Comparative study of wild and transformed salt tolerant bacterial strains on Triticum aestivum growth under salt stress

Afrasayab, Shazia; Faisal, Muhammad; Hasnain, Shahida

doi:10.1590/s1517-83822010000400013

Cited by 25 publications

(10 citation statements)

References 18 publications

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“…All microorganisms have the key ability to position themselves to explore the maximum benefits from their environments [10]. Several previous reports from our group highlight the significance of moderately halophilic strains in plant growth promotion [7,14]. We recently started to study the effect of varying salt concentrations on biofilm formation and EPS production ( Fig.…”

Section: Discussionmentioning

confidence: 99%

“…To investigate plant growth promotion by indigenous salt-tolerant bacteria in saline soil, it is necessary to investigate the extent of bacterial colonization on different surfaces and to understand the effect of salinity on bacterial colonization in the rhizosphere. During our earlier work, we tested the plant growth-promoting activities of these moderately salt-tolerant bacterial strains at different salinity levels [7]. The objective of our present study was to investigate the potential of EPS production and the biofilm-forming ability of several bacterial strains on biotic and abiotic surfaces under different salinity levels.…”

Section: Introduction *mentioning

confidence: 99%

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Biofilm formation in moderately halophilic bacteria is influenced by varying salinity levels

Qurashi

Sabri

2011

J. Basic Microbiol.

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Bacteria in a biofilm have a co-dependent lifestyle resulting in a harmonized and complex coordination of the bacterial cells within an exopolysaccharide (EPS) matrix. We hypothesized that biofilm formation and EPS production in salt-tolerant bacteria are helpful for plant growth improvement in saline soil, but that they are influenced differently. To investigate this hypothesis, we tested the effect of different salinity levels on the biofilm formation of the bacterial strains PAa6 (Halomonas meridiana), HT2 (Kushneria indalinina) and ST2 (Halomonas aquamarina) on different abiotic and biotic surfaces. Maximum biofilm formation was established at 1 M salt concentration. However, EPS production was maximal at 0-1 M NaCl stress. We also studied the effect of salt stress on EPS produced by the bacterial strains and confirmed the presence of EPS on Cicer arietinum var. CM 98 roots and in soil at different salinity levels, using Alcian blue staining. Overall, the strain PAa6 was more effective in biofilm formation and EPS production. Under saline and non-saline conditions, this strain also colonized the plant roots more efficiently as compared to the other two strains. We conclude that the strain PAa6 has the potential of biofilm formation and EPS production at different salinity levels. The presence of EPS in the biofilm helped the bacterial strains to better colonize the roots.

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Section: Discussionmentioning

confidence: 99%

Section: Introduction *mentioning

confidence: 99%

Biofilm formation in moderately halophilic bacteria is influenced by varying salinity levels

Qurashi

Sabri

2011

J. Basic Microbiol.

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“…Accumulation of extracellular exopolysaccharide and biofilm formation is commonly observed in bacteria. Significance of root-colonizing bacteria in improving plant growth has been variously reported (1).…”

Section: Introductionmentioning

confidence: 99%

Bacterial exopolysaccharide and biofilm formation stimulate chickpea growth and soil aggregation under salt stress

Qurashi

Sabri

2012

Braz. J. Microbiol.

258

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To compensate for stress imposed by salinity, biofilm formation and exopolysaccharide production are significant strategies of salt tolerant bacteria to assist metabolism. We hypothesized that two previously isolated salt-tolerant strains Halomonas variabilis (HT1) and Planococcus rifietoensis (RT4) have an ability to improve plant growth, These strains can form biofilm and accumulate exopolysacharides at increasing salt stress. These results showed that bacteria might be involved in developing microbial communities under salt stress and helpful in colonizing of bacterial strains to plant roots and soil particles. Eventually, it can add to the plant growth and soil structure. We investigated the comparative effect of exopolysacharide and biofilm formation in two bacterial strains Halomonas variabilis (HT1) and Planococcus rifietoensis (RT4) in response to varying salt stress. We found that biofilm formation and exopolysaccharide accumulation increased at higher salinity. To check the effect of bacterial inoculation on the plant (Cicer arietinum Var.CM-98) growth and soil aggregation, pot experiment was conducted by growing seedlings under salt stress.Inoculation of both strains increased plant growth at elevated salt stress. Weight of soil aggregates attached with roots and present in soil were added at higher salt concentrations compared to untreated controls. Soil aggregation was higher at plant roots under salinity. These results suggest the feasibility of using above strains in improving plant growth and soil fertility under salinity.

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“…For example, some bacterial strains can form a biofilm as a strategy to improve growth in crops such as wheat and chickpeas under severe environmental conditions (Afrasayab et al, 2010;Qurashi and Sabri, 2012). Moreover, Kasim et al (2016) concluded that Bacillus bacteria (such as Bacillus amyloliquifaciens) could provide a biofilm to alleviate salt stress around the root systems of crops such as barley.…”

Section: Microbiology and Possible Rolesmentioning

confidence: 99%

Halo-thermophilic bacteria and heterocyst cyanobacteria found adjacent to halophytes at Sabkhas, Qatar: Preliminary study and possible roles

Al‐Thani¹,

Yasseen²

2017

Afr. J. Microbiol. Res.

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This study was conducted to investigate the halo-thermophilic bacteria and cyanobacteria adjacent to the halophytic plants, Suaeda virmiculata, Limonium axillare and Tetraena qatarense, and the microbial functionalities in Sabkhas of Qatar. These soils are alkaline and highly saline, and their moisture contents varied throughout the year. A significant presence of thermo-halophilic bacteria was found when selective media was used; however, bacterial populations were highest in soil samples taken adjacent to L. axillare as compared to those taken adjacent to other halophytes. They were lowest in samples taken close to S. virmiculata. Microscopic examinations revealed that the bacterial cells of isolated strains were Gram-positive rods with pointed ends that occurred singly, in pairs or in short chains. Most were bacilli, either Bacillus thuringenses or Bacillus cereus. These can form endospores to survive until more favorable environmental conditions allow them to resume growth and activity. Moreover, when Sabkhan soils were transferred to the laboratory under natural conditions, only cyanobacteria grew, and some produced biofilms. The most recognizable cyanobacteria were Anabaena and Nostoc. Some produced heterocysts and akinetes, which play important roles in soil biology and nitrogen fixation. The possible roles of these microorganisms in saline environment in Sabkhan soil appear to be support of halophyte growth by alleviating salt stress and other extreme environmental conditions.

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Comparative study of wild and transformed salt tolerant bacterial strains on Triticum aestivum growth under salt stress

Cited by 25 publications

References 18 publications

Biofilm formation in moderately halophilic bacteria is influenced by varying salinity levels

Biofilm formation in moderately halophilic bacteria is influenced by varying salinity levels

Bacterial exopolysaccharide and biofilm formation stimulate chickpea growth and soil aggregation under salt stress

Halo-thermophilic bacteria and heterocyst cyanobacteria found adjacent to halophytes at Sabkhas, Qatar: Preliminary study and possible roles

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