Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Ciência Rural |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200252 |
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. |
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Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soilsnifHmicroorganism diversityricinocultureCaatinga dry forestABSTRACT: 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.Universidade Federal de Santa Maria2019-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200252Ciência Rural v.49 n.12 2019reponame:Ciência Ruralinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM10.1590/0103-8478cr20190446info:eu-repo/semantics/openAccessFracetto,Felipe José CuryFracetto,Giselle Gomes MonteiroBarros,Felipe Martins do RêgoLira Junior,Mario de AndradeSiqueira Neto,Marcoseng2019-11-28T00:00:00ZRevista |
dc.title.none.fl_str_mv |
Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils |
title |
Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils |
spellingShingle |
Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils Fracetto,Felipe José Cury nifH microorganism diversity ricinoculture Caatinga dry forest |
title_short |
Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils |
title_full |
Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils |
title_fullStr |
Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils |
title_full_unstemmed |
Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils |
title_sort |
Free-living diazotrophs drive castor bean nitrogen input in tropical semiarid soils |
author |
Fracetto,Felipe José Cury |
author_facet |
Fracetto,Felipe José Cury Fracetto,Giselle Gomes Monteiro Barros,Felipe Martins do Rêgo Lira Junior,Mario de Andrade Siqueira Neto,Marcos |
author_role |
author |
author2 |
Fracetto,Giselle Gomes Monteiro Barros,Felipe Martins do Rêgo Lira Junior,Mario de Andrade Siqueira Neto,Marcos |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Fracetto,Felipe José Cury Fracetto,Giselle Gomes Monteiro Barros,Felipe Martins do Rêgo Lira Junior,Mario de Andrade Siqueira Neto,Marcos |
dc.subject.por.fl_str_mv |
nifH microorganism diversity ricinoculture Caatinga dry forest |
topic |
nifH microorganism diversity ricinoculture Caatinga dry forest |
description |
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. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200252 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200252 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/0103-8478cr20190446 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
dc.source.none.fl_str_mv |
Ciência Rural v.49 n.12 2019 reponame:Ciência Rural instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Ciência Rural |
collection |
Ciência Rural |
repository.name.fl_str_mv |
|
repository.mail.fl_str_mv |
|
_version_ |
1749140554313105408 |