The “soil microbial loop” is not always needed to explain protozoan stimulation of plants

2009 ◽  
Vol 41 (11) ◽  
pp. 2336-2342 ◽  
Author(s):  
Flemming Ekelund ◽  
Stephane Saj ◽  
Mette Vestergård ◽  
Joanne Bertaux ◽  
Juha Mikola
Keyword(s):  
Microbial Loop ◽  
Soil Microbial ◽  
Stimulation Of

scholarly journals Poplar-Assisted Bioremediation for Recovering a PCB and Heavy-Metal-Contaminated Area

Agriculture ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 689
Author(s):  
Valeria Ancona ◽  
Ida Rascio ◽  
Giorgia Aimola ◽  
Claudia Campanale ◽  
Paola Grenni ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Southern Italy ◽  
Organic Carbon Content ◽  
Contaminant Removal ◽  
Soil Microbial ◽  
Treated Area ◽  
Legal Limits ◽  
Bacterial Groups ◽  
Contaminated Area ◽  
Stimulation Of

A Monviso clone has been applied to promote PCB degradation in a soil historically contaminated by polychlorinated biphenyls (PCBs) and heavy metals (HMs). The multi-contaminated area is located in Southern Italy. PCBs, HMs, and the soil microbial community (abundance, viability, and structure) were analysed in selected plots of the poplar-treated area. At 900 days after poplar planting, chemical analyses showed that PCBs and most of HMs diminished under the Italian legal limits. The overall results suggest that the poplar clone was effective in promoting PCB rhizodegradation and HM phytostabilization. Organic carbon content increased strongly in the rhizosphere of the planted plots. Microbiological results highlighted an overall increase in microbial abundance, cell viability, and the presence of bacterial groups involved in PCB degradation. The poplar-based bioremediation technology is a nature-based solution able to promote the recovery of soil quality in terms of contaminant removal, increase in organic carbon, and stimulation of autochthonous bacterial groups able to transform PCBs.

Soil microbial activity as influenced by compaction and straw mulching

2012 ◽  
Vol 26 (1) ◽  
pp. 65-69 ◽  
Author(s):  
A. Siczek ◽  
M. Frąc
Keyword(s):  
Microbial Activity ◽  
Soil Compaction ◽  
Soil Microbial Activity ◽  
Acid Phosphatases ◽  
Compacted Soil ◽  
Straw Mulching ◽  
Soil Microbial ◽  
Total Bacteria ◽  
Alkaline And Acid Phosphatases ◽  
Stimulation Of

Soil microbial activity as influenced by compaction and straw mulchingField study was performed on Haplic Luvisol soil to determine the effects of soil compaction and straw mulching on microbial parameters of soil under soybean. Treatments with different compaction were established on unmulched and mulched with straw soil. The effect of soil compaction and straw mulching on the total bacteria number and activities of dehydrogenases, protease, alkaline and acid phosphatases was studied. The results of study indicated the decrease of enzymes activities in strongly compacted soil and their increase in medium compacted soil as compared to no-compacted treatment. Mulch application caused stimulation of the bacteria total number and enzymatic activity in the soil under all compaction levels. Compaction and mulch effects were significant for all analyzed microbial parameters (P<0.001).

scholarly journals Increased microbial sequestration of soil organic carbon under nitrogen deposition over China’s terrestrial ecosystems

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Shu Liao ◽  
Siyi Tan ◽  
Yan Peng ◽  
Dingyi Wang ◽  
Xiangyin Ni ◽  
...  
Keyword(s):  
Meta Analysis ◽  
Terrestrial Ecosystems ◽  
N Deposition ◽  
N Addition ◽  
Soil Organic C ◽  
Organic C ◽  
Soil Microbial ◽  
Biomass Turnover ◽  
Microbial Residues ◽  
Stimulation Of

Abstract Background China’s terrestrial ecosystems have been receiving increasing amounts of reactive nitrogen (N) over recent decades. External N inputs profoundly change microbially mediated soil carbon (C) dynamics, but how elevated N affects the soil organic C that is derived from microbial residues is not fully understood. Here, we evaluated the changes in soil microbial necromass C under N addition at 11 forest, grassland, and cropland sites over China’s terrestrial ecosystems through a meta-analysis based on available data from published articles. Results Microbial necromass C accounted for an average of 49.5% of the total soil organic C across the studied sites, with higher values observed in croplands (53.0%) and lower values in forests (38.6%). Microbial necromass C was significantly increased by 9.5% after N addition, regardless of N forms, with greater stimulation observed for fungal (+ 11.2%) than bacterial (+ 4.5%) necromass C. This increase in microbial necromass C under elevated N was greater under longer experimental periods but showed little variation among different N application rates. The stimulation of soil microbial necromass C under elevated N was proportional to the change in soil organic C. Conclusions The stimulation of microbial residues after biomass turnover is an important pathway for the observed increase in soil organic C under N deposition across China’s terrestrial ecosystems.

