Bacterial diversity in soil in response to different plans, phosphate fertilizers and liming

Silva, Paulo da; Nahas, Ely

doi:10.1590/s1517-83822002000400005

Cited by 36 publications

(22 citation statements)

References 32 publications

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“…In other studies to assess soil diversity in tropical regions Bacillus, Micrococcus and Enterobacter genera were found, being the latest the most abundant genera, but Lactobacillus genus was detected as well (23).…”

Section: Resultsmentioning

confidence: 91%

Bacterial diversity in rice-field water in Rio Grande do Sul

Reche

Fiúza

2005

Braz. J. Microbiol.

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Bacteria are the most diverse living beings on earth and only a fraction of them have been identified. This paper aims at the analysis of the diversity of mesophilic and heterotrophic bacteria found in samples of irrigation water from rice-fields areas in Rio Grande do Sul State, Brazil. Sample collection was carried out in five rice crop regions areas and followed by isolation, multiplication and bacterial characterization. The species' identification was based on biochemical tests (API-System, bioMérieux). Bacterial diversity was determined by the Shannon & Weaner and Pielou index. The results regarding bacterial diversity revealed 26 species. The most abundant representatives belonged to the Bacillus, Corynebacterium, Staphylococcus and Lactobacillus genera, homogeneously distributed in all studied rice crop areas, and in those areas corresponding to the irrigation channel and the rice growing plot as well. The water of the irrigation channel showed the greatest diversity (H'= 1.00) when compared to the plot (H'= 0.77). The channel also presented a more even species distribution (e = 0.73), while the plot (e = 0.59) had the greatest prevalence represented by the Bacillus genus. The areas and the cultivation phases did not significantly affect the bacterial diversity in the study areas (F4,12=1.04; P>0.05). The results showed that culture management could affect water bacterial populations.

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Section: Resultsmentioning

confidence: 91%

Bacterial diversity in rice-field water in Rio Grande do Sul

Reche

Fiúza

2005

Braz. J. Microbiol.

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“…Soil microorganisms and their metabolisms are sensitive indicators of soil fertility and environmental changes (Wang et al 2007). Bacterial, fungal, and actinomycetes populations of soils are functions of the soils' organic carbon contents (Entry et al 2008); a pH at the upper end of the normal range often has been observed to encourage microbial growth (Silva and Nahas 2002). However, heavy metals might alter the population size, diversity, and activities of microbes in the receiving soils (Rajapaksha et al 2004).…”

Section: Discussionmentioning

confidence: 99%

Influence of Biochar on Microbial Activities of Heavy Metals Contaminated Paddy Fields

Cui¹,

Yan²,

Yang³

et al. 2013

BioResources

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dBiochar (BC) amendments might decrease the bioavailability of metals in soils that are contaminated with heavy metals. In general, soil microbial communities are sensitive to changes in soil property changes. Microbial communities were tested in a Cd-and Pb-polluted paddy field in southern China. BC was applied as a basal soil amendment before rice transplantation in 2009. The BC was applied at rates of 0, 10, 20, and 40 tons per hectare. Soil heavy metal fractions with sequential extraction procedure, soil microorganisms, and enzymes were monitored in 2011. The soil pH and soil organic carbon (SOC) were significantly increased by 2% to 5% and 16% to 51% under BC amendment, respectively. Compared to the non-BC treatment, the cadmium (Cd) and lead (Pb) acid-soluble fraction concentrations were significantly decreased by 15.3% to 26.7% and 18.2% to 30.9%. The Cd and Pb reducible fraction were decreased by 13.5% to 25.6% and 21.9% to 23.53%.The Cd and Pb oxidizable fraction by 15.4% to 69.2% and 22.7% to 29.3% with BC application, respectively. The populations of actinomycetes and fungi were increased by 19.0% to 38.5% and 3.7 to 9.3 times, respectively. Meanwhile, BC significantly increased the cellulose, urine enzyme, neutral phosphatase, and sucrase activities by 117.4% to 178.3%, 31.1% to 37.6%, 29.7% to 193.8%, and 36.5% to 328.6%, respectively. BC amendment offers a basic option to reduce Cd and Pb bioavailability and change the fractions. The BC also increases microorganism quantity and soil enzyme activity.

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“…Each isolate was examined by Gram staining and endospore staining [13]. Most of the biochemical tests were performed according to MacFaddin [14].…”

Section: Morphological and Biochemical Testmentioning

confidence: 99%

Morphological, enzymatic screening, and phylogenetic analysis of thermophilic bacilli isolated from five hot springs of Myagdi, Nepal

2018

J App Biol Biotech

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The present study was conducted to identify and characterize the thermophilic bacteria isolated from five hot springs, namely, Sinkosh, Singha, Bhurung, Ratopani, and Paudwar located in Myagdi district, Nepal, using phenotypic and genotypic methods. The hot spring has temperature 42-62°C and pH 6.5-6.8. Isolation of thermophiles was done using simple enriched nutrient broth media at 60°C. Selected strains were screened for thermostable enzymes; cellulase, hemicellulase, amylase, protease, gelatinase, and lipase using substrates carboxymethylcellulose, xylan, soluble starch, casein, gelatin, and Tween (20, 40, 60, or 80), respectively. The bacteria were grouped into 16 groups based on morphological and biochemical characteristics. 16S rRNA sequence analysis of 16 isolates and phylogenetic analysis showed a cluster of five distinct taxonomic groups. The groups were identified as genus Anoxybacillus, Aeribacillus, Brevibacillus, Bacillus, and Geobacillus, based on ≥95% similarity with reference strains. This is the first study that reports Anoxybacillus sp., Brevibacillus sp., and Aeribacillus sp. from the hot springs of Nepal.

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Bacterial diversity in soil in response to different plans, phosphate fertilizers and liming

Cited by 36 publications

References 32 publications

Bacterial diversity in rice-field water in Rio Grande do Sul

Bacterial diversity in rice-field water in Rio Grande do Sul

Influence of Biochar on Microbial Activities of Heavy Metals Contaminated Paddy Fields

Morphological, enzymatic screening, and phylogenetic analysis of thermophilic bacilli isolated from five hot springs of Myagdi, Nepal

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