrimental fungi for human welfare

de Oliveira, Tássio Brito and Barbosa, Fernando Nogueira and Ferro, Milene and Sette, Lara Durães and Meirelles, Lucas Andrade and Gomes, Eleni and Rodrigues, Andre and Lopes, Viviane Cristina Padilha (2016) Fungal communities in pressmud composting harbour beneficial and detrimental fungi for human welfare. Microbiology, 162 (7). pp. 1147-1156. ISSN 1350-0872. doi:10.1099/mic.0.000306.

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Pressmud is a substrate derived from sugarcane juice filtrate, and around 26-40  kg of this residue are produced per ton of sugarcane. It is mainly used as fertilizer in crops, and its application in the field is often made without any prior treatment, but, in this research, it was studied for the risk this practice poses for human health. This research was stimulated by previous results indicating the presence of opportunistic pathogens in residues used in various composting systems and the extensive use of fresh pressmud in agriculture. Here, It was assessed the fungal diversity present in both fresh and composting pressmud using 454 pyrosequencing. In addition, heat-tolerant fungi were isolated and surveyed for their enzymatic repertoire of biomass-degrading enzymes (cellulase, xylanase, laccase and polygalacturonase). A wide range of opportunistic pathogens was found among the most abundant taxa in the fresh pressmud, such as Lomentospora prolificans (43.13 %), Trichosporon sp. (10.07 %), Candida tropicalis (7.91 %), and Hormographiella aspergillata (8.19 %). This indicates that fresh pressmud might be a putative source of human pathogenic fungi, presenting a potential threat to human health if applied as fertilizer without any treatment. With regard to the heat-tolerant fungi found in this substrate, all the 110 isolates screened were able to produce at least one of the tested enzymes. The pressmud composting process not only effectively reduces the load of pathogenic fungi, but also creates an interesting environment for fungi able to produce thermostable hydrolytic and oxidative enzymes with biotechnological applications.

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Additional Information:© 2016 Microbiology Society. Received 4 March 2016. Accepted 6 May 2016. The authors would like to thank FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo) for providing financial support to AR (Young Research Award # 2011/16765–0) and for a scholarship to TBO (# 2012/14594–7). We are also grateful to all members of our research group for providing helpful comments on this manuscript. This work was performed under permit #010554/2014–9 issued by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico).
Funding AgencyGrant Number
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)2011/16765–0
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)2012/14594–7
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)010554/2014–9
Issue or Number:7
Record Number:CaltechAUTHORS:20161017-102454330
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Official Citation:Oliveira T, Lopes V, Barbosa F, Ferro M, Meirelles L, Sette L, Gomes E, Rodrigues A. Microbiology 162(7):1147-1156 doi:10.1099/mic.0.000306
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71152
Deposited By: Ruth Sustaita
Deposited On:17 Oct 2016 18:19
Last Modified:11 Nov 2021 04:40

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