声明
Table of Contents
Abstract
摘要
Abbreviation list
Chapter 1 General Introduction
1.1 Insect-bacteria interactions
1.1.1 Symbiotic relation
1.1.2 Pathogenic relationship
1.2 The intestinal microbiota
1.2.1 The insect gut microbiota
1.2.2 Factors affecting the insect gut microbiota
1.3 Transmission pattern of gut bacteria in insects
1.3.1 Vertical transmission
1.3.2 Horizontal transmission
1.4 Benefits of bacterial symbiosis in insects
1.4.1 Defense against parasites
1.4.2 Development of resistance and immunity against pathogens
1.4.3 Role of bacteria in host thermoregulation
1.5 Bacterial symbiosis in tephritids fruit flies
1.6 Population genetics and structure
1.6.1 Genetic variation in populations
1.6.2 Natural selection
1.6.3 Mutations
1.6.4 Genetic drift
1.6.5 Gene flow
1.6.6 Genetic hitchhiking
1.6.7 Importance of Population genetics
1.7 Biology and the management of Bactrocera minax
1.7.1 Seasonal phenology
1.7.2 Management of Bactrocera minax
1.8 Objective of the proposed research
Chapter 2:Population Genetics and Structure of the Chinese Citrus Fly,Bactrocera minax (Diptera:Tephritidae) Based on Cytochrome c oxidase Ⅰ
2.1 Introduction
2.2 Materials and methods
2.2.1 Sample collection
2.2.2 Identification of B.minax
2.2.3 DNA extraction
2.2.5 Data analysis
2.2.6 Phylogenetic analyses
2.2.7 Genetic diversity within the population
2.3 Results
2.3.1 Identification of B.minax
2.3.2 Genetic diversity
2.3.3 Analysis of population variations
2.4 Discussion
Chapter 3:Isolation and identification of culturable enteric bacterial communities from Chinese Citrus Fly (Bactrocera minax)
3.1 Introduction
3.2 Material and methods
3.2.2 Gut extraction of B.minax and isolation of bacteria
3.2.3 Identification by using the biochemical method
3.2.4 DNA extraction and strain identification
3.3 Results
3.3.1 Bacteria identification
3.3.2 Confirmation of identified bacteria by 16S rRNA gene
3.4 Discussion
Chapter 4:Tissue localization of genetically modified GFP or RFP bacteria in the gut of B.minax
4.1 Introduction
4.2 Material and methods
4.2.1 Insects
4.2.2 Baeterial strain
4.2.3 Fluorescent plasmids
4.2.4 Feeding of GFP and RFP marked bacteria to B.minax
4.2.5 Observation of GFP or RFP-labelled bacteria in the intestinal tract of flies
4.2.6 Quantification of marked bacteria
4.2.7 Statistical Analysis
4.3 Results
4.3.1 Fluorescent plasmids expression
4.3.2 The spatiotemporal pattern of GFP-labeled Citrobacter braakii in B.minax
4.3.3 The spatiotemporal pattern of RFP marked Klebsiella pneumoniae in B.minax
4.3.4 The spatiotemporal pattern of RFP marked Klebsiella oxytoca in B.minax
4.4 Discussion
Chapter 5:The impact of bacteria on the fitness of the Chinese citrus fly,Bactrocera minax (Diptera:Tephritidae)
5.1 Introduction
5.2 Material and methods
5.2.1 Collection of B.minax samples
5.2.2 Selection of Antibiotics
5.2.3 Experimental diet and treatments
5.2.4 Feeding experiments
5.2.5 Statistical analysis
5.3 Results
5.3.1 Antibiotics susceptibility
5.3.2 Selection of antibiotics
5.3.3 The effects of bacteria and antibiotic supplementation on B.minax longevity
5.3.4 The effects of bacteria and antibiotic supplementation on B.minax fecundity
5.3.5 The effect of bacteria and antibiotics supplementation on B.minax mating
5.3.6 The effect of bacteria and antibiotics on B.minax dry weight and wing length
5.4 Discussion
Chapter 6.General discussions and Future Work
References
Acknowledgements
Curriculum vitae