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| ORMEÑO-ORRILLO, E.; GOMES, D. F.; CERRO, P. del; VASCONCELOS, A. T. R.; CANCHAYA, C.; ALMEIDA, L. G. P.; MERCANTE, F. M.; JAVIER OLLERO, F.; MEGÍAS, M.; HUNGRIA, M.. |
| Common bean (Phaseolus vulgaris L.) is the most important legume cropped worldwide for food production and its agronomic performance can be greatly improved if the benefits from symbiotic nitrogen fixation are maximized. The legume is known for its high promiscuity in nodulating with several Rhizobium species, but those belonging to the Rhizobium tropici ?group? are the most successful and efficient in fixing nitrogen in tropical acid soils. Rhizobium leucaenae belongs to this group, which is abundant in the Brazilian ?Cerrados? soils and frequently submitted to several environmental stresses. Here we present the first high-quality genome drafts of R. leucaenae, including the type strain CFN 299T and the very efficient strain CPAO 29.8. Our main objective... |
| Tipo: Separatas |
Palavras-chave: Fixação biológica de nitrogênio. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1056833 |
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| CERRO, P. del; ROLLA-SANTOS, A. A. P.; VALDERRAMA-FERNANDEZ, R.; GIL-SERRANO, A.; BELLOGÍN, R. A.; GOMES, D. F.; MONTAÑO, F. P.; MEGÍAS, M.; HUNGRIA, M.; JAVIER OLLERO, F.. |
| The establishment of nitrogen-fixing rhizobium-legume symbioses requires a highly complex cascade of events. In this molecular dialogue the bacterial NodD transcriptional regulators in conjunction with plant inducers, mostly flavonoids, are responsible for the biosynthesis and secretion of Nod factors which are key molecules for successful nodulation. Other transcriptional regulators related to the symbiotic process have been identified in rhizobial genomes, including negative regulators such as NolR. Rhizobium tropici CIAT 899 is an important symbiont of common bean (Phaseolus vulgaris L.), and its genome encompasses intriguing features such as five copies of nodD genes, as well as other possible transcriptional regulators including the NolR protein. Here... |
| Tipo: Separatas |
Palavras-chave: Fixação de nitrogenio; Nitrogen fixation. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1043848 |
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| CERRO, P. del; ROLLA-SANTOS, A. A. P.; GOMES, D. F.; MARKS, B. B.; ESPUNY, M. del R.; RODRÍGUEZ-CARVAJAL, M. A.; SORIA-DÍAZ, M. E.; NAKATANI, A. S.; HUNGRIA, M.; JAVIER OLLERO, F.; MEGÍAS, M.. |
| Transcription of nodulation genes in rhizobial species is orchestrated by the regulatory nodD gene. Rhizobium tropici strain CIAT 899 is an intriguing species in possessing features such as broad host range, high tolerance of abiotic stresses and, especially, by carrying the highest known number of nodD genes?five?and the greatest diversity of Nod factors (lipochitooligosaccharides, LCOs). Here we shed light on the roles of the multiple nodD genes of CIAT 899 by reporting, for the first time, results obtained with nodD3, nodD4 and nodD5 mutants. The three nodD mutants were built by insertion of ? interposon. Nod factors were purified and identified by LC-MS/MS analyses. In addition, nodD1 and nodC relative gene expressions were measured by quantitative... |
| Tipo: Separatas |
Palavras-chave: Rhizobium; Fixação de nitrogênio; Bacteriologia do solo; Nodulação; Bacteriology; Nitrogen fixation; Nodulation.. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1039242 |
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| FAGOTTI, D. dos S. L.; ABRANTES, J. L. F.; CEREZINI, P.; FUKAMI, J.; NOGUEIRA, M. A.; CERRO, P. del; VALDERRAMA-FERNANDEZ, R.; OLLERO, F. J.; MEGIAS, M.; HUNGRIA, M.. |
| Tipo: Artigo de periódico |
Palavras-chave: Soja; Simbiose; Biofilme; Soybeans; Azospirillum brasilense; Bradyrhizobium; Biofilm. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1108528 |
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| CERRO, P. del; ROLLA-SANTOS, A. A. P.; GOMES, D. F.; MARKS, B. B.; PÉREZ-MONTAÑO, F.; RODRÍGUEZ-CARVAJAL, M. A.; NAKATANI, A. S.; GIL-SERRANO, A.; MEGÍAS, M.; OLLERO, F. J.; HUNGRIA, M.. |
| Nodulation and symbiotic nitrogen fixation are mediated by several genes, both of the host legume and of the bacterium. The rhizobial regulatory nodD gene plays a critical role, orchestrating the transcription of the other nodulation genes. Rhizobium tropici strain CIAT 899 is an effective symbiont of several legumes?with an emphasis on common bean (Phaseolus vulgaris)?and is unusual in carrying multiple copies of nodD, the roles of which remain to be elucidated. Results: Phenotypes, Nod factors and gene expression of nodD1 and nodD2 mutants of CIAT 899 were compared with those of the wild type strain, both in the presence and in the absence of the nod-gene-inducing molecules apigenin and salt (NaCl). Differences between the wild type and mutants were... |
| Tipo: Separatas |
Palavras-chave: Fixação de nitrogênio; Nitrogen fixation. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1013361 |
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| PÉREZ-MONTAÑO, F.; CERRO, P. del; JIMÉNEZ-GUERRERO, I.; LÓPEZ-BAENA, F. J.; CUBO, M. T.; HUNGRIA, M.; MEGÍAS, M.; OLLERO, F. J.. |
| Rhizobium tropici strain CIAT 899 establishes effective symbioses with several legume species, including Phaseolus vulgaris and Leucaena leucocephala. This bacterium synthesizes a large variety of nodulation factors in response to nod-gene inducing flavonoids and, surprisingly, also under salt stress conditions. The aim of this study was to identify differentially expressed genes in the presence of both inducer molecules, and analyze the promoter regions located upstream of these genes. Results obtained by RNA-seq analyses of CIAT 899 induced with apigenin, a nod gene-inducing flavonoid for this strain, or salt allowed the identification of 19 and 790 differentially expressed genes, respectively. Fifteen of these genes were up-regulated in both conditions... |
| Tipo: Separatas |
Palavras-chave: RNA-seq; Nod factors; Lipochitooligosaccharides; Nodutlation.; Nodulação; Rhizobium; Rhizobium tropici; Apigenin; Salt stress.. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1041600 |
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