Responses of Biogeochemical Characteristics and Enzyme Activities in Sediment to Climate Warming under a Simulation Experiment in Geographically Isolated Wetlands of the Hulunbuir Grassland, China

Han, Liliang; Su, Derong; Lv, Shihai; Luo, Yan; Li, Xingfu; Jiao, Jiantao; Diao, Zhaoyan; Bu, He

doi:10.3390/ijerph14090968

Cited by 7 publications

(3 citation statements)

References 47 publications

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“…The increase in urease activity indicates that the application of XNRB-3 may increase the gross N mineralization rate because urease can catalyze the hydrolysis of urea into CO 2 and NH 4 + , as well as promote the soil nitrogen cycle ( Xu et al, 2015 ). The increase in invertase activity can promote the conversion of carbohydrates and increase the concentration of soil nutrients (e.g., N, P, and K) under the action of microorganisms and improve soil fertility ( Han et al, 2017 ). Strain XNRB-3 can increase AP activity, which increases the availability of soluble P and promotes plant growth ( Krämer, 2000 ).…”

Section: Discussionmentioning

confidence: 99%

The Phlorizin-Degrading Bacillus licheniformis XNRB-3 Mediates Soil Microorganisms to Alleviate Apple Replant Disease

et al. 2022

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In this study, an endophytic phlorizin-degrading Bacillus licheniformis XNRB-3 was isolated from the root tissue of healthy apple trees, and its control effect on apple replant disease (ARD) and how it alleviates the pathogen pressure via changes in soil microbiomes were studied. The addition of strain XNRB-3 in Fusarium infested soils significantly reduced the number of pathogens in the soil, thus resulting in a lower disease incidence, and the relative control effect on Fusarium oxysporum reached the highest of 66.11%. The fermentation broth can also protect the roots of the plants from Fusarium oxysporum, Fusarium moniliforme, Fusarium proliferatum, and Fusarium solani infection. These antagonistic effects were further validated using an in vitro assay in which the pathogen control was related to growth and spore germination inhibition via directly secreted antimicrobial substances and indirectly affecting the growth of pathogens. The secreted antimicrobial substances were identified using gas chromatography-mass spectrometry (GC-MS) technology. Among them, alpha-bisabolol and 2,4-di-tert-butylphenol had significant inhibitory effects on many planted pathogenic fungi. Butanedioic acid, monomethyl ester, and dibutyl phthalate promoted root development of Arabidopsis plants. Strain XNRB-3 has multifarious plant growth promoting traits and antagonistic potential. In pot and field experiments, the addition of strain XNRB-3 significantly promoted the growth of plants, and the activity of enzymes related to disease resistance [superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)] was also significantly enhanced. It also reduced the abundance of four species of Fusarium and the content of phenolic acids in the rhizosphere soil, improved soil microbial community structure and nutritional conditions, and increased soil microbial diversity and activity, as well as the soil enzyme activity. The above results indicated that B. licheniformis XNRB-3 could be developed into a promising biocontrol and plant-growth-promoting agent.

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Section: Discussionmentioning

confidence: 99%

The Phlorizin-Degrading Bacillus licheniformis XNRB-3 Mediates Soil Microorganisms to Alleviate Apple Replant Disease

et al. 2022

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“…The increase in invertase activity can promote the conversion of carbohydrates and increase the concentration of soil nutrients (e.g. N, P, K) under the action of microorganisms and improve soil fertility (Han et al, 2017).…”

Section: Effect Of Strain Xnrb-3 On the Soil Environmentmentioning

confidence: 99%

Biocontrol Potential of The Phloridin-Degrading Bacillus Licheniformis XNRB-3 Against Apple Replant Disease

