Data/hora: 11/06/2024 00:58:51

Provedor de dados: 	65	
País: 	Brazil	
Título: 	Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils	
Autores: 	Fracetto,Felipe José Cury; Fracetto,Giselle Gomes Monteiro; Barros,Felipe Martins do Rêgo; Lira Junior,Mario de Andrade; Siqueira Neto,Marcos.	
Data: 	2019-01-01	
Ano: 	2019	
Palavras-chave: 	NifH; Microorganism diversity; Ricinoculture; Caatinga dry forest.	
Resumo: 	ABSTRACT:  There are few studies of microbial diversity in castor bean soils in tropical semiarid environmental. Castor bean products have been widely used around the world justifying the commercial importance of ricinoculture in Brazil’ northeastern semiarid. There is no fertilization or maintenance of litter on the soils from the present study, so we hypothesized that the free-living diazotrophs microorganisms drive the nitrogen (N) input into these soils. We evaluated the communities’ structure and diversity of diazotrophs in tropical semiarid soils with i-Castor bean 50 years of cultivation intercropping with maize (CB-50); ii-Only Castor bean 10 years of cultivation (CB-10) and iii-soil under Caatinga vegetation (CAA). Nitrogenase enzyme activity was performed by the acetylene reduction assay (ARA) and the community profile of nifH gene was separated by denaturing gradient gel polyacrylamide electrophoresis (DGGE). Diazotrophs diversity was estimated by the Shannon (H’) and Simpson (D) indexes. Based on the maintenance of soil N stocks and N-microbial biomass over time, the activity of free-living diazotrophs was determinant in the N-input into these soils. The nifH gene was present and its profiles grouped the CB-50 with CAA treatments, so it reinforced the N-fixing by diazotrophs, which presented a greater diversity in the cultivated soils, even after the land use change for the castor bean implementation.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200252	
Editor: 	Universidade Federal de Santa Maria	
Relação: 	10.1590/0103-8478cr20190446	
Formato: 	text/html	
Fonte: 	Ciência Rural  v.49 n.12 2019	
Fonte: 	info:eu-repo/semantics/openAccess