scholarly journals Effects of Cropping Practice on Bupleurum Chinense Rhizosphere Microbial Community

2021 ◽  
Author(s):  
Li Liu ◽  
Hailu Cao ◽  
Yannan Geng ◽  
Ya Fan ◽  
Haiyang Feng ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Rhizosphere Soil ◽  
Soil Microbial Communities ◽  
Chemical Properties ◽  
Alpha Diversity ◽  
Soil Chemical Properties ◽  
Continuous Cropping ◽  
Factors Affecting ◽  
Soil Microbial ◽  
Cropping Practices

Abstract It is of great importance to understand the effects of cropping practices of Bupleurum chinense on the properties of rhizosphere soil. Therefore, the chemical properties of rhizosphere soil and the rhizosphere microbiome were assessed in the field trial with Bupleurum and three cropping practices (continuous monocropping, Bupleurum-corn intercropping and Bupleurum-corn rotation). The results showed cropping practices changed the chemical properties of the rhizosphere soil and composition, structure and diversity of the rhizosphere microbial communities. Continuous monocropping of Bupleurum chinense not only decreased soil pH and the contents of NO3--N and available K, but also decreased the alpha diversity of bacteria and beneficial microorganisms. However, Bupleurum-corn rotation improved soil chemical properties and reduced the abundance of harmful microorganisms. Soil chemical properties, especially the contents of NH4+-N, soil organic matter (SOM) and available K, were the key factors affecting the structure and composition of microbial communities in the rhizosphere soil. These findings could provide a new basis for overcoming problems associated with continuous cropping and promote development of B. chinense planting industry by improving soil microbial communities.

scholarly journals Continuous monocropping highly affect the composition and diversity of microbial communities in peanut (Arachis hypogaea L.)

2021 ◽  
Vol 49 (4) ◽  
pp. 12532
Author(s):  
Ali I. MALLANO ◽  
Xianli ZHAO ◽  
Yanling SUN ◽  
Guangpin JIANG ◽  
Huang CHAO
Keyword(s):  
Microbial Communities ◽  
Management Practices ◽  
Rhizosphere Soil ◽  
Diversity Index ◽  
Cropping Systems ◽  
Soil Microbial Communities ◽  
Pathogenic Fungi ◽  
Continuous Cropping ◽  
Bacterial Phyla ◽  
Soil Microbial

Continuous cropping systems are the leading cause of decreased soil biological environments in terms of unstable microbial population and diversity index. Nonetheless, their responses to consecutive peanut monocropping cycles have not been thoroughly investigated. In this study, the structure and abundance of microbial communities were characterized using pyrosequencing-based approach in peanut monocropping cycles for three consecutive years. The results showed that continuous peanut cultivation led to a substantial decrease in soil microbial abundance and diversity from initial cropping cycle (T1) to later cropping cycle (T3). Peanut rhizosphere soil had Actinobacteria, Protobacteria, and Gemmatimonadetes as the major bacterial phyla. Ascomycota, Basidiomycota were the major fungal phylum, while Crenarchaeota and Euryarchaeota were the most dominant phyla of archaea. Several bacterial, fungal and archaeal taxa were significantly changed in abundance under continuous peanut cultivation. Bacterial orders, Actinomycetales, Rhodospirillales and Sphingomonadales showed decreasing trends from T1>T2>T3. While, pathogenic fungi Phoma was increased and beneficial fungal taxa Glomeraceae decreased under continuous monocropping. Moreover, Archaeal order Nitrososphaerales observed less abundant in first two cycles (T1&T2), however, it increased in third cycle (T3), whereas, Thermoplasmata exhibit decreased trends throughout consecutive monocropping. Taken together, we have shown the taxonomic profiles of peanut rhizosphere communities that were affected by continuous peanut monocropping. The results obtained from this study pave ways towards a better understanding of the peanut rhizosphere soil microbial communities in response to continuous cropping cycles, which could be used as bioindicator to monitor soil quality, plant health and land management practices.

The invasive potential of a hybrid species: insights from soil chemical properties and soil microbial communities

2019 ◽  
Vol 13 (1) ◽  
pp. 20-26
Author(s):  
Feng Sun ◽  
Yuyi Ou ◽  
Qiaojing Ou ◽  
Lingda Zeng ◽  
Hanxia Yu ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Photosynthetic Rate ◽  
Soil Microbial Communities ◽  
Chemical Properties ◽  
Soil Chemical Properties ◽  
Natural Hybridization ◽  
Total Biomass ◽  
Invasive Potential ◽  
Soil Microbial ◽  
Significant Difference

Abstract Aims Natural hybridization between invasive and native species, as a form of adaptive evolution, threatens biodiversity worldwide. However, the potential invasive mechanisms of hybrids remain essentially unexplored, especially insights from soil chemical properties and soil microbial communities. Methods In a field experiment, soil microbial community, potassium-solubilizing bacteria, phosphorus-solubilizing bacteria, enzyme activities, and light-saturated photosynthetic rate were measured in invasive Sphagneticola trilobata and its hybrid with native Sphagneticola calendulacea in 2 years. Important Findings In general, soil dissolved organic carbon and the biomass of phosphorus-solubilizing bacteria were significantly higher under the hybrid treatment than S. trilobata and S. calendulacea. However, there were no significant differences in acid phosphatase, total PLFAs, bacterial PLFAs, fungi PLFAs, cellulase, and urase in these treatments. The hybrids had significantly higher light-saturated photosynthetic rate, photosynthetic nitrogen-, phosphorus-, potassium- use efficiencies than the invasive S. trilobata, but no significant difference with S. calendulacea. The total biomass and root biomass of hybrids were higher than S. calendulacea. Our results indicate that the hybrids species have a higher invasive potential than S. calendulacea, which may aggravate the local extinction of S. calendulacea in the future.

