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dc.contributor.author
Volfson, Victoria
dc.contributor.author
Fibach Paldi, Sharon
dc.contributor.author
Paulucci, Natalia Soledad
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dc.contributor.author
Dardanelli, Marta Susana
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dc.contributor.author
Matan, Ofra
dc.contributor.author
Burdman, Saul
dc.contributor.author
Okon, Yaacov
dc.date.available
2017-09-13T15:29:27Z
dc.date.issued
2013-09
dc.identifier.citation
Volfson, Victoria; Fibach Paldi, Sharon; Paulucci, Natalia Soledad; Dardanelli, Marta Susana; Matan, Ofra; et al.; Phenotypic variation in Azospirillum brasilense Sp7 does not influence plant growth promotion effects; Elsevier; Soil Biology And Biochemistry; 67; 9-2013; 255-262
dc.identifier.issn
0038-0717
dc.identifier.uri
http://hdl.handle.net/11336/24138
dc.description.abstract
The Azospirillum genus comprises free-living, plant growth-promoting, nitrogen-fixing bacteria found in the rhizosphere of plant roots. Azospirilla are able to promote plant growth mainly through improvement of root development. Bacterial surface components, such as extracellular polysaccharides and proteins, are involved in root colonization. Phase variation – or phenotypic variation – is one of the mechanisms by which microorganisms adapt to environmental changes. This phenomenon is characterized by the presence of a sub-population of the bacteria presenting a different phenotype relative to the major population. In this study we characterized phenotypic variation of Azospirillum brasilense Sp7. When plated on solid media, some A. brasilense colonies were shown to possess a much more mucoid morphology, producing 7.5–8 times more exopolysaccharide with different monosaccharide composition than the parental strain Sp7. The rate of appearance of this kind of variant colonies was 1 in 5000, in agreement with the accepted rate for the phase/phenotypic variation phenomenon. The variants were significantly more resistant to heat and UV-exposure than the parental strain and displayed genomic changes as seen by the different band patterns following ERIC-PCR, BOX-PCR and RAPD analyses. In plant inoculation experiments under greenhouse conditions, with maize, wheat, soybean and peanuts, the EPS overproducing variants performed as similar as the parental strain. Therefore, EPS overproduction did not confer an apparent advantage to A. brasilense in terms of induction of plant growth promotion.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Azospirillum Brasilense
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Phase Variation
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Plant Growth Promotion
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Genomic Changes
dc.subject.classification
Otras Agricultura, Silvicultura y Pesca
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dc.subject.classification
Agricultura, Silvicultura y Pesca
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dc.subject.classification
CIENCIAS AGRÍCOLAS
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dc.title
Phenotypic variation in Azospirillum brasilense Sp7 does not influence plant growth promotion effects
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-09-13T14:16:18Z
dc.journal.volume
67
dc.journal.pagination
255-262
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Volfson, Victoria. The Hebrew University Of Jerusalem; Israel
dc.description.fil
Fil: Fibach Paldi, Sharon. The Hebrew University Of Jerusalem; Israel
dc.description.fil
Fil: Paulucci, Natalia Soledad. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Biología Molecular; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Dardanelli, Marta Susana. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Biología Molecular; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Matan, Ofra. The Hebrew University Of Jerusalem; Israel
dc.description.fil
Fil: Burdman, Saul. The Hebrew University Of Jerusalem; Israel
dc.description.fil
Fil: Okon, Yaacov. The Hebrew University Of Jerusalem; Israel
dc.journal.title
Soil Biology And Biochemistry
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.soilbio.2013.09.008
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S003807171300309X
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