The moderately halophilic bacterium<i>Halomonas maura</i>is a free-living diazotroph

Argandoña, Montserrat; Fernandez-Carazo, Rafael; Llamas, Inmaculada; Martínez‐Checa, Fernando; Caba, Juan Manuel; Quesada, Emilia; Moral, Ana

doi:10.1016/j.femsle.2005.01.019

Cited by 25 publications

(15 citation statements)

References 24 publications

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“…In the supratidal rhizosphere, Marinobacter and Alcanivorax were replaced by salt-loving bacteria of the genus Halomonas , which have been previously observed in association with Salicornia spp. (Argandoña et al, 2005; Jha et al, 2012; Mapelli et al, 2013a) and other halophytes (Borruso et al, 2014). Together with Bacillus , the genus Pseudomonas was one of the two genera isolated using both the media and overall its abundance was higher in the supratidal rhizospheres.…”

Section: Discussionmentioning

confidence: 99%

Salicornia strobilacea (Synonym of Halocnemum strobilaceum) Grown under Different Tidal Regimes Selects Rhizosphere Bacteria Capable of Promoting Plant Growth

et al. 2016

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Halophytes classified under the common name of salicornia colonize salty and coastal environments across tidal inundation gradients. To unravel the role of tide-related regimes on the structure and functionality of root associated bacteria, the rhizospheric soil of Salicornia strobilacea (synonym of Halocnemum strobilaceum) plants was studied in a tidal zone of the coastline of Southern Tunisia. Although total counts of cultivable bacteria did not change in the rhizosphere of plants grown along a tidal gradient, significant differences were observed in the diversity of both the cultivable and uncultivable bacterial communities. This observation indicates that the tidal regime is contributing to the bacterial species selection in the rhizosphere. Despite the observed diversity in the bacterial community structure, the plant growth promoting (PGP) potential of cultivable rhizospheric bacteria, assessed through in vitro and in vivo tests, was equally distributed along the tidal gradient. Root colonization tests with selected strains proved that halophyte rhizospheric bacteria (i) stably colonize S. strobilacea rhizoplane and the plant shoot suggesting that they move from the root to the shoot and (ii) are capable of improving plant growth. The versatility in the root colonization, the overall PGP traits and the in vivo plant growth promotion under saline condition suggest that such beneficial activities likely take place naturally under a range of tidal regimes.

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Section: Discussionmentioning

confidence: 99%

Salicornia strobilacea (Synonym of Halocnemum strobilaceum) Grown under Different Tidal Regimes Selects Rhizosphere Bacteria Capable of Promoting Plant Growth

et al. 2016

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“…Stimulation of the anodic reaction by acidic metabolites, such as organic acids, enhances corrosion. Recently, a strain from H. maura was reported to be able to fix nitrogen under microaerobic conditions (Argandona et al, 2005), however, the distribution of this capacity amongst Halomonas members is unknown. Halomonas polysaccharides have relevant physicochemical properties, such as a stable viscosity over a wide pH and salinity range (Martinez-Checa et al, 2001;Arias et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…In the context of a marine pipeline, the significant presence of Halomonas members could allow for the formation of a viscous biofilm, even in a saline environment. Recently, a strain from H. maura was reported to be able to fix nitrogen under microaerobic conditions (Argandona et al, 2005), however, the distribution of this capacity amongst Halomonas members is unknown. Because marine water is limited in assimilable nitrogen sources (Harayama et al, 1999), the presence of diazotrophic bacteria would be very important to promote local nitrogen flow.…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic analysis of a biofilm bacterial population in a water pipeline in the Gulf of Mexico

