| SUMMARY | 第15页 |
| CHAPTER 1 | 第20-25页 |
| 1. General introduction | 第20-25页 |
| 1.1 Introduction | 第20-23页 |
| 1.2 Research objectives | 第23-25页 |
| 1.2.1 General objective | 第23页 |
| 1.2.2 Specific objectives | 第23-25页 |
| CHAPTER 2 | 第25-36页 |
| 2 Review of literature | 第25-36页 |
| 2.1 Photosynthesis and high temperature stress | 第25-27页 |
| 2.2 Growth regulators and high temperature stress | 第27-30页 |
| 2.2.1 ABA and high temperature stress | 第27-28页 |
| 2.2.2 Cytokinin and high temperature stress | 第28-29页 |
| 2.2.3 BRs and high temperature stress | 第29-30页 |
| 2.3 High temperature stress and antioxidative enzyme activity | 第30-36页 |
| 2.3.1 Superoxide dismutase (SOD) | 第31页 |
| 2.3.2 Peroxidase (GPOD) | 第31-32页 |
| 2.3.3 Ascorbate Peroxidase (APX) | 第32-33页 |
| 2.3.4 Catalase | 第33页 |
| 2.3.5 Malonaldehyde (MDA) | 第33-34页 |
| 2.3.6 Hydrogen peroxide | 第34-36页 |
| CHAPTER 3 | 第36-48页 |
| 3 Changes in the activities of antioxidant enzymes and photosynthesis in leaves of Lycopersicon esculentum Mill after exposure to different temperatures | 第36-48页 |
| Abstract | 第36页 |
| 3.1 Introduction | 第36-38页 |
| 3.2 Materials and Methods | 第38-41页 |
| 3.2.1 Growth conditions and Temperature treatments | 第38-39页 |
| 3.2.2 Gas exchange and Chlorophyll fluorescence Measurement | 第39页 |
| 3.2.3 Activities of antioxidant enzymes and Malonaldehyde (MDA) content | 第39-40页 |
| 3.2.4 Statistical analysis | 第40-41页 |
| 3.3 Results | 第41-46页 |
| 3.3.1 Effects of temperature on gas exchange and chlorophyll fluorescence parameters | 第41-44页 |
| 3.3.2 Effects of temperature on the activities of antioxidant enzymes and MDA content | 第44-46页 |
| 3.4 Discussion | 第46-48页 |
| CHAPTER 4 | 第48-65页 |
| 4 The effects of growth regulators ABA, Cytokinin and BRs on the photosynthesis and activities of antioxidant enzymes in tomato leaves at slightly elevated temperature | 第48-65页 |
| Abstract | 第48-49页 |
| 4.1 Introduction | 第49-51页 |
| 4.2 Materials and Methods | 第51-54页 |
| 4.2.1 Growth conditions and growth regulators treatments | 第51-52页 |
| 4.2.2 Gas exchange and chlorophyll fluorescence measurements | 第52页 |
| 4.2.3 Activities of antioxidant enzymes and MDA contents determination | 第52-53页 |
| 4.2.4 Statistical analysis | 第53-54页 |
| 4.3 Results | 第54-61页 |
| 4.3.1 Effects of growth regulators on gas exchange and chlorophyll fluorescence | 第54-58页 |
| 4.3.2 Effects of growth regulators on the activities of antioxidant enzymes and MDA content | 第58-61页 |
| 4.4 Discussion | 第61-65页 |
| CHAPTER 5 | 第65-82页 |
| 5 Alleviation of high temperature induced inhibition of photosynthesis by Brassinosteroids | 第65-82页 |
| Abstract | 第65页 |
| 5.1 Introduction | 第65-68页 |
| 5.2 Materials and Methods | 第68-71页 |
| 5.2.1 Growth conditions and temperature treatments | 第68页 |
| 5.2.2 Gas exchange and chlorophyll fluorescence measurements | 第68-69页 |
| 5.2.3 Activities of antioxidant enzymes and malonaldehyde (MDA) content | 第69-70页 |
| 5.2.4 Statistical analysis | 第70-71页 |
| 5.3 Results | 第71-78页 |
| 5.3.1 EBR effects on plant growth and gas-exchange parameters | 第71-75页 |
| 5.3.2 EBR effects on chlorophyll fluorescence parameters | 第75页 |
| 5.3.3 EBR effects on the activities of antioxidants enzymes, hydrogen peroxide and MDA contents | 第75-78页 |
| 5.4 Discussion | 第78-82页 |
| CHAPTER 6 | 第82-85页 |
| 6. Conclusions and Recommendations | 第82-85页 |
| 6.1 Conclusions | 第82-83页 |
| 6.2 Recommendations | 第83-85页 |
| 7. REFERENCES | 第85-101页 |
