scholarly journals Silicon Application Modulates the Growth, Rhizosphere Soil Characteristics, and Bacterial Community Structure in Sugarcane

2021 ◽  
Vol 12 ◽  
Author(s):  
Quanqing Deng ◽  
Taobing Yu ◽  
Zhen Zeng ◽  
Umair Ashraf ◽  
Qihan Shi ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Enzyme Activities ◽  
Bacterial Community Structure ◽  
Rhizosphere Soil ◽  
Chemical Properties ◽  
Soil Enzyme ◽  
Community Diversity ◽  
Soil Enzyme Activities ◽  
And Chemical Properties

Silicon (Si) deficiency, caused by acidic soil and rainy climate, is a major constraint for sugarcane production in southern China. Si application generally improves sugarcane growth; however, there are few studies on the relationships between enhanced plant growth, changes in rhizosphere soil, and bacterial communities. A field experiment was conducted to measure sugarcane agronomic traits, plant nutrient contents, rhizosphere soil enzyme activities and chemical properties, and the rhizosphere bacterial community diversity and structure of three predominant sugarcane varieties under two Si treatments, i.e., 0 and 200 kg of silicon dioxide (SiO2) ha−1 regarded as Si0 and Si200, respectively. Results showed that Si application substantially improved the sugarcane stalk fresh weight and Si, phosphorus (P), and potassium (K) contents comparing to Si0, and had an obvious impact on rhizosphere soil pH, available Si (ASi), available P (AP), available K (AK), total phosphorus (TP), and the activity of acid phosphatase. Furthermore, the relative abundances of Proteobacteria showed a remarkable increase in Si200, which may be the dominant group in sugarcane growth under Si application. Interestingly, the AP was noticed as a major factor that caused bacterial community structure differences between the two Si treatments according to canonical correspondence analysis (CCA). In addition, the association network analysis indicated that Si application enriched the rhizosphere bacterial network, which could be beneficial to sugarcane growth. Overall, appropriate Si application, i.e., 200 kg SiO2 ha−1 promoted sugarcane growth, changed rhizosphere soil enzyme activities and chemical properties, and bacterial community structures.

scholarly journals Impact of an intercropped melon/cowpea system on the coupling between soil bacterial community structure and chemical properties

2021 ◽  
Author(s):  
Jessica Cuartero ◽  
Jose Antonio Pascual ◽  
Juana-María Vivo ◽  
Onurcan Özbolat ◽  
Virginia Sánchez-Navarro ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Cucumis Melo ◽  
Bacterial Community Structure ◽  
Chemical Properties ◽  
First Year ◽  
Soil Bacterial Community Structure ◽  
Phosphorous Content ◽  
The Relationship ◽  
And Chemical Properties

Abstract A greater understanding of the relationship between soil microorganisms and intercropping systems could contribute to the optimization of land use, fostering sustainable and efficient agriculture. This study entails a comparative intercropping assay using cowpea (Vigna unguiculata) and melon (Cucumis melo) under organic management with different patterns and 30% less organic fertilization than that used in monocrops in the first year. The intercropping system changed the bacterial community structure independently of the intercropping pattern and contributed to an increase in soil nitrogen, phosphorous content and melon crop yield. The intercropped systems were characterized by a higher abundance of Pseudomonas (Proteobacteria), which are related to nutrient cycling, and other beneficial microorganisms.

scholarly journals Effect Mechanism of Land Consolidation on Soil Bacterial Community: A Case Study in Eastern China

2022 ◽  
Vol 19 (2) ◽  
pp. 845
Author(s):  
Yaoben Lin ◽  
Yanmei Ye ◽  
Shuchang Liu ◽  
Jiahao Wen ◽  
Danling Chen
Keyword(s):  
Heavy Metal ◽  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Soil Health ◽  
Chemical Properties ◽  
Sequencing Technology ◽  
Dominant Bacteria ◽  
Physical And Chemical ◽  
And Chemical Properties

Farmland consolidation is an effective tool to improve farmland infrastructures, soil quality, and sustain a healthy farmland ecosystem and rural population, generating contributions to food security and regional sustainable development. Previous studies showed that farmland consolidation regulates soil physical and chemical properties. Soil microorganisms also play an important role in soil health and crop performance; however, few studies reported how farmland consolidation influence soil microecology. Here, we used DNA sequencing technology to compare bacterial community structure in farmlands with and without consolidation. DNA sequencing technology is the most advanced technology used to obtain biological information in the world, and it has been widely used in the research of soil micro-ecological environment. In September 2018, we collected soil samples in Jiashan County, Zhejiang Province, China, and used DNA sequence technology to compare the bacterial community structure in farmlands with and without consolidation. Our results found that (1) farmland consolidation had significant impacts on soil microbial characteristics, which were mainly manifested as changes in microbial biomass, microbial diversity and community structure. Farmland consolidation can increase the relative abundance of the three dominant bacteria phyla and the three fungal dominant phyla, but it also negatively affects the relative abundance of the six dominant bacteria phyla and the three fungal dominant phyla. (2) Farmland consolidation had an indirect impact on soil bacterial community structure by adjusting the soil physical and chemical properties. (3) The impact of heavy metals on bacterial community structure varied significantly under different levels of heavy metal pollution in farmland consolidation areas. There were 6, 3, 3, and 5 bacterial genera that had significant correlations with heavy metal content in cultivated land with low pollution, light pollution, medium pollution, and heavy pollution, respectively. The number of heavy metal-tolerant bacteria in the soil generally increased first and then decreased under heavy metal polluted conditions. Our study untangled the relationship between varied farmland consolidation strategies and bacteria through soil physcicochemical properties and metal pollution conditions. Our results can guide farmland consolidation strategies and sustain soil health and ecological balance in agriculture.

