| 摘要 | 第6-7页 |
| abstract | 第7-8页 |
| CHAPTER 1 General Introduction | 第18-45页 |
| 1.1 Introduction | 第18-21页 |
| 1.1.1 Research aims and objectives | 第21页 |
| 1.2 Literature review | 第21-44页 |
| 1.2.1 Rice environments and cropping systems | 第21-24页 |
| 1.2.2 Rice domestication and classification | 第24-28页 |
| 1.2.3 Evolution of grain yield improvement in rice | 第28-30页 |
| 1.2.4 The current understanding of the genetic and molecular controls of grain yield in rice | 第30-32页 |
| 1.2.5 Breeding strategies to break the glass ceiling of grain yield | 第32-36页 |
| 1.2.6 Influence of functional genomic tools on plant breeding for crop improvement | 第36-40页 |
| 1.2.7 Breeding for high yield and multiple stress tolerance | 第40-41页 |
| 1.2.8 Trends in Rice production across the world | 第41-44页 |
| 1.3. Scope and outline of the thesis | 第44-45页 |
| CHAPTER 2 Methodology | 第45-51页 |
| 2.1 Introduction | 第45页 |
| 2.2 Technical route | 第45-46页 |
| 2.3 Source of breeding materials | 第46页 |
| 2.4 Characteristics of target population environment (TPE) | 第46-47页 |
| 2.5 Screening for drought tolerance and RYMV resistance in target population environment | 第47-48页 |
| 2.6 Progeny testing experiments | 第48页 |
| 2.7 Screening for WTR1 Introgession lines for resistance to RYMV | 第48-50页 |
| 2.8 Genotyping of the WTR1 ILs | 第50-51页 |
| CHAPTER 3 Genetic Variability, trait Heritability, Associations, and Path Coefficient Analysis onYield and Yield component traits | 第51-71页 |
| 3.1 Introduction | 第51-52页 |
| 3.2 Methodology | 第52-54页 |
| 3.2.1 Study materials | 第52-53页 |
| 3.2.2 Methods | 第53页 |
| 3.2.3 Data analysis | 第53-54页 |
| 3.3 Results and discussion | 第54-70页 |
| 3.3.1 Genetic variation and Performance of the 65 ILs under WTR1 background | 第54-56页 |
| 3.3.2 Genetic variation and phenotypic characteristics of the yield component traits | 第56-59页 |
| 3.3.3 Heritability of the yield component traits under variable water regimes | 第59-61页 |
| 3.3.4 Association between high grain yield and yield component traits under variable water regimes | 第61-63页 |
| 3.3.5 Path coefficient analysis for direct and indirect effects of nine yield component traits on grain yield | 第63-66页 |
| 3.3.6 Selection of promising ILs | 第66-68页 |
| 3.3.7 Pyramid crosses of the WTR1 ILs for high grain yield and multiple trait tolerance | 第68-69页 |
| 3.3.8 screening of F2 progeny for drought tolerance at reproductive stage | 第69-70页 |
| 3.4 Conclusion | 第70-71页 |
| CHAPTER 4 Connotation of RYMV resistance on high grain yield traits in rice | 第71-90页 |
| 4.1 Introduction | 第71-73页 |
| 4.1.1 Natural resistance | 第71-73页 |
| 4.2 Methodology | 第73-74页 |
| 4.2.1 Materials | 第73页 |
| 4.2.2 Methods | 第73页 |
| 4.2.3 Molecular screening for the RYMV1 gene resistance to RYMV | 第73-74页 |
| 4.2.4 QTL analysis | 第74页 |
| 4.3 Results and discussion | 第74-89页 |
| 4.3.1 Response of WTR1 ILs to RYMV S4 strain | 第74-77页 |
| 4.3.2 Evaluation of gene resistance to RYMV contained in the identified 39 ILs | 第77-80页 |
| 4.3.3 Association of RYMV resistance QTL with high grain Yield QTL under irrigation and drought conditions | 第80-82页 |
| 4.3.4 Collocation between RYMV QTL and High grain yield QTL | 第82-89页 |
| 4.4 Conclusion | 第89-90页 |
| CHAPTER 5 The genes and QTL for yield under Multiple Biotic and abiotic stress | 第90-120页 |
| 5.1 Introduction | 第90-91页 |
| 5.2 Methodology | 第91-92页 |
| 5.2.1 Materials | 第91页 |
| 5.2.2 Data analysis | 第91-92页 |
| 5.3 Results and discussion | 第92-96页 |
| 5.3.1 Lead SNP (genes/QTL) with significant association with yield component traits | 第92-93页 |
| 5.3.2 Overlapping lead SNPs (Genes/QTL) for various yield component traits | 第93-96页 |
| 5.4 Conclusion | 第96-120页 |
| Overall conclusion and recommendation | 第120-122页 |
| 6.1 General conclusions | 第120-121页 |
| 6.2 Recommendations | 第121-122页 |
| References | 第122-136页 |
| Acknowlegments | 第136-137页 |
| Biographical scketch of the author | 第137页 |
