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Biblioteca(s):  Embrapa Soja.
Data corrente:  06/03/2006
Data da última atualização:  26/07/2024
Tipo da produção científica:  Artigo em Periódico Indexado
Autoria:  KASCHUK, G.; HUNGRIA, M.; SANTOS, J. C. P.; BERTON JUNIOR, J. F.
Afiliação:  MARIANGELA HUNGRIA DA CUNHA, CNPSO.
Título:  Differences in common bean rhizobial populations associated with soil tillage management in southern Brazil.
Ano de publicação:  2006
Fonte/Imprenta:  Soil & Tillage Research, v. 87, n. 2, p. 205-217, Jun. 2006.
DOI:  10.1016/j.still.2005.03.008
Idioma:  Inglês
Conteúdo:  Progressive adoption of no-tillage (NT) agriculture in the tropics is finally reversing physical, chemical, and biological erosion of soil and in Brazil, an estimated 19 Mha are now devoted to NT. Common bean (Phaseolus vulgaris L.) is a main component of Brazilian agriculture, and enhancement of yields has been achieved under NT as a result of mitigation of environmental stresses, resulting in higher N2 fixation. However, the effects of NT on rhizobial diversity are poorly understood. This study evaluated rhizobial diversity in soils planted to common bean under NT or conventional tillage (CT) systems that were compared with natural grassland used for grazing, in the State of Santa Catarina, southern Brazil. Genetic diversity was assessed by the amplification of the DNA by PCR with specific primers (BOX-PCR) and by RFLP-PCR analyses of the 16S rDNA region. A high level of diversity was observed among strains from all three systems, such that the similarity in the clustering analysis of BOX-PCR products ranged from 36% under natural grassland to only 23% for CT strains. High polymorphism was confirmed in the RFLP-PCR analysis; forty-seven different profiles were obtained, none sharing high similarity with the profiles of reference species of common bean rhizobia. These results indicate that other tropical rhizobial species remain to be described. Genetic diversity was higher among the NT than the CT rhizobial strains, especially when the RFLP-PCR profiles were considered. Ge... Mostrar Tudo
Palavras-Chave:  Rizóbio.
Thesagro:  Feijão; Fixação de Nitrogênio; Solo.
Thesaurus Nal:  Beans; Nitrogen fixation.
Categoria do assunto:  X Pesquisa, Tecnologia e Engenharia
Marc:  Mostrar Marc Completo
Registro original:  Embrapa Soja (CNPSO)
Biblioteca ID Origem Tipo/Formato Classificação Cutter Registro Volume Status URL
CNPSO26071 - 1UPCAP - DD
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