Data/hora: 23/09/2024 11:10:23

Biblioteca(s): 	Embrapa Agrobiologia; Embrapa Florestas.	
Data corrente: 	15/06/2022	
Data da última atualização: 	20/06/2022	
Autoria: 	ETTO, R. M.; JESUS, E. da C.; CRUZ, L. M.; SCHNEIDER, B. S. F.; TOMACHEWSKI, D.; URREA-VALENCIA , S.; GONÇALVES, D. R. P.; GALVÃO, F.; AYUB, R. A.; CURCIO, G. R.; STEFFENS, M. B. R.; GALVÃO, C. W.	
Afiliação: 	R.M. ETTO, UEPG; EDERSON DA CONCEICAO JESUS, CNPAB; L.M. CRUZ, UNIVERSIDADE DO PARANÁ; B.S.F. SCHNEIDER, UEPG; D. TOMACHEWSKI, UEPG; S. URREA-VALENCIA, UEPG; D.R.P. GONÇALVES, UEPG; F. GALVÃO, UFP; R.A. AYUB, UEPG; GUSTAVO RIBAS CURCIO, CNPF; M. B. R. STEFFENS, UFP; C. W. GALVÃO, UEPG.	
Título: 	Influence of environmental factors on the tropical peatlands diazotrophic communities from the Southern Brazilian Atlantic Rain Forest.	
Ano de publicação: 	2022	
Fonte/Imprenta: 	Letters in Applied Microbiology, v. 74, n. 4, p. 543-554, 2022.	
DOI: 	https://doi.org/10.1111/lam.13638	
Idioma: 	Inglês	
Conteúdo: 	The tropical peatlands of southern Brazil are essential for the maintenance ofthe Atlantic Rain Forest, one of the 25 hotspots of biodiversity in the world.Although diazotrophic micro-organisms are essential for the maintenance ofthis nitrogen limited ecosystem, so far studies have focused only on micro-organisms involved in the carbon cycle. In this work, peat samples werecollected from three tropical peatland regions during dry and rainy seasonsand their chemical and microbial characteristics were evaluated. Our resultsshowed that the structure of the diazotrophic communities in the Braziliantropical peatlands differs in the evaluated seasons. The abundance of the genusBradyrhizobiumshowed to be affected by rainfall and peat pH. Despite theshifts of the nitrogen-fixing population in the tropical peatland caused byseasonality it showed to be constantly dominated bya-Proteobacteria followedbyCyanobacteria. In addition, more than 50% ofnifHgene sequences have notbeen classified, indicating the necessity for more studies in tropical peatland,since the reduction of N supply in the peatlands stimulates the recalcitrantorganic  matter  decomposition  performed  by  peatland  micro-organisms,influencing the C stock.

This manuscript reports the first ecological study of tropical peat-lands diazotrophic communities from the Brazilian Atlantic Rain Forest, one of the world?s largestbiodiversity hotspots. Based on culturing and culture-independent approaches, our results showed alter-ations in the structure of the diazotrophic communities in different seasons. The genusBradyrhizobiumabundance was affected by rainfall and peat pH. In addition, the great number of unclassifiednitrogen-fixing bacteria indicated the need for additional studies to guide future mitigation actions,since the reduction of N supply in the peatlands stimulates the recalcitrant organic matter decomposi-tion performed by peatland micro-organisms, influencing the C stock.	
Palavras-Chave: 	Biological nitrogen fixation; Community level; Mata Atlântica; Ombrotrophic peatland; Substrate utilization.	
Thesagro: 	Carbono; Fixação de Nitrogênio; Turfa.	
Thesaurus Nal: 	Microbial ecology.	
Categoria do assunto: 	S Ciências Biológicas	
Registro original: 	Embrapa Agrobiologia (CNPAB)	
Exemplares: 	CNPAB - (41935-1) - UPC - AP - DD -  -  -  - DIS
CNPF - (58300-1) - UPC - AP - DD -  -  -  - DIS