scholarly journals Effects of wheat root exudates on bacterial communities in the rhizosphere of watermelon

2021 ◽  
Vol 67 (No. 12) ◽  
pp. 721-728
Author(s):  
Jibo Shi ◽  
Xiaoya Gong ◽  
Muhammad Khashi u Rahman ◽  
Qing Tian ◽  
Xingang Zhou ◽  
...  

In this study, we investigated the effects of wheat root exudates on soil bacterial communities in the watermelon rhizosphere using quantitative PCR and Illumina MiSeq sequencing. The qPCR results showed that wheat root exudates significantly increased the abundance of total bacteria, Pseudomonas, Bacillus and Streptomyces spp. Illumina MiSeq sequencing results showed that wheat root exudates significantly changed the bacterial community structure and composition. These results indicated that plant root exudates play a role in plant-to-plant signalling, strongly affect the microbial community composition.  

2020 ◽  
Vol 20 (5) ◽  
pp. 966-980
Author(s):  
Maneet Kumar Chakrawarti ◽  
Madhuri Singh ◽  
Vijay Pal Yadav ◽  
Kasturi Mukhopadhyay

Parasitology ◽  
2018 ◽  
Vol 146 (4) ◽  
pp. 533-542 ◽  
Author(s):  
O. Benedicenti ◽  
C. J. Secombes ◽  
C. Collins

AbstractPopulation growth,in vitro, of threeParamoeba peruranscultures, one polyclonal (G) and two clonal (B8, CE6, derived from G), previously shown to differ in virulence (B8 > G > CE6), was compared at 10 and 15 °C. B8 showed a significantly higher increase in attached and in suspended amoebae over time at 15 and 10 °C, respectively. CE6 and G also had significantly higher numbers of suspended amoebae at 10 °C compared with 15 °C at experiment termination. However, in contrast to B8, numbers of attached amoebae were significantly higher at 10 °C in CE6 but showed a similar trend in G at the end of the experiment. Numbers of both suspended and attached amoebae were lower in B8 compared with CE6 and G. Significant differences in bacterial community composition and/or relative abundances were found, between cultures, between temperatures and between the same culture with and without amoebae, based on 16S rRNA Illumina MiSeq sequencing. Bacterial diversity was lower in B8 and CE6 compared with G, possibly reflecting selection during clonal isolation. The results indicate that polyclonalP. peruranspopulations may contain amoebae displaying different growth dynamics. Further studies are required to determine if these differences are linked to differences seen in the bacterial communities.


2021 ◽  
Vol 13 (13) ◽  
pp. 7358
Author(s):  
Dong-Hyun Kim ◽  
Hyun-Sik Yun ◽  
Young-Saeng Kim ◽  
Jong-Guk Kim

This study analyzed the microbial community metagenomically to determine the cause of the functionality of a livestock wastewater treatment facility that can effectively remove pollutants, such as ammonia and hydrogen sulfide. Illumina MiSeq sequencing was used in analyzing the composition and structure of the microbial community, and the 16S rRNA gene was used. Through Illumina MiSeq sequencing, information such as diversity indicators as well as the composition and structure of microbial communities present in the livestock wastewater treatment facility were obtained, and differences between microbial communities present in the investigated samples were compared. The number of reads, operational taxonomic units, and species richness were lower in influent sample (NLF), where the wastewater enters, than in effluent sample (NL), in which treated wastewater is found. This difference was greater in June 2019 than in January 2020, and the removal rates of ammonia (86.93%) and hydrogen sulfide (99.72%) were also higher in June 2019. In both areas, the community composition was similar in January 2020, whereas the influent sample (NLF) and effluent sample (NL) areas in June 2019 were dominated by Proteobacteria (76.23%) and Firmicutes (67.13%), respectively. Oleiphilaceae (40.89%) and Thioalkalibacteraceae (12.91%), which are related to ammonia and hydrogen sulfide removal, respectively, were identified in influent sample (NLF) in June 2019. They were more abundant in June 2019 than in January 2020. Therefore, the functionality of the livestock wastewater treatment facility was affected by characteristics, including the composition of the microbial community. Compared to Illumina MiSeq sequencing, fewer species were isolated and identified in both areas using culture-based methods, suggesting Illumina MiSeq sequencing as a powerful tool to determine the relevance of microbial communities for pollutant removal.


2016 ◽  
Vol 66 (3) ◽  
pp. 1293-1301 ◽  
Author(s):  
Weining Sun ◽  
Huazhi Xiao ◽  
Qian Peng ◽  
Qiaoge Zhang ◽  
Xingxing Li ◽  
...  

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Lulu Chen ◽  
Qiong Zhang ◽  
Yan Wang ◽  
Keke Zhang ◽  
Jing Zou

Abstract Background Extrinsic black stain (EBS) is characterized by discrete dark dots or lines on the tooth surface. The relationship between EBS and oral microbiota in children remains elusive. The aim of this study was to compare dental plaque microbiome in EBS children with that in EBS-free children in the primary dentition. Methods The Illumina MiSeq sequencing technique was utilized in the cross-sectional pilot study to investigate the diversity and composition of the supragingival plaque microbiota from 10 EBS-positive and 10 EBS-free children. The results were analysed with nonparametric Mann-Whitney U test, Pearson Chi-Square test, Fisher’s Exact test and one-way ANOVA tests. Results We identified 13 different phyla, 22 classes, 33 orders, 54 families, 105 genera, and 227 species from a total of 52,646 high-quality sequences. Between two groups, no statistical differences were observed in the estimators of community richness and diversity at 97% similarity, as well as in the Unweighted Unifrac principal co-ordinates analysis (PCoA). At the species level, higher level of relative abundance of Actinomyces naeslundii and lower level of relative abundance of a species belonging to Candidate_division_TM7 was observed in dental plaque of EBS-positive subjects, compared to dental plaque of EBS-free subjects (P < 0.05). This indicated that some species might be involved in the EBS process. Conclusion Changes in dental plaque microbiota is possibly relevant to the process of EBS in the primary dentition.


2018 ◽  
Vol 34 ◽  
pp. 25-36 ◽  
Author(s):  
Michelle A. Peck ◽  
Kimberly Sturk-Andreaggi ◽  
Jacqueline T. Thomas ◽  
Robert S. Oliver ◽  
Suzanne Barritt-Ross ◽  
...  

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