scholarly journals Biogeographic Changes in Forest Soil Microbial Communities of Offshore Islands—A Case Study of Remote Islands in Taiwan

Forests ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 4
Author(s):  
Ed-Haun Chang ◽  
Isheng Jason Tsai ◽  
Shih-Hao Jien ◽  
Guanglong Tian ◽  
Chih-Yu Chiu
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Microbial Communities ◽  
Phospholipid Fatty Acid ◽  
Soil Microbial Communities ◽  
Chemical Properties ◽  
Principal Component ◽  
Factors Affecting ◽  
Soil Microbial

Biogeographic separation has been an important cause of faunal and floral distribution; however, little is known about the differences in soil microbial communities across islands. In this study, we determined the structure of soil microbial communities by analyzing phospholipid fatty acid (PLFA) profiles and comparing enzymatic activities as well as soil physio-chemical properties across five subtropical granite-derived and two tropical volcanic (andesite-derived) islands in Taiwan. Among these islands, soil organic matter, pH, urease, and PLFA biomass were higher in the tropical andesite-derived than subtropical granite-derived islands. Principal component analysis of PLFAs separated these islands into three groups. The activities of soil enzymes such as phosphatase, β-glucosidase, and β-glucosaminidase were positively correlated with soil organic matter and total nitrogen. Redundancy analysis of microbial communities and environmental factors showed that soil parent materials and the climatic difference are critical factors affecting soil organic matter and pH, and consequently the microbial community structure.

scholarly journals Artificial Plantation Responses to Periodic Submergence in Massive Dam and Reservoir Riparian Zones: Changes in Soil Properties and Bacterial Community Characteristics

Biology ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 819 ◽  
Author(s):  
Jiajia Li ◽  
Lijuan Li ◽  
Muhammad Arif ◽  
Dongdong Ding ◽  
Xin Hu ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Microbial Communities ◽  
Rhizosphere Soil ◽  
Soil Microbial Communities ◽  
Chemical Properties ◽  
Riparian Zones ◽  
Woody Vegetation ◽  
Community Characteristics ◽  
Soil Microbial ◽  
Late Emergence

Plant and microbiome interactions are necessary for plant nutrient acquisition. However, relatively little is known about the responses of roots, bulk, and rhizosphere soil microbial communities in different artificial vegetation types (woody and herbaceous) in riparian areas of massive dams and reservoirs. Therefore, this study aims to assess such responses at elevations of 165–170 m a.s.l. in the riparian zones of the Three Gorges Dam Reservoir, China. The samples were collected containing the rhizosphere soil, bulk soil, and roots of herbaceous and woody vegetation at different emergence stages in 2018. Then, all the samples were analyzed to quantify the soil properties, bacterial community characteristics, and their interaction in the early and late emergence phases. In different periods, the weight of dominant soil bacteria, including Proteobacteria, Acidobacteria, Actinobacteria, Chloroflexi, and Cyanobacteria, was higher, and their composition was different in the rhizosphere, bulk soil, and endophytes. Moreover, the soil co-occurrence networks indicated that the weight of soil physical properties was higher than chemical properties in the early emergence stage. In contrast, the weight of chemical properties was relatively higher in the late emergence stage. Furthermore, the richness and diversity of the bacterial community were mainly affected by soil organic matter. This study suggests that these herbaceous and woody vegetation are suitable for planting in reservoir areas affected by hydrology and human disturbance in light of soil nutrients and soil microbial communities, respectively. Additionally, these results provide valuable information to inoculate the soil with key microbiota members by applying fertilizers, potentially improving plant health and soil production.

Alleviating Continuous Monocropping Obstacle in Melon: Biological Elimination of Phenolic Acid

2020 ◽  
Author(s):  
Huiqin Xie ◽  
Yongli Ku ◽  
Xiangna Yang ◽  
Le Cao ◽  
Xueli Mei ◽  
...  
Keyword(s):  
Microbial Community ◽  
Microbial Communities ◽  
Phenolic Acids ◽  
Fruit Quality ◽  
High Performance ◽  
Soil Microbial Communities ◽  
Illumina Miseq ◽  
Continuous Cropping ◽  
Soil Microbial

Abstract Background: Melon (Cucumis melo L.) is one of the most important fruit crops grown in China. However, the yield and quality of melon have significantly declined under continuous cropping. Phenolic acids are believed to be associated with the continuous monocropping obstacle (CMO) and can influence plant microbe interactions. Coumaric acid (CA) is one of the major phenolic acids found in melon root exudates. The objectives of this study were to estimate the elimination of CA by the soil bacterium K3 as well as its effects on mitigating melon CMO. CA degradation was investigated by monitoring the CA retained in the growth medium using high performance liquid chromatography (HPLC). The effects of CA and K3 on rhizosphere soil microbial communities were investigated by the spread plate method and Illumina MiSeq sequencing. Furthermore, the effects of CA and K3 on melon seedling growth were measured under potted conditions. The changes in soil enzymes and fruit quality under K3 amendment were examined in a greenhouse experiment. Result:The results suggest that the addition of CA had the same result as the CMO, such as deterioration of the microbial community and slower growth of melon plants. HPLC and microbial analysis showed that K3 had a pronounced ability to decompose CA and could improve the soil microbial community environment. Soil inoculation with K3 agent could significantly improve the fruit quality of melon.Conclusion: Our results show that the effects of K3 in the soil are reflected by changes in populations and diversity of soil microbes and suggest that deterioration of microbial communities in soil might be associated with the growth constraint of melon in continuous monoculture systems.

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