Duan

Zhao

Weitao

et al. 2021

Preprint

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Background: Apple replant disease (ARD) is a common occurrence in many major apple-growing areas worldwide, seriously hindering the development of the apple industry. To avoid the shortcomings of chemical fungicides currently used to control ARD, it is necessary to find sustainable and effective control methods. Here, an endophytic phloridin-degrading Bacillus licheniformis XNRB-3 was isolated from the root tissue of healthy apple trees, and its control effect on apple replant disease (ARD) and its how to alleviates the pathogen pressure via changes in soil microbiomes were studied.Results: The addition of strain XNRB-3 in Fusarium infested soils significantly reduced the number of pathogens in the soil, thus resulting in a lower disease incidence, and the relative control effect reached more than 60%. The fermentation broth can also protect the roots of the plants from Fusarium infection. These antagonistic effects were further validated using an in vitro assay in which the pathogen control was related to growth and spore germination inhibition via directly secreted antimicrobial substances and and indirect interspecific competition for nutrients. The antifungal organic compounds in the fermentation metabolites were identified using GC-MS technology. Among them, alpha-bisabolol and 2,4-di-tert-butylphenol had significant inhibitory effects on many planted pathogenic fungi. Butanedioic acid, monomethyl ester, and dibutyl phthalate can promote the root elongation and lateral root development of Arabidopsis plants. The potential of strain XNRB-3 to control ARD was later validated using microbial fertilizer inoculation in pot and field experiment. The addition of strain XNRB-3 significantly promoted the growth of plants, and the activity of enzymes related to disease resistance (SOD, POD, and CAT) was also significantly enhanced. It also reduced the abundance of Fusarium and the content of phenolic acids in the rhizosphere soil, improved soil microbial community structure and nutritional conditions, and increased soil microbial diversity and activity, as well as soil enzyme activity. Conclusions: The incorporation of strain XNRB-3 in the soil alleviated the damage of soil-borne pathogens to plants by reducing the relative abundance of pathogenic fungi and the content of phenolic acids, and inducing disease resistance of plants. Taken together, B. licheniformis XNRB-3 could be developed into a promising biocontrol and plant-growth-promoting agent. This provides a new management strategy to control ARD.

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“…Further, soil C conversion status, soil respiration intensity, soil bacterial abundance were positively affected by PGPR applied in the arti cial soil in China (Fu et al 2018), which is in line with our nding that soil sucrase activity was increased upon bacterial fertilizer treatment. Soil urease activity has been reported to potentially re ect soil organic nitrogen supply and soil nutrient transformation (Han et al 2017). (Pérez-Montaño et al 2014) reported that PGPR applied may increase plant species diversity through bene ts to plants from the host-PGPR interactions, and thus provide the hydrolysate (mainly microorganisms and litterfall) for urease in an agricultural system.…”

Section: Effect Of Fs and Bf On Soil Enzyme Activitymentioning

confidence: 99%

Long-Term Bacterial Fertilizer Application Improves Eucalyptus Growth and Yields through Altering Soil Quality

Ren

Qin

et al. 2020

Preprint

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Sludge and plant growth-promoting rhizobacteria (PGPR) are widely used to improve soil quality and plant growth. In this study we aim to determine the responses of soil enzyme activities, soil nutrient contents and plant growth to fertilization with sludge and PGPR (Bacillus megaterium strain DU07). To achieve this goal, we planted bare-root eucalyptus seedlings with soil amended with (1) filtered sludge from sugar factory (FS), (2) filtered sludge + PGPR (BF) and (3) non-amended soil (control). Soil properties (soil nutrients and soil extracellular enzymatic activities) and eucalyptus growth (diameter, height and stem volume) were studied 3, 6, 9 and 12 months after treatments. Results indicated that BF significantly increased plant height, diameter, and stem volume after the sixth month. Principal component analysis (PCA) showed that soil quality was significantly increased by BF during our trial period, especially after the ninth month. The pooled regression model indicated that soil quality significantly and positively affected eucalyptus yield, whereas soil TN was negatively and significantly related to plant stem volume. Hence, our study indicates that the application of a bacterial fertilizer increases plant growth and yield via increasing soil quality. Thus, our findings suggest that PGPR amendments could be useful as bio-fertilizer to improve soil-plant interactions in eucalyptus plantations.

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Responses of Biogeochemical Characteristics and Enzyme Activities in Sediment to Climate Warming under a Simulation Experiment in Geographically Isolated Wetlands of the Hulunbuir Grassland, China

Cited by 7 publications

References 47 publications

The Phlorizin-Degrading Bacillus licheniformis XNRB-3 Mediates Soil Microorganisms to Alleviate Apple Replant Disease

The Phlorizin-Degrading Bacillus licheniformis XNRB-3 Mediates Soil Microorganisms to Alleviate Apple Replant Disease

Biocontrol Potential of The Phloridin-Degrading Bacillus Licheniformis XNRB-3 Against Apple Replant Disease

Long-Term Bacterial Fertilizer Application Improves Eucalyptus Growth and Yields through Altering Soil Quality

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