封面
声明
签名表
中文摘要
英文摘要
目录
ABBREVIATION
DEDICATION
CHAPTER ONE INTRODUCTION
1.1. Cotton
1.2. Leaf senescence
1.3. Environmental Factors Influencing Leaf Senescence
1.4. Involvement of Phytohormones in Leaf Senescence
1.5. NAC family and leaf senescence
1.6. Gene Cloning
1.7. Agrobacterium-mediated transformation
1.8. Virus-Induced gene silencing \(VIGS\)
1.9. Research Objective
CHAPTER TWO MATERIALS AND METHODS
2.1. Plant materials, growth conditions and stress assays
2.2. Total RNA isolation and cDNA synthesis
2.3. Cloning of GhNAC18 and GhNAC20 genes
2.4. Multiple Sequence Alignment and Phylogenetic Analysis
2.5. Bioinformatics analysis
2.6. Transcriptional activation activity of GhNAC18 and GhNAC20
2.7. Promoter Analysis
2.8. Quantitative RT-PCR assays
2.9. Construction of GhNAC18 plasmid and Arabidopsis transformation.
2.10. Plasmid construction for VIGS Assay and vector inoculation
2.11. Measurement of chlorophyll content
2.12. Experimental design and statistical analysis
CHAPTER THREE 3. RESULTS
3.1. Characterization and bioinformatics
3.2. Sequence analysis of GhNAC proteins.
3.3. Promoter analysis
3.4. Expression analysis of GhNAC18 and GhANC20 in different organs.
3.5. Phytohormone analysis on GhNAC18 and GhNAC20.
3.6. Expression of GhNAC18 and GhNAC20 under abiotic stress.
3.7. Transcriptional activation activity
3.8. Expression of the two genes during leaf senescence
3.9. Knockdown of GhNAC20 by VIGS delays leaf senescence in cotton
3.10. Overepresion of GhNAC18 in Arabidopsis
CHAPTER FOUR DISCUSSION
CONLUSION
参考文献
SUPPLEMENTARY INFORMATION
致谢
RESUME