Nitrogen-Fixing Heterotrophic Bacteria in Coastal Waters: A Comparison of the Contribution Made by Sewage Effluent in a Temperate and a Tropical Environment

1988 ◽  
Vol 20 (11-12) ◽  
pp. 323-328 ◽  
Author(s):  
K. Jones ◽  
M. Betaieb

Using identical techniques a comparison has been made between the distribution and survival of heterotrophic nitrogen-fixing bacteria from sewage in cold seawater of Morecambe Pay, UK, and warm seawater of Oahu, Hawaii, USA. In the colder seawater the predominant nitrogen-fixing bacteria are salinity-tolerant strains of Enterobacteriaceae (mainly klebsiellas) which come from sewage effluent discharged into the rivers and estuaries flowing into the bay. In the inshore warmer waters of Oahu, similar numbers of heterotrophic nitrogen-fixing bacteria are found but, although most are salinity-tolerant, they are not predominantly Enterobacteriaceae. Sewage effluent from Honolulu discharged into the sea is rapidly dispersed and the bacteria quickly killed by UV light which penetrates into the clear water. In Morecambe Bay, bacteria are found much further out to sea and they survive for much longer periods because sunshine levels are relatively low and light penetration is inhibited by high turbidity from suspended solids. Salinity-tolerance does not appear to have a high survival value for the nitrogen-fixing klebsiellas.

2015 ◽  
Vol 17 (10) ◽  
pp. 3754-3765 ◽  
Author(s):  
Rosemary E. Scavotto ◽  
Claudia Dziallas ◽  
Mikkel Bentzon-Tilia ◽  
Lasse Riemann ◽  
Pia H. Moisander

2021 ◽  
Vol 4 (2) ◽  
pp. 27-30
Author(s):  
Ibrahim Alkali Allamin ◽  
Hussaini Shettima ◽  
Hafsat Muhammad Abdullahi ◽  
Usman Ali Bukar ◽  
Amina Umar Faruk ◽  
...  

This study was conducted to know the population of rhizobacteria in both irrigation and non-irrigation sites of the dam. The dense population of these organism indirectly promote plant growth and development. Five sites (A, B, C, D and E) were used to collect soil samples randomly and transported to the laboratory for analysis. Total heterotrophic bacterial count was done using nutrient agar (NA) and nitrogen fixing bacteria was counted using Ashbey’s media (AM). The result shows that highest number of total heterotrophic bacteria in site C (46.0×106) cfu/g in irrigation site whereas higher count in non-irrigation site was (13.0×106) site D, the nitrogen fixing bacterial count in irrigation site was higher at site E with (12.0×106) and for the non-irrigation site was higher at site D with (14.0×106) The total heterotrophic bacteria isolated in the soil sample are the species of Bacillus alvei, Bacillus alvei, Bacillus cereus, Bacillus cereus, Pseudomonas putida, Klebsiella aeruginosa and Enterobacter aeruginosa. Likewise, the Nitrogen fixing bacteria isolated are the species of Rhizobium leguminosarum, Klebsiella pneumonia, Bacillus lentus, Azotobacter nigricans, Azotobacter tropicalis, Azotobacter spp, and Azotobacter tropicalis. The long history of agricultural activities in the lake area has directly influenced the diversity of microbial population in the area.


2014 ◽  
Vol 71 (3) ◽  
pp. 171-180 ◽  
Author(s):  
Bruno Lima Soares ◽  
Paulo Avelar Ademar Ferreira ◽  
Silvia Maria de Oliveira-Longatti ◽  
Leandro Marciano Marra ◽  
Marcia Rufini ◽  
...  

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Luz K. Medina-Cordoba ◽  
Aroon T. Chande ◽  
Lavanya Rishishwar ◽  
Leonard W. Mayer ◽  
Lina C. Valderrama-Aguirre ◽  
...  

AbstractPrevious studies have shown the sugarcane microbiome harbors diverse plant growth promoting microorganisms, including nitrogen-fixing bacteria (diazotrophs), which can serve as biofertilizers. The genomes of 22 diazotrophs from Colombian sugarcane fields were sequenced to investigate potential biofertilizers. A genome-enabled computational phenotyping approach was developed to prioritize sugarcane associated diazotrophs according to their potential as biofertilizers. This method selects isolates that have potential for nitrogen fixation and other plant growth promoting (PGP) phenotypes while showing low risk for virulence and antibiotic resistance. Intact nitrogenase (nif) genes and operons were found in 18 of the isolates. Isolates also encode phosphate solubilization and siderophore production operons, and other PGP genes. The majority of sugarcane isolates showed uniformly low predicted virulence and antibiotic resistance compared to clinical isolates. Six strains with the highest overall genotype scores were experimentally evaluated for nitrogen fixation, phosphate solubilization, and the production of siderophores, gibberellic acid, and indole acetic acid. Results from the biochemical assays were consistent and validated computational phenotype predictions. A genotypic and phenotypic threshold was observed that separated strains by their potential for PGP versus predicted pathogenicity. Our results indicate that computational phenotyping is a promising tool for the assessment of bacteria detected in agricultural ecosystems.


PLoS ONE ◽  
2014 ◽  
Vol 9 (9) ◽  
pp. e106714 ◽  
Author(s):  
Huhe ◽  
Shinchilelt Borjigin ◽  
Yunxiang Cheng ◽  
Nobukiko Nomura ◽  
Toshiaki Nakajima ◽  
...  

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