Data/hora: 01/06/2024 11:39:02

Biblioteca(s): | Embrapa Semiárido.
Data corrente: | 20/08/2021
Data da última atualização: | 20/08/2021
Autoria: | DIAS, M. A. M.; BOMFIM, C. S. G.; RODRIGUES, D. R.; SILVA, A. F. da; SANTOS, J. C. S.; NASCIMENTO, T. R. do; MARTINS, L. M. V.; DANTAS, B. F.; RIBEIRO, P. R. de A.; FREITAS, A. D. S. de; FERNANDES JUNIOR, P. I.
Afiliação: | MARCOS ANDRÉ MOURA DIAS, UNIVASF; CLAUDIA SILVA GOMES BOMFIM; DALILA RIBEIRO RODRIGUES, UEPB; ALEKSANDRO FERREIRA DA SILVA, UFRPE; JÉSSICA CAROLINE SOUZA SANTOS, UPE; TAILANE RIBEIRO DO NASCIMENTO, UNEB; LINDETE MÍRIA VIEIRA MARTINS, UNEB; BARBARA FRANCA DANTAS, CPATSA; PAULA ROSE DE ALMEIDA RIBEIRO; ANA DOLORES SANTIAGO DE FREITAS, UFRPE; PAULO IVAN FERNANDES JUNIOR, CPATSA.
Título: | Paraburkholderia spp. are the main rhizobial microsymbionts of Mimosa tenuiflora (Willd.) Poir. in soils of the Brazilian tropical dry forests (Caatinga biome).
Ano de publicação: | 2021
Fonte/Imprenta: | Systematic and Applied Microbiology, v. 44, 2021.
DOI: | https://doi.org/10.1016/j.syapm.2021.126208
Idioma: | Inglês
Conteúdo: | Mimosa tenuiflora (Willd.) Poir. is widespread in southern and central American drylands, but little information is available concerning its associated rhizobia. Therefore, this study aimed to characterize M. tenuiflora rhizobia from soils of the tropical dry forests (Caatinga) in Pernambuco State, Brazil, at the molecular and symbiotic levels. Soil samples of pristine Caatinga areas in four municipalities were used to grow M. tenuiflora. First, the bacteria from root nodules were subjected to nodC/nifH gene amplification, and the bacteria positive for both genes had the 16S rRNA gene sequenced. Then, ten strains were evaluated using recA, gyrB, and nodC gene sequences, and seven of them had their symbiotic efficiency assessed. Thirty-two strains were obtained and 22 of them were nodC/nifH positive. Twenty strains clustered within Paraburkholderia and two within Rhizobium by 16S rRNA gene sequencing. The beta-rhizobia were similar to P. phenoliruptrix (12) and P. diazotrophica (8). Both alpha-rhizobia were closely related to R. miluonense. The recA + gyrB phylogenetic analysis clustered four and five strains within the P. phenoliruptrix and P. diazotrophica branches, respectively, but they were somewhat divergent to the 16S rRNA phylogeny. For Rhizobium sp. ESA 637, the recA + gyrB phylogeny clustered the strain with R. jaguaris. The nodC phylogeny indicated that ESA 626, ESA 629, and ESA 630 probably represented a new symbiovar branch. The inoculation assay showed high symbiotic efficiency for all tested strains. The results indicated high genetic diversity and efficiency of M. tenuiflora rhizobia in Brazilian drylands and included P. phenoliruptrix-like bacteria in the list of efficient beta-rhizobia in the Caatinga biome.
Palavras-Chave: | Bioma Caatinga; Fixação biológica de nitrogênio; Região semiárida brasileira; Rizobio.
Thesagro: | Caatinga; Floresta Tropical; Inoculante; Solo.
Thesaurus Nal: | Soil.
Categoria do assunto: | G Melhoramento Genético
Registro original: | Embrapa Semiárido (CPATSA)
Exemplares: | CPATSA - (59616-1) - UPC - AP - DD -  -  -  - DIS