| 摘要 | 第1-9页 |
| Abstract | 第9-11页 |
| Abbreviations | 第11-13页 |
| CHAPTER 1 | 第13-21页 |
| 1. Introduction | 第13-19页 |
| ·Selenium | 第14-15页 |
| ·Molybdenum | 第15页 |
| ·Brassica campestris L. ssp. Pekinensis | 第15-16页 |
| ·Literature review | 第16-19页 |
| ·Pb as a threat to the environment | 第16页 |
| ·Selenium and Molybdenum as potential antagonists | 第16-18页 |
| ·Hyperaccumulator | 第18-19页 |
| 2. Background and objectives of the research | 第19-21页 |
| ·Research main objectives | 第19页 |
| ·Specific Objectives | 第19-20页 |
| ·Research structure pathway | 第20-21页 |
| CHAPTER2 The effects of Se and Mo on the growth of Brassica campestris L. ssp. pekinensis underPb stress | 第21-31页 |
| ·Introduction | 第21-22页 |
| ·Materials and methods | 第22-24页 |
| ·Soil used in this study | 第22页 |
| ·Plant Material and growth condition | 第22-23页 |
| ·Experiment Treatments | 第23页 |
| ·Plant biomass | 第23页 |
| ·Statistical Analysis | 第23-24页 |
| ·Results | 第24-31页 |
| ·Morphology | 第24-25页 |
| ·Biomass | 第25-28页 |
| ·Discussions | 第28-31页 |
| CHAPTER3 Effect of Se and Mo on the content of Pb in Brassica campestris L. ssp. Pekinensis tissuesunder Pb stress | 第31-38页 |
| ·Introduction | 第31页 |
| ·Materials and Methods | 第31-32页 |
| ·Determination of Pb Content in shoots and roots | 第31-32页 |
| ·Pb assay in the soil | 第32页 |
| ·Statistical Analysis | 第32页 |
| ·Results | 第32-35页 |
| ·Pb content in the shoots and roots of Brassica campestris L. ssp. pekinensis | 第32-34页 |
| ·Pb concentration in the soil | 第34-35页 |
| ·Discussion | 第35-38页 |
| ·Pb content in the shoots and roots of Brassica campestris L. ssp. Pekinensis | 第35-37页 |
| ·Pb concentration in the soil | 第37-38页 |
| CHAPTER 4 Antagonistic interaction between Se and Mo under the influence of Pb stress in Brassicacampestris L. ssp. Pekinensis | 第38-49页 |
| ·Introduction | 第38-39页 |
| ·Materials and Methods | 第39-40页 |
| ·Soil | 第39页 |
| ·Assay of Se content in the shoots and roots | 第39-40页 |
| ·Analysis of Mo content in the leafs and roots of | 第40页 |
| ·Assay of Se concentration in the soil after experiment | 第40页 |
| ·Assay of Mo concentration in the soil after experiment | 第40页 |
| ·Statistical Analysis | 第40页 |
| ·Results | 第40-46页 |
| ·Se content in the shoots and roots of Brassica campestris L. ssp. Pekinensis | 第40-42页 |
| ·Mo contents in the shoots and roots of Brassica campestris L. ssp. Pekinensis | 第42-44页 |
| ·Se concentration in the soil after the experiment | 第44-45页 |
| ·Mo concentration in the soil after the experiment | 第45-46页 |
| ·Discussion | 第46-49页 |
| ·Se content in the shoots and roots of Brassica campestris L. ssp. Pekinensis | 第46-47页 |
| ·Mo contents in the shoots and roots of Brassica campestris L. ssp. Pekinensis | 第47页 |
| ·Se concentration in the soil after the experiment | 第47-48页 |
| ·Mo concentration in the soil after the experiment | 第48-49页 |
| CHAPTER 5 Effect of Se and Mo on the minerals elements uptake by Brassica campestris L. ssp.Pekinensis under Pb stress | 第49-54页 |
| ·Introduction | 第49页 |
| ·Materials and methods | 第49-50页 |
| ·Determination micro-elements in shoots and roots | 第49-50页 |
| ·Statistical Analysis | 第50页 |
| ·Results | 第50-52页 |
| ·Macro and micro-elements content in shoots and roots of Brassica campestris L. ssp. Pekinensis under Pb stress | 第50-52页 |
| ·Discussion | 第52-54页 |
| CHAPTER6 Reaction of antioxidant enzymes activities on Se and Mo in attempt to alleviate Pb toxicity | 第54-64页 |
| ·Introduction | 第54-55页 |
| ·Materials and Methods | 第55-56页 |
| ·Soil utilized in this study | 第55页 |
| ·Plant materials | 第55页 |
| ·Analysis of antioxidant enzymes activities:SOD, CAT and POD | 第55-56页 |
| ·Analysis of antioxidant non-enzymes activities:AsA and GSH | 第56页 |
| ·Statistical Analysis | 第56页 |
| ·Results | 第56-59页 |
| ·Analysis of antioxidant enzymes activities (SOD EC 1.15.1.1) in shoots of Brassica campestris L. ssp. pekinensis | 第57页 |
| ·CAT EC 1.11.1.6 enzymes activity in the shoots of Brassica campestris L. ssp.pekinensis | 第57-58页 |
| ·POD EC 1.11.1.7 Enzymes activity in the shoots of Brassica campestris L. ssp.pekinensis | 第58-59页 |
| ·Non-enzymes antioxidants contents in the shoots of Brassica campestris L. ssp.pekinensis | 第59-61页 |
| ·AsA contents | 第59-60页 |
| ·GSH contents | 第60-61页 |
| ·Discussion | 第61-64页 |
| CHAPTER 7 | 第64-66页 |
| ·conclusion | 第64-66页 |
| References | 第66-71页 |
| Acknowledgements | 第71-72页 |
