Transfer of the Symbiotic Plasmid of Rhizobium etli CFN42 to Endophytic Bacteria Inside Nodules

Conjugative transfer is one of the mechanisms allowing diversification and evolution of bacteria. Rhizobium etli CFN42 is a bacterial strain whose habitat is the rhizosphere and is able to form nodules as a result of the nitrogen-fixing symbiotic relationship it may establish with the roots of Phase...

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Autores principales: Bañuelos-Vazquez, Luis Alfredo, Cazares, Daniel, Rodríguez, Susana, Cervantes-De la Luz, Laura, Sánchez-López, Rosana, Castellani, Lucas Gabriel, Torres Tejerizo, Gonzalo Arturo, Brom, Susana
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Biología
Plasmid
Conjugative transfer
Nodulation
Rhizobia
Symbiosis
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/107846
http://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC7403402&blobtype=pdf
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-107846
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
Plasmid
Conjugative transfer
Nodulation
Rhizobia
Symbiosis
spellingShingle Biología
Plasmid
Conjugative transfer
Nodulation
Rhizobia
Symbiosis
Bañuelos-Vazquez, Luis Alfredo
Cazares, Daniel
Rodríguez, Susana
Cervantes-De la Luz, Laura
Sánchez-López, Rosana
Castellani, Lucas Gabriel
Torres Tejerizo, Gonzalo Arturo
Brom, Susana
Transfer of the Symbiotic Plasmid of Rhizobium etli CFN42 to Endophytic Bacteria Inside Nodules
topic_facet Biología
Plasmid
Conjugative transfer
Nodulation
Rhizobia
Symbiosis
description Conjugative transfer is one of the mechanisms allowing diversification and evolution of bacteria. Rhizobium etli CFN42 is a bacterial strain whose habitat is the rhizosphere and is able to form nodules as a result of the nitrogen-fixing symbiotic relationship it may establish with the roots of Phaseolus vulgaris. R. etli CFN42 contains one chromosome and six large plasmids (pRet42a – pRet42f). Most of the genetic information involved in the establishment of the symbiosis is localized on plasmid pRet42d, named as the symbiotic plasmid (pSym). This plasmid is able to perform conjugation, using pSym encoded transfer genes controlled by the RctA/RctB system. Another plasmid of CFN42, pRet42a, has been shown to perform conjugative transfer not only in vitro, but also on the surface of roots and inside nodules, using other rhizobia as recipients. In addition to the rhizobia involved in the formation of nodules, these structures have been shown to contain endophytic bacteria from different genera and species. In this work, we have explored the conjugative transfer of the pSym (pRet42d) from R. etli CFN42 to endophytic bacteria as putative recipients, using as donor a CFN42 derivative labeled with GFP in the pRet42d and RFP in the chromosome. We were able to isolate some transconjugants, which inherit the GFP, but not the RFP marker. Some of them were identified, analyzed and evaluated for their ability to nodulate. We found transconjugants from genera such as Stenotrophomonas, Achromobacter, and Bacillus, among others. Although all the transconjugants carried the GFP marker, and nod, fix, and nif genes from pRet42d, not all were able to nodulate. Ultrastructure microscopy analysis showed some differences in the structure of the nodules of one of the transconjugants. A replicon of the size of pRet42d (371 Kb) could not be visualized in the transconjugants, suggesting that the pSym or a segment of the plasmid is integrated in the chromosome of the recipients. These findings strengthen the proposal that nodules constitute a propitious environment for exchange of genetic information among bacteria, in addition to their function as structures where nitrogen fixation and assimilation takes place.
format Articulo
Articulo
author Bañuelos-Vazquez, Luis Alfredo
Cazares, Daniel
Rodríguez, Susana
Cervantes-De la Luz, Laura
Sánchez-López, Rosana
Castellani, Lucas Gabriel
Torres Tejerizo, Gonzalo Arturo
Brom, Susana
author_facet Bañuelos-Vazquez, Luis Alfredo
Cazares, Daniel
Rodríguez, Susana
Cervantes-De la Luz, Laura
Sánchez-López, Rosana
Castellani, Lucas Gabriel
Torres Tejerizo, Gonzalo Arturo
Brom, Susana
author_sort Bañuelos-Vazquez, Luis Alfredo
title Transfer of the Symbiotic Plasmid of Rhizobium etli CFN42 to Endophytic Bacteria Inside Nodules
title_short Transfer of the Symbiotic Plasmid of Rhizobium etli CFN42 to Endophytic Bacteria Inside Nodules
title_full Transfer of the Symbiotic Plasmid of Rhizobium etli CFN42 to Endophytic Bacteria Inside Nodules
title_fullStr Transfer of the Symbiotic Plasmid of Rhizobium etli CFN42 to Endophytic Bacteria Inside Nodules
title_full_unstemmed Transfer of the Symbiotic Plasmid of Rhizobium etli CFN42 to Endophytic Bacteria Inside Nodules
title_sort transfer of the symbiotic plasmid of rhizobium etli cfn42 to endophytic bacteria inside nodules
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/107846
http://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC7403402&blobtype=pdf
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