scholarly journals The Effects of Organic and Mineral Fertilization on Soil Enzyme Activities and Bacterial Community in the Below- and Above-Ground Parts of Wheat

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1452
Author(s):  
Abdoulaye Amadou ◽  
Alin Song ◽  
Zhi-Xi Tang ◽  
Yanling Li ◽  
En-Zhao Wang ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Bacterial Diversity ◽  
Enzyme Activities ◽  
Organic Amendment ◽  
Mineral Fertilizer ◽  
Soil Enzyme ◽  
Community Diversity ◽  
Bulk Soil ◽  
Soil Enzyme Activities ◽  
Soil Rhizosphere

Bacterial community and soil enzymatic activity depend on soil and management conditions. Fertilization is an important approach to maintain and enhance enzyme activities and microbial community diversity. Although the effects of fertilizer application on soil microbial community and related parameters are explored, the effects on the soil microbiome associated with those of wheat plant organs, including those associated with roots and spikelets, are not well-known. Therefore, in this study, by using a sequencing approach, we assessed the effects of inorganic fertilizers, manure, and biochar on soil enzyme activities, bacterial community diversity and structure in the bulk soil, rhizosphere, roots, and spikelet of wheat (Triticumaestivum L.). For this, different treatment biochar (BC), manure (OM), low mineral fertilizer (HL), high mineral fertilizer (HF), and no fertilizer (FO) were used for the enzyme activities and bacterial community structure diversity tested. The result showed that organic amendment application increased total nitrogen, soil available phosphorus, and potassium compared to inorganic fertilizer and control, especially in the rhizosphere. Enzyme activities were generally higher in the rhizosphere than in the bulk soil and organic amendments increased activities of acid phosphatase (AcP), β-1,4-N-acetyl-glucosaminidase (NAG), and phenol oxydase (PhOx). Compared with soil and rhizosphere, bacterial diversity was lower in wheat roots and evenlower in the spikelet. From the bulk soil, rhizosphere to roots, the fertilization regimes maintained bacterial diversity, while organic amendment increased bacterial diversity in the spikelet. Fertilization regimes significantly influenced the relative abundances of 74 genera across 12 phyla in the four compartments. Interestingly, the relative abundance of Proteobacteria (Citrobacter, Pantoea, Pseudomonas, and unclassified Enterobacteriaceae) in the spikelet was decreased by increasing inorganic fertilizer and further by manure and biochar, whereas those of Actinobacteria (Microbacterium and an unclassified Microbacteriaceae) and Bacteroidetes (Hymenobacter and Chitinophagaceae) were increased. The results suggest that potential bacterial functions of both roots and above-ground parts of wheat would be changed by different organic amendment regimes (manure and biochar).

Heterotrophic Bacterial Community Structure of Multistage Biofilters in a Commercial Pufferfish Takifugu rubripes RAS

2013 ◽  
Vol 726-731 ◽  
pp. 1621-1627 ◽  
Author(s):  
Zhu Chen ◽  
Ying Liu ◽  
Liang Zi Liu ◽  
Xiao Jing Wang ◽  
Zhi Pei Liu ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Heterotrophic Bacteria ◽  
Diversity Index ◽  
Community Diversity ◽  
Takifugu Rubripes ◽  
Recirculating Aquaculture ◽  
Microbial Resources

The success of a recirculating aquaculture system (RAS) greatly depends on the structure, dynamics and activities of microbial community. Heterotrophic bacteria as the major members play various roles. The heterotrophic bacterial community structure in threestaged biofilters was studied using four different media. 228 isolates belonging to 77species were obtained and affiliated toGammaproteobacteria,Alphaproteobacteria,Bacteroidetes,Firmicutes,ActinobacteriaandBetaproteobacteria.Gammaproteobacteriawas the predominant group. The concurrence was found between potential pathogens (VibrioandShewanella) and probiotics (BacillusandPseudomonas). On the basis of community diversity index, we could infer that differences existed between stages, and the diversity index increased along the biofilters. A comprehensive understanding of microbial community in RAS will be in favor of utilization of microbial resources and optimizing the culture systems' operation.

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