Symbiotic effectiveness and ecological characterization of indigenous Rhizobium loti populations in Uruguay
Autor(a) principal: | |
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Data de Publicação: | 1999 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Pesquisa Agropecuária Brasileira (Online) |
Texto Completo: | https://seer.sct.embrapa.br/index.php/pab/article/view/5281 |
Resumo: | The objectives of this work were to describe the distribution, density and seasonal variation of the indigenous populations of Rhizobium loti in different Uruguayan soils and to determine the symbiotic effectiveness and stress tolerance factors of different isolates, both with the aim of obtaining selected strains to re-introduce as inoculants in Lotus pastures. R. loti was present in ten soils studied and their densities varied from year to year and within each soil. All the isolates nodulated Lotus corniculatus effectively. The nodules in Lotus pedunculatus and Lotus subbiflorus were small, red on the surface and ineffective in nitrogen fixation. The study of 50 isolates from the ten soils showed high variability in their symbiotic efficiency and tolerance to pH. The indigenous population was acid tolerant in culture medium (pH 4.5), 83% of them could grow at pH 4.5 in 3 days. This work showed that there was a great diversity between the strains of R. loti isolated from Uruguayan soils and supports the importance of selecting among them the most efficient and resistant strains to be included in the inoculants. |
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Symbiotic effectiveness and ecological characterization of indigenous Rhizobium loti populations in UruguayEficiência simbiótica e caracterização ecológica de uma população nativa de Rhizobium loti no UruguaiLotus corniculatus; Lotus pedunculatus; rhizobial pH toleranceLotus corniculatus; Lotus pedunculatus; tolerância do rizóbio ao pHThe objectives of this work were to describe the distribution, density and seasonal variation of the indigenous populations of Rhizobium loti in different Uruguayan soils and to determine the symbiotic effectiveness and stress tolerance factors of different isolates, both with the aim of obtaining selected strains to re-introduce as inoculants in Lotus pastures. R. loti was present in ten soils studied and their densities varied from year to year and within each soil. All the isolates nodulated Lotus corniculatus effectively. The nodules in Lotus pedunculatus and Lotus subbiflorus were small, red on the surface and ineffective in nitrogen fixation. The study of 50 isolates from the ten soils showed high variability in their symbiotic efficiency and tolerance to pH. The indigenous population was acid tolerant in culture medium (pH 4.5), 83% of them could grow at pH 4.5 in 3 days. This work showed that there was a great diversity between the strains of R. loti isolated from Uruguayan soils and supports the importance of selecting among them the most efficient and resistant strains to be included in the inoculants.Os objetivos deste trabalho foram descrever a distribuição, densidade e variação sazonal de populações nativas de Rhizobium loti em diferentes solos uruguaios, e determinar a eficiência simbiótica e os fatores de tolerância a estresse de diversos isolados, tendo em vista a obtenção de cepas a serem reintroduzidas como inoculantes em pastagens de Lotus. Rhizobium loti estava presente em dez solos estudados, e suas densidades variavam de ano para ano e em cada solo. Todos os isolados nodularam efetivamente o Lotus corniculatus. Os nódulos no Lotus pedunculatus e no Lotus subbiflorus eram pequenos, vermelhos na superfície, e ineficazes na fixação de N. O estudo de 50 isolados dos dez solos mostraram alta variabilidade na sua eficiência simbiótica, e alta tolerância ao pH. A população nativa era tolerante à acidez em meio de cultura (pH 4,5); 83% dela pode crescer em pH 4,5 em três dias. O presente trabalho mostrou que há grande diversidade entre as cepas de R. loti isoladas de solos uruguaios, e acentua a importância de se selecionar entre elas as mais eficientes e resistentes, para serem incluídas como inoculantes.