| 摘要 | 第4-5页 |
| ABSTRACT | 第5页 |
| LIST OF ABBREVATIONS | 第8-14页 |
| CHAPTER 1 INTRODUCTION | 第14-35页 |
| 1.1 GENERAL INTRODUCTION | 第14-16页 |
| 1.2 REVIEW OF LITERATURE | 第16-34页 |
| 1.2.1 Function and organization of the root | 第16-17页 |
| 1.2.2 The RAM and SCN organization pattern of Arabidopsis thaliana | 第17-18页 |
| 1.2.3 Role of plant hormones on root growth and development | 第18-20页 |
| 1.2.4 Auxin | 第20-25页 |
| 1.2.4.1 Auxin biosynthesis, homeostasis and signaling pathway | 第20-22页 |
| 1.2.4.2 Auxin gradients and auxin transporters in root | 第22-24页 |
| 1.2.4.3 Auxin-ABA crosstalk and its role in root growth | 第24-25页 |
| 1.2.5 Multiple signaling control the root meristem activity | 第25-34页 |
| 1.2.5.1 Specification of the stem cell niche | 第25页 |
| 1.2.5.2 Maintainence of the stem cell niche | 第25-30页 |
| 1.2.5.2.1 WOX5-ACR4-CLE40 signaling pathway | 第26-28页 |
| 1.2.5.2.2 An auxin-dependent PLT-regulated pathway | 第28-29页 |
| 1.2.5.2.3 An auxin-independent SHR/SCR-regulated pathway | 第29-30页 |
| 1.2.5.3 Division, expansion and diffentiaion of meristem cell | 第30-34页 |
| 1.2.5.3.1 Auxin regulates cell proliferation and expansion | 第30-32页 |
| 1.2.5.3.2 ABA signal regulates meristem activity | 第32-33页 |
| 1.2.5.3.3 CLE40 and CRN/CLV2 signaling antagonistically control root meristem differentiation | 第33页 |
| 1.2.5.3.4 ROS controls transition from proliferation to differentiation | 第33-34页 |
| OBJECTIVES | 第34-35页 |
| CHAPTER 2 MATERIALS AND METHODS | 第35-38页 |
| Plant materials | 第35页 |
| Homozygous plant selection | 第35-36页 |
| Phenotype analysis | 第36-37页 |
| Microscopy observation | 第37页 |
| Statistical analyses | 第37-38页 |
| CHAPTER 3 RESULTS | 第38-63页 |
| 3.1 ABA inhibits root growth by reducing the root meristem activity in arf2-101 mutant | 第38-41页 |
| 3.2 ABA regulates meristem cell division through ARF2-mediated altration of PIN proteinsin Arabidopsis roots | 第41-51页 |
| 3.2.1 ARF2 alters the accumulation of PIN proteins under ABA treatment | 第41-43页 |
| 3.2.2 PIN1 and PIN4 play different roles in ABA-mediated root growth in arf2-101 | 第43-51页 |
| 3.3 ARF2 inhibits the QC division,which is reversely altered by ABA signaling | 第51-52页 |
| 3.4 ABA regulates PLT- mediated root meristem activity in ABA signaling | 第52-60页 |
| 3.4.1 ARF2 affects the expression PLT1 and PLT2 in root apical meristem in ABA signaling | 第52-54页 |
| 3.4.2 Overexpression of PLT2 promotes cell division and completely blocks celldifferentiation in arf2-101 | 第54-57页 |
| 3.4.3 ARF2 medlates meristem cell division in parallel with PLT1,but not with PLT2 | 第57-60页 |
| 3.5 ARF2 affects the ABA-mediated expression of SHR in root apical meristem | 第60-61页 |
| 3.6 ARF2 affects the ABA-mediated expression of PLT2,PIN1 and PIN4 in epidermal cell | 第61-63页 |
| CHAPTER 4 DISCUSSION AND CONCLUSION | 第63-65页 |
| REFERENCES | 第65-77页 |
| ACKNOWLEDGEMENTS | 第77-78页 |
| CURRICULUM VITAE | 第78页 |