López

Serna

Jan‐Roblero

et al. 2006

FEMS Microbiology Ecology

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The aim of this study was to assess the bacterial diversity associated with a corrosive biofilm in a steel pipeline from the Gulf of Mexico used to inject marine water into the oil reservoir. Several aerobic and heterotrophic bacteria were isolated and identified by 16S rRNA gene sequence analysis. Metagenomic DNA was also extracted to perform a denaturing gradient gel electrophoresis analysis of ribosomal genes and to construct a 16S rRNA gene metagenomic library. Denaturing gradient gel electrophoresis profiles and ribosomal libraries exhibited a limited bacterial diversity. Most of the species detected in the ribosomal library or isolated from the pipeline were assigned to Proteobacteria (Halomonas spp., Idiomarina spp., Marinobacter aquaeolei, Thalassospira sp., Silicibacter sp. and Chromohalobacter sp.) and Bacilli (Bacillus spp. and Exiguobacterium spp.). This is the first report that associates some of these bacteria with a corrosive biofilm. It is relevant that no sulfate-reducing bacteria were isolated or detected by a PCR-based method. The diversity and relative abundance of bacteria from water pipeline biofilms may contribute to an understanding of the complexity and mechanisms of metal corrosion during marine water injection in oil secondary recovery.

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“…Different works in the last years highlighted the importance of plant growth promoting bacteria in facilitating salt tolerance in plants devoted to food production [3, 7, 15, 16], and few reports emphasized the role of PGP bacteria associated with Salicornia spp. [17–22]. The investigation of the rhizobacterial community associated to plants naturally adapted to cope with extreme saline conditions might lead to several knowledge outputs: (i) the understanding of the plant-microbe interaction under saline conditions, (ii) definition of the mechanisms underlying plant growth with promotion under the salinity stress, and (iii) identification of bacterial strains to design biological fertilizers exploitable for agriculture in arid and saline lands.…”

Section: Introductionmentioning

confidence: 99%

Potential for Plant Growth Promotion of Rhizobacteria Associated withSalicorniaGrowing in Tunisian Hypersaline Soils

Mapelli

Marasco

Rolli

et al. 2013

BioMed Research International

144

103

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Soil salinity and drought are among the environmental stresses that most severely affect plant growth and production around the world. In this study the rhizospheres of Salicornia plants and bulk soils were collected from Sebkhet and Chott hypersaline ecosystems in Tunisia. Depiction of bacterial microbiome composition by Denaturing Gradient Gel Electrophoresis unveiled the occurrence of a high bacterial diversity associated with Salicornia root system. A large collection of 475 halophilic and halotolerant bacteria was established from Salicornia rhizosphere and the surrounding bulk soil, and the bacteria were characterized for the resistance to temperature, osmotic and saline stresses, and plant growth promotion (PGP) features. Twenty Halomonas strains showed resistance to a wide set of abiotic stresses and were able to perform different PGP activities in vitro at 5% NaCl, including ammonia and indole-3-acetic acid production, phosphate solubilisation, and potential nitrogen fixation. By using a gfp-labelled strain it was possible to demonstrate that Halomonas is capable of successfully colonising Salicornia roots in the laboratory conditions. Our results indicated that the culturable halophilic/halotolerant bacteria inhabiting salty and arid ecosystems have a potential to contribute to promoting plant growth under the harsh salinity and drought conditions. These halophilic/halotolerant strains could be exploited in biofertilizer formulates to sustain crop production in degraded and arid lands.

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The moderately halophilic bacteriumHalomonas maurais a free-living diazotroph

Cited by 25 publications

References 24 publications

Salicornia strobilacea (Synonym of Halocnemum strobilaceum) Grown under Different Tidal Regimes Selects Rhizosphere Bacteria Capable of Promoting Plant Growth

Salicornia strobilacea (Synonym of Halocnemum strobilaceum) Grown under Different Tidal Regimes Selects Rhizosphere Bacteria Capable of Promoting Plant Growth

Phylogenetic analysis of a biofilm bacterial population in a water pipeline in the Gulf of Mexico

Potential for Plant Growth Promotion of Rhizobacteria Associated withSalicorniaGrowing in Tunisian Hypersaline Soils

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