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraBaraibar, AmaliaFrioni, LillianGuedes, Maria ElenaLjunggren, Hans1999-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/5281Pesquisa Agropecuaria Brasileira; v.34, n.6, jun. 1999; 1011-1017Pesquisa Agropecuária Brasileira; v.34, n.6, jun. 1999; 1011-10171678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/5281/2473info:eu-repo/semantics/openAccess2010-07-09T14:33:53Zoai:ojs.seer.sct.embrapa.br:article/5281Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2010-07-09T14:33:53Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Symbiotic effectiveness and ecological characterization of indigenous Rhizobium loti populations in Uruguay Eficiência simbiótica e caracterização ecológica de uma população nativa de Rhizobium loti no Uruguai |
title |
Symbiotic effectiveness and ecological characterization of indigenous Rhizobium loti populations in Uruguay |
spellingShingle |
Symbiotic effectiveness and ecological characterization of indigenous Rhizobium loti populations in Uruguay Baraibar, Amalia Lotus corniculatus; Lotus pedunculatus; rhizobial pH tolerance Lotus corniculatus; Lotus pedunculatus; tolerância do rizóbio ao pH |
title_short |
Symbiotic effectiveness and ecological characterization of indigenous Rhizobium loti populations in Uruguay |
title_full |
Symbiotic effectiveness and ecological characterization of indigenous Rhizobium loti populations in Uruguay |
title_fullStr |
Symbiotic effectiveness and ecological characterization of indigenous Rhizobium loti populations in Uruguay |
title_full_unstemmed |
Symbiotic effectiveness and ecological characterization of indigenous Rhizobium loti populations in Uruguay |
title_sort |
Symbiotic effectiveness and ecological characterization of indigenous Rhizobium loti populations in Uruguay |
author |
Baraibar, Amalia |
author_facet |
Baraibar, Amalia Frioni, Lillian Guedes, Maria Elena Ljunggren, Hans |
author_role |
author |
author2 |
Frioni, Lillian Guedes, Maria Elena Ljunggren, Hans |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Baraibar, Amalia Frioni, Lillian Guedes, Maria Elena Ljunggren, Hans |
dc.subject.por.fl_str_mv |
Lotus corniculatus; Lotus pedunculatus; rhizobial pH tolerance Lotus corniculatus; Lotus pedunculatus; tolerância do rizóbio ao pH |
topic |
Lotus corniculatus; Lotus pedunculatus; rhizobial pH tolerance Lotus corniculatus; Lotus pedunculatus; tolerância do rizóbio ao pH |
description |
The objectives of this work were to describe the distribution, density and seasonal variation of the indigenous populations of Rhizobium loti in different Uruguayan soils and to determine the symbiotic effectiveness and stress tolerance factors of different isolates, both with the aim of obtaining selected strains to re-introduce as inoculants in Lotus pastures. R. loti was present in ten soils studied and their densities varied from year to year and within each soil. All the isolates nodulated Lotus corniculatus effectively. The nodules in Lotus pedunculatus and Lotus subbiflorus were small, red on the surface and ineffective in nitrogen fixation. The study of 50 isolates from the ten soils showed high variability in their symbiotic efficiency and tolerance to pH. The indigenous population was acid tolerant in culture medium (pH 4.5), 83% of them could grow at pH 4.5 in 3 days. This work showed that there was a great diversity between the strains of R. loti isolated from Uruguayan soils and supports the importance of selecting among them the most efficient and resistant strains to be included in the inoculants. |
publishDate |
1999 |
dc.date.none.fl_str_mv |
1999-06-01 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/5281 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/5281 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/5281/2473 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
dc.source.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira; v.34, n.6, jun. 1999; 1011-1017 Pesquisa Agropecuária Brasileira; v.34, n.6, jun. 1999; 1011-1017 1678-3921 0100-104x reponame:Pesquisa Agropecuária Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Agropecuária Brasileira (Online) |
collection |
Pesquisa Agropecuária Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pab@sct.embrapa.br || sct.pab@embrapa.br |
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1793416698796179456 |