Stimulation of earthworms (Eisenia fetida) on soil microbial communities to promote metolachlor degradation

2019 ◽  
Vol 248 ◽  
pp. 219-228 ◽  
Author(s):  
Yang Sun ◽  
Lixia Zhao ◽  
Xiaojing Li ◽  
Yueqi Hao ◽  
Huijuan Xu ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Eisenia Fetida ◽  
Soil Microbial Communities ◽  
Soil Microbial ◽  
Stimulation Of

Stimulation of soil microbial functioning by elevated CO2 may surpass effects mediated by irrigation in a semiarid grassland

Geoderma ◽  
2021 ◽  
Vol 401 ◽  
pp. 115162
Author(s):  
Hao Yu ◽  
Ye Deng ◽  
Zhili He ◽  
Elise Pendall ◽  
Yolima Carrillo ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Semiarid Grassland ◽  
Soil Microbial ◽  
Stimulation Of

scholarly journals Nitrogen enrichment causes thermal acclimation of soil microbial respiration

2021 ◽  
Author(s):  
Huimin Sun ◽  
Hongyang Chen ◽  
Jintao Li ◽  
Yan Zhang ◽  
Xiang Liu ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Soil Acidification ◽  
Microbial Respiration ◽  
Thermal Acclimation ◽  
Nitrogen Enrichment ◽  
Soil C ◽  
Soil Microbial ◽  
Positive Effect ◽  
Over Time ◽  
Stimulation Of

The feedback between soil carbon (C) and climate has the potential to decrease in magnitude over time due to the thermal acclimation of microbial respiration, while, whose strength is highly uncertain, partly because the response of microbial respiration is regulated by multiple environmental factors simultaneously rather than by temperature alone. Using a 9-year two-way factorial experiment involving warming and multilevel nitrogen enrichment treatments from an alpine grassland, we show that microbial respiration acclimates to warming only under nitrogen enrichment and that the strength of thermal acclimation increases as nitrogen enrichment. We identified two contrasting pathways—via an enhancement of acclimation by soil acidification and a weakening of acclimation by the inhibition of soil C availability and stimulation of soil C-degrading enzymes—with a net positive effect of nitrogen enrichment on microbial thermal acclimation. Our findings emphasize the importance of considering multiple environmental factors in shaping the strength of thermal acclimation.

Effects of 5-5'-Diphenyl-2-thiohydantoin (DPTH) and Thyroxine on the Ultrastructure and Chemical Composition of Rat Liver

1971 ◽  
Vol 29 ◽  
pp. 570-571
Author(s):  
E. A. Elfont ◽  
R. B. Tobin ◽  
D. G. Colton ◽  
M. A. Mehlman
Keyword(s):  
Chemical Composition ◽  
Rat Liver ◽  
Future Study ◽  
Mode Of Action ◽  
Liver Mitochondria ◽  
Rat Liver Mitochondria ◽  
Effective Inhibitor ◽  
Biochemical Effects ◽  
Glycerophosphate Dehydrogenase ◽  
Stimulation Of

Summary5,-5'-diphenyl-2-thiohydantoin (DPTH) is an effective inhibitor of thyroxine (T4) stimulation of α-glycerophosphate dehydrogenase in rat liver mitochondria. Because this finding indicated a possible tool for future study of the mode of action of thyroxine, the ultrastructural and biochemical effects of DPTH and/or thyroxine on rat liver mere investigated.Rats were fed either standard or DPTH (0.06%) diet for 30 days before T4 (250 ug/kg/day) was injected. Injection of T4 occurred daily for 10 days prior to sacrifice. After removal of the liver and kidneys, part of the tissue was frozen at -50°C for later biocheailcal analyses, while the rest was prefixed in buffered 3.5X glutaraldehyde (390 mOs) and post-fixed in buffered 1Z OsO4 (376 mOs). Tissues were embedded in Araldlte 502 and the sections examined in a Zeiss EM 9S.Hepatocytes from hyperthyroid rats (Fig. 2) demonstrated enlarged and more numerous mitochondria than those of controls (Fig. 1). Glycogen was almost totally absent from the cytoplasm of the T4-treated rats.

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