scholarly journals Interplay of Darwinian and frequency-dependent selection in the host-associated microbial population

2005 ◽  
Vol 3 (3) ◽  
pp. 3-11
Author(s):  
Nikolay I Vorobyov ◽  
Nikolay A Provorov
Keyword(s):  
Mathematical Simulation ◽  
Microbial Population ◽  
Genetically Modified ◽  
Ecological Niches ◽  
Soil System ◽  
Selection Pressures ◽  
Frequency Dependent ◽  
Frequency Dependent Selection ◽  
Plant Soil ◽  
Balanced Polymorphism

The method for mathematical simulation is suggested to analyze the balanced polymorphism in rhizobia population generated due to the interplay of Darwinian and frequency-dependent selection. Analysis of the model suggested that this polymorphism is determined not only by the selection pressures but also by the capacities of ecological niches occupied by bacteria in the «plant-soil» system. The model may be used for analyzing the selective processes in various symbiotic systems and for predicting the consequences of releasing of genetically modified plant symbionts into environment.

scholarly journals Signatures of negative frequency dependent selection in colonisation factors and the evolution of a multi-drug resistant lineage of Escherichia coli

2018 ◽  
Author(s):  
Alan McNally ◽  
Teemu Kallonen ◽  
Christopher Connor ◽  
Khalil Abudahab ◽  
David M. Aanensen ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Treatment Options ◽  
Ecological Niches ◽  
Drug Resistant ◽  
Frequency Dependent ◽  
Frequency Dependent Selection ◽  
Public Health Burden ◽  
Increased Risk ◽  
Negative Frequency Dependent Selection ◽  
Tract Infections

AbstractEscherichia coli is a major cause of bloodstream and urinary tract infections globally. The wide dissemination of multi-drug resistant (MDR) strains of extra-intestinal pathogenic E. coli (ExPEC) poses a rapidly increasing public health burden due to narrowed treatment options and increased risk of failure to clear an infection. Here, we present a detailed population genomic analysis of the ExPEC ST131 clone, in which we seek explanations for its success as an emerging pathogenic strain beyond the acquisition of antimicrobial resistance (AMR) genes. We show evidence for evolution towards separate ecological niches for the main clades of ST131 and differential evolution of anaerobic metabolism, key colonisation and virulence factors. We further demonstrate that negative frequency-dependent selection acting across accessory loci is a major mechanism that has shaped the population evolution of this pathogen.

Frequency-Dependent Selection at the Payne Inversion in Drosophila melanogaster

Evolution ◽  
1973 ◽  
Vol 27 (4) ◽  
pp. 558 ◽  
Author(s):  
R. Nassar ◽  
H. J. Muhs ◽  
R. D. Cook
Keyword(s):  
Drosophila Melanogaster ◽  
Frequency Dependent ◽  
Frequency Dependent Selection

Distribution and migration of 95Zr in a tea plant/soil system

2006 ◽  
Vol 87 (2) ◽  
pp. 170-174 ◽  
Author(s):  
Jianjun Shi ◽  
Jiangfeng Guo
Keyword(s):  
Tea Plant ◽  
Soil System ◽  
Plant Soil ◽  
And Migration

Modelling the Balance of Metals in the Amended Soil for the Case of ‘Atmosphere–Plant–Soil’ System

2016 ◽  
Vol 21 (5) ◽  
pp. 577-590 ◽  
Author(s):  
Edita Baltrėnaitė ◽  
Arvydas Lietuvninkas ◽  
Pranas Baltrėnas
Keyword(s):  
Soil System ◽  
Plant Soil ◽  
Amended Soil

scholarly journals The response of soil and phyllosphere microbial communities to repeated application of the fungicide iprodione: accelerated biodegradation or toxicity?

2020 ◽  
Vol 96 (6) ◽  
Author(s):  
A Katsoula ◽  
S Vasileiadis ◽  
M Sapountzi ◽  
Dimitrios G Karpouzas
Keyword(s):  
Microbial Communities ◽  
Agricultural Production ◽  
Soil Microorganisms ◽  
Amplicon Sequencing ◽  
Fungal Communities ◽  
Similar Response ◽  
Repeated Application ◽  
Plant Leaves ◽  
Soil System ◽  
Plant Soil

ABSTRACT Pesticides interact with microorganisms in various ways with the outcome being negative or positive for the soil microbiota. Pesticides' effects on soil microorganisms have been studied extensively in soil but not in other pesticides-exposed microbial habitats like the phyllosphere. We tested the hypothesis that soil and phyllosphere support distinct microbial communities, but exhibit a similar response (accelerated biodegradation or toxicity) to repeated exposure to the fungicide iprodione. Pepper plants received four repeated foliage or soil applications of iprodione, which accelerated its degradation in soil (DT50_1st = 1.23 and DT50_4th = 0.48 days) and on plant leaves (DT50_1st > 365 and DT50_4th = 5.95 days). The composition of the epiphytic and soil bacterial and fungal communities, determined by amplicon sequencing, was significantly altered by iprodione. The archaeal epiphytic and soil communities responded differently; the former showed no response to iprodione. Three iprodione-degrading Paenarthrobacter strains were isolated from soil and phyllosphere. They hydrolyzed iprodione to 3,5-dichloraniline via the formation of 3,5-dichlorophenyl-carboxiamide and 3,5-dichlorophenylurea-acetate, a pathway shared by other soil-derived arthrobacters implying a phylogenetic specialization in iprodione biotransformation. Our results suggest that iprodione-repeated application could affect soil and epiphytic microbial communities with implications for the homeostasis of the plant–soil system and agricultural production.

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