scholarly journals Agrochemicals and Bacterial Diversity in Cultivated Tropical Soils

10.5772/54963 ◽  
2013 ◽  
Author(s):  
Joseph Addo
Keyword(s):  
Bacterial Diversity ◽  
Tropical Soils

scholarly journals Bradyrhizobium as the Only Rhizobial Inhabitant of Mung Bean (Vigna radiata) Nodules in Tropical Soils: A Strategy Based on Microbiome for Improving Biological Nitrogen Fixation Using Bio-Products

2021 ◽  
Vol 11 ◽  
Author(s):  
Vinício Oliosi Favero ◽  
Rita Hilário Carvalho ◽  
Victória Monteiro Motta ◽  
Ana Beatriz Carneiro Leite ◽  
Marcia Reed Rodrigues Coelho ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Plant Growth ◽  
Grain Yield ◽  
Bacterial Diversity ◽  
Biological Nitrogen Fixation ◽  
Mung Bean ◽  
Soil Microbial Communities ◽  
Tropical Soils ◽  
Soil Samples ◽  
Biological Nitrogen

The mung bean has a great potential under tropical conditions given its high content of grain protein. Additionally, its ability to benefit from biological nitrogen fixation (BNF) through association with native rhizobia inhabiting nodule microbiome provides most of the nitrogen independence on fertilizers. Soil microbial communities which are influenced by biogeographical factors and soil properties, represent a source of rhizobacteria capable of stimulating plant growth. The objective of this study is to support selection of beneficial bacteria that form positive interactions with mung bean plants cultivated in tropical soils, as part of a seed inoculation program for increasing grain yield based on the BNF and other mechanisms. Two mung bean genotypes (Camaleão and Esmeralda) were cultivated in 10 soil samples. Nodule microbiome was characterized by next-generation sequencing using Illumina MiSeq 16S rRNA. More than 99% of nodule sequences showed similarity with Bradyrhizobium genus, the only rhizobial present in nodules in our study. Higher bacterial diversity of soil samples collected in agribusiness areas (MW_MT-I, II or III) was associated with Esmeralda genotype, while an organic agroecosystem soil sample (SE_RJ-V) showed the highest bacterial diversity independent of genotype. Furthermore, OTUs close to Bradyrhizobium elkanii have dominated in all soil samples, except in the sample from the organic agroecosystem, where just B. japonicum was present. Bacterial community of mung bean nodules is mainly influenced by soil pH, K, Ca, and P. Besides a difference on nodule colonization by OTU sequences close to the Pseudomonas genus regarding the two genotypes was detected too. Although representing a small rate, around 0.1% of the total, Pseudomonas OTUs were only retrieved from nodules of Esmeralda genotype, suggesting a different trait regarding specificity between macro- and micro-symbionts. The microbiome analysis will guide the next steps in the development of an inoculant for mung bean aiming to promote plant growth and grain yield, composed either by an efficient Bradyrhizobium strain on its own or co-inoculated with a Pseudomonas strain. Considering the results achieved, the assessment of microbial ecology parameters is a potent coadjuvant capable to accelerate the inoculant development process and to improve the benefits to the crop by soil microorganisms.

scholarly journals Changes in bacterial diversity associated with bioremediation of used lubricating oil in tropical soils

2017 ◽  
Vol 199 (6) ◽  
pp. 839-851 ◽  
Author(s):  
Naruemon Meeboon ◽  
Mary-Cathrine Leewis ◽  
Sireewan Kaewsuwan ◽  
Suppasil Maneerat ◽  
Mary Beth Leigh
Keyword(s):  
Bacterial Diversity ◽  
Tropical Soils ◽  
Lubricating Oil ◽  
Used Lubricating Oil

scholarly journals Effects of simulated warming on bacterial diversity and abundance in tropical soils from East Malaysia using open top chambers

2021 ◽  
Vol 67 (1) ◽  
pp. 64-74
Author(s):  
Chuen Yang Chua ◽  
Clemente Michael Vui Ling Wong
Keyword(s):  
Bacterial Diversity ◽  
Relative Abundance ◽  
Tropical Soils ◽  
Amplicon Sequencing ◽  
Tropical Region ◽  
Soil Bacterial Diversity ◽  
Atmospheric Concentration ◽  
Bacterial Phyla ◽  
16S Rdna Amplicon Sequencing ◽  
Set Up

The effects of global warming are increasingly evident, where global surface temperatures and atmospheric concentration of carbon dioxide have increased in past decades. Given the role of terrestrial bacteria in various ecological functions, it is important to understand how terrestrial bacteria would respond towards higher environmental temperatures. This study aims to determine soil bacterial diversity in the tropics and their response towards in situ warming using an open-top chamber (OTC). OTCs were set up in areas exposed to sunlight throughout the year in the tropical region in Malaysia. Soil samples were collected every 3 months to monitor changes in bacterial diversity using V3–V4 16S rDNA amplicon sequencing inside the OTCs (treatment plots) and outside the OTCs (control plots). After 12 months of simulated warming, an average increase of 0.81 to 1.15 °C was recorded in treatment plots. Significant changes in the relative abundance of bacterial phyla such as Bacteroidetes and Chloroflexi were reported. Increases in the relative abundance of Actinobacteria were also observed in treatment plots after 12 months. Substantial changes were observed at the genus level, where most bacterial genera decreased in relative abundance after 12 months. This study demonstrated that warming can alter soil bacteria in tropical soils from Kota Kinabalu.

Minimal and dynamic bacterial diversity in grease trap revealed by molecular analysis

2012 ◽  
Vol 43 (1) ◽  
pp. 29-41 ◽  
Author(s):  
Lucas F.S. ◽  
Richard F. ◽  
Adolphe Y. ◽  
Haenn S. ◽  
Moilleron R. ◽  
...  
Keyword(s):  
Bacterial Diversity ◽  
Molecular Analysis

Compressive response of some agricultural soils influenced by the mineralogy and moisture

2013 ◽  
Vol 27 (3) ◽  
pp. 239-246 ◽  
Author(s):  
A.E. Ajayi ◽  
M.S. Dias Junior ◽  
N. Curi ◽  
I. Oladipo
Keyword(s):  
Agricultural Soils ◽  
Tropical Soils ◽  
Homogeneity Test ◽  
Confined Compression ◽  
Moisture Retention ◽  
Soil Mineralogy ◽  
Undisturbed Soil ◽  
Statistical Homogeneity ◽  
Compressive Response ◽  
Fine Clay

Abstract This study aimed to investigate the mineralogy, moisture retention, and the compressive response of two agricultural soils from South West Nigeria. Undisturbed soil cores at the A and B horizons were collected and used in chemical and hydrophysical characterization and confined compression test. X-ray diffractograms of oriented fine clay fractions were also obtained. Our results indicate the prevalence of kaolinite minerals relating to the weathering process in these tropical soils. Moisture retention by the core samples was typically low with pre-compression stress values ranging from50 to 300 kPa at both sites. Analyses of the shape of the compression curves highlight the influence of soil moisture in shifts from the bi-linear to S-shaped models. Statistical homogeneity test of the load bearing capacity parameters showed that the soil mineralogy influences the response to loading by these soils. These observations provide a physical basis for the previous classification series of the soils in the studied area. We showed that the internal strength attributes of the soil could be inferred from the mineralogical properties and stress history. This could assist in decisions on sustainable mechanization in a datapoor environment.

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