声明
摘要
Abstract
Table of content
List of Abbreviation
CHAPTER 1 General Introduction
1.1 Drought tolerance
1.2 Bacterial leaf blight resistance and yield loss
1.3 Cold tolerance
1.4 Genetic overlaps
1.5 Methodology
1.5.1 Technical route
1.5.2 Study Material
1.5.3 SNP genotyping
1.5.4 Linkage map construction and QTL mapping
1.6 Objective,scope and outline of the thesis
CHAPTER 2 Breeding Accomplishments and Challenges
2.1 Rice botany
2.2 Origin and classification
2.2.1 Rice origin
2.2.2 Scientitic classification
2.3 Rice Domestication Land marks
2.3.1 Elimination of seed shattering
2.3.2 Seed coat color
2.4 Rice production trends
2.5 Rice breeding Advances
2.5.1 Selection
2.5.2 Hybridization Breeding
2.5.3.Tissue culture
2.5.4 Molecular breeding
2.5.6 Genetic engineering
CHAPTER 3 Genetic Variation,Heritability and QTL analysis under Drought Stress and Irrigation Conditions in extreme lines
3.1 Summary
3.2 Introduction
3.3 Study Material
3.4 Methods
3.4.1 Field management and drought stress application
3.4.2 Phenotyping
3.4.3.Analysis
3.5 Results and Discussion
3.5.1 Drought Resistant Genotypes
3.5.2.Phenotypic characterization of the populations
3.5.3.Genetic Variation under Drought Stress and Normal Irrigation Conditions
3.5.4.Heritability and Performance of BILs under Different Water Regimes
3.5.5.Pearson’s Linear Correlation
3.5.6.Path Analyses for Direct and Indirect Effects
3.5.7 Quantitative trait locus(QTL)analysis
3.5.8.Overlapping QTLs
3.5.8.EPISTATIC Interactions(QE)
5.5.9.Epistatic interactions
3.6 Discussion
3.6.1.Co-localization of QTLs of different traits
3.6.2.Effects of Genetic Background(GB)on the expressions of QTLs
3.7.Conclusion
CHAPTER 4 Associations between yield related traits and bacterial leaf blight(BB)resistances
4.1 Summary
4.2 Introduction
4.3 Methodology
4.3.1 Inoeulums preparation
4.3.2 BB inoculation and assessment
4.3.3 3 Flag leaf size measurements
4.3.4.Statistical analysis
4.4 Resuits
4.4.1.BB resistance genotypes
4.4.2 Lesion length distribution
4.4.3.Performances of yield related traits under BB stress and control conditions
4.4.4.Combining multiple BB resistance and grain yield
4.4.5 Correlation Analysis
4.4.6.Marker trait associations
4.4.7 QTL mapping results
4.5 Discussion
4.5.1 Bacterial leaf blight resistance
4.5.2 Epistasis QTLs in BB resistance
4.5.3 Overlapping QTLs for both BB resistance and yield related traits
4.5 Conclusion
CHAPTER 5 QTL mapping for low-temperature tolerance at reproduction stage in rice
5.1 Summary
5.2 Introduction
5.3 Methods
5.3.1 Identification of cold tolerance(CT)in rice at the reproductive stage
5.4 Result and Discussion
5.4.1 phenotype variations
5.4.2 Correlations among yield related traits in low-temperature conditions
5.4.3 Heritability and Performance of BILs under Low-temperature
5.4.4.Selected cold tolerant lines
5.4.5.QTL tolerant at reproductive stage
5.5.6 Overlapping Cold tolerance QTLs
5.6.Conclusion
Chapter 6 Genetic overlap between Bacterial blight,drought and low temperature stresses in rice
6.1 Summary
6.2 Introduction
6.3 Results
6.3.1 BILs and parents performance
6.3.2 Correlations between Drought Tolerance and BB resistant related Traits
6.3.3 Introgression patterns of multiple tolerant lines
6.4 Discussion
6.4.1 Overlap of drought tolerance BB resistance and low-temperature QTLs
6.5.Conclusion
CHAPTER 7 General Discussion
7.1 Introduction
7.2 Genetic variation,heritability and performance of BILs under DS,BB,LT and normal irrigation
7.3 Genetic inheritance of physiological and productivity traits
7.4 QTL Co-localization and genetic overlaps between drought,BB and LT stresses
7.5 Conclusions and implications for improving drought tolerance,BB resistance,and low-temperature tolerances in rice
Reference
Acknowledgements
Bibliography