声明
CONTENTS
Abstract
摘要
Chapter 1.LITERATURE REVIEW
1.1.1 Lepidopteran insect pests
1.1.3 Common Name
1.1.4 Classification
1.1.5 Economic importance
1.1.6 Morphology
1.1.7 Life cycle
1.1.8 Insecticide Resistance in Spodoptera litura
1.1.9 Plant-Insect Interactions
1.2 Acetylcholinesterase
1.2.1 Distribution of Acetylcholinesterase
1.2.2 Insecticide Target Sites and Structural Biology of Acetylcholinesterase
1.2.3 Acetylcholinesterase insecticide Resistance Mechanisms
1.2.4 Gene encoding acetylcholinesterase in insects
1.3 RNA interference
1.3.1 RNA interference
1.3.2 A short history of the innovation of RNAi
1.3.3 RNAi Pathways and Mechanism
1.3.4 Use of RNAi
1.4 RNAi in insects
1.4.1 Preliminary RNAi trials in insects
1.4.2 Study on the function of insect genes using RNAi methods
1.4.3 Techniques of dsRNA transfer to Insects
1.4.4 Use of RNAi in insect pest control strategies
1.4.5 Susceptibility to RNAi
1.5 Objectives of the study
Chapter 2.Cloning and expression of two Ace genes in Spodoptera litura
2.1 Introduction
2.2 Materials and Methods
2.2.1 Laboratory Equipment
2.2.2 Reagents and Expression vectors
2.2.3 Other Reagents
2.3 Methods
2.3.2 Insects
2.3.3 RNA extraction
2.3.4 First Strand cDNA Synthesis
2.3.6 Purification of DNA using DNA Gel Extraction Kit
2.3.7 DNA ligation with pGEM-T Easy Vector
2.3.8 Transformation of plasmid DNA into Bacteria host(E.coli)
2.3.9 Bacteria PCR
2.3.10 Phylogenetic analysis
2.3.11 SlAce genes expression pattern in different developmental stages and tissues
2.3.12 Statistical analysis
2.4 Results
2.4.1 Sequence analysis of Spodoptera litura AChE genes
2.4.2 SlAce genes expression profiles in S.litura
2.5 Discussion
2.6 Conclusion
Chapter 3.Functional analysis of two Ace genes in Spdoptera litura
3.1 Introduction
3.2 Methods
3.2.1 dsRNA synthesis and application
3.2.2 SlAce knockdown determination using qRT-PCR
3.2.3 Statistical analysis
3.3 Results
3.3.1 Gene silencing through larvae injection of dsSlAce
3.3.2 Injection with dsRNA delays pupation and emergence
3.3.3 dsAce2 injection affects egg laying,egg hatching and progeny development
3.4 Discussion
References
Appendix
Scientific Publications
Acknowledgements