| ABSTRACT | 第8-10页 |
| 摘要 | 第11-13页 |
| CHAPTER 1 REVIEW OF LITERATURE | 第13-33页 |
| 1.1 INTRODUCTION | 第13-15页 |
| 1.2 EFFECTS OF DROUGHT STRESS ON PLANTS AND STRESS RELIEF BY POTASSIUMAPPLICATION | 第15-23页 |
| 1.2.1 Leaf water relations and osmotic adjustment | 第15-16页 |
| 1.2.2 Photosynthesis | 第16-18页 |
| 1.2.3 Oxidative damage | 第18-19页 |
| 1.2.4 Antioxidant defense system | 第19-20页 |
| 1.2.5 Carbohydrate metabolism and dry matter partitioning | 第20-21页 |
| 1.2.6 Nitrogen metabolism | 第21-23页 |
| 1.3 FUTURE PERSPECTIVES | 第23页 |
| 1.4 OBJECTIVES | 第23-24页 |
| 1.5 TECHNICAL ROUTE MAP OF THE EXPERIMENT | 第24-25页 |
| REFERENCES | 第25-33页 |
| CHAPTER 2 POTASSIUM IMPROVES ACCLIMATION TO AND RECOVERYFROM DROUGHT STRESS IN FUNCTIONAL LEAF PHOTO-PHYSIOLOGICALACTIVITIES OF COTTON | 第33-59页 |
| 2.1 INTRODUCTION | 第33-36页 |
| 2.2 MATERIALS AND METHODS | 第36-39页 |
| 2.2.1 Plant materials and growth conditions | 第36页 |
| 2.2.2 Experimental design | 第36-37页 |
| 2.2.3 Sampling and processing | 第37页 |
| 2.2.4 Leaf water potential measurement | 第37页 |
| 2.2.5 Gas exchange parameters and chlorophyll fluorescence | 第37-38页 |
| 2.2.6 MDA concentration and antioxidant enzymes activities | 第38页 |
| 2.2.7 Leaf Proline and K contents assay | 第38-39页 |
| 2.3 STATISTICAL ANALYSIS | 第39页 |
| 2.4 RESULTS | 第39-49页 |
| 2.4.1 Leaf K content | 第39-40页 |
| 2.4.2 Changes in leaf water potential | 第40-41页 |
| 2.4.3 Changes in leaf gas exchange parameters | 第41-42页 |
| 2.4.4 Chlorophyll fluorescence parameters | 第42-44页 |
| 2.4.5 Lipid peroxidation, proline content and enzymatic antioxidants activities | 第44-46页 |
| 2.4.6 Fractional recovery of Pn and Fv/Fm in cotton cultivars after rewatering inrelation to Ψ_w and varying rates of K fertilizer | 第46-49页 |
| 2.5 DISCUSSION | 第49-52页 |
| 2.6 CONCLUSIONS | 第52-54页 |
| REFERENCE | 第54-59页 |
| CHAPTER 3 POTASSIUM FERTILIZER IMPROVES DROUGHT STRESSALLEVIATION POTENTIAL IN COTTON BY ENHANCING PHOTOSYNTHESISAND CARBOHYDRATE METABOLISM | 第59-85页 |
| 3.1 INTRODUCTION | 第59-62页 |
| 3.2 MATERIALS AND METHODS | 第62-64页 |
| 3.2.1 Plant materials and growth conditions | 第62页 |
| 3.2.2 Experimental design and treatments | 第62页 |
| 3.2.3 Plant sampling and measurements | 第62页 |
| 3.2.4 Gas exchange parameters | 第62页 |
| 3.2.5 Carbohydrate contents in leaves | 第62-63页 |
| 3.2.6 Enzyme extraction and assay | 第63-64页 |
| 3.2.7 Dry matter partitioning | 第64页 |
| 3.3 DATA ANALYSIS | 第64页 |
| 3.4 RESULTS | 第64-74页 |
| 3.4.1 Effect of K application on photo-assimilates partitioning in response to drought | 第64-68页 |
| 3.4.2 Gas exchange parameters | 第68页 |
| 3.4.3 Effect of K on functional leaves carbohydrate content in response to droughtstress | 第68页 |
| 3.4.4 Effect of K on carbohydrate metabolism enzyme activities in response todrought stress | 第68-74页 |
| 3.5 DISCUSSION | 第74-78页 |
| 3.6 CONCLUSIONS | 第78-80页 |
| REFERENCES | 第80-85页 |
| CHAPTER 4 POTASSIUM REGULATES NITROGEN METABOLISM ANDOSMOTIC ADJUSTMENT IN COTTON (GOSSYPIUMHIRSUTUM L.)FUNCTIONAL LEAF UNDER DROUGHT STRESS | 第85-107页 |
| 4.1 INTRODUCTION | 第85-87页 |
| 4.2 MATERIALS AND METHODS | 第87-91页 |
| 4.2.1 Plant material and Experimental design | 第87-88页 |
| 4.2.2 Sampling and processing | 第88页 |
| 4.2.3 Leaf relative water content and osmotic adjustment | 第88-89页 |
| 4.2.4 Chlorophyll content | 第89页 |
| 4.2.5 Soluble sugars, amino acid and proline | 第89页 |
| 4.2.6 N metabolizing enzymes and soluble protein | 第89-91页 |
| 4.2.7 Leaf nitrate and K contents | 第91页 |
| 4.3 STATISTICAL ANALYSIS | 第91页 |
| 4.4 RESULTS | 第91-97页 |
| 4.4.1 Changes in leaf water relations and osmotic adjustment | 第91页 |
| 4.4.2 Leaf nitrate and K contents | 第91-92页 |
| 4.4.3 Changes in leaf chlorophyll and sugar contents | 第92-94页 |
| 4.4.4 Changes in soluble protein, free amino acids and proline contents | 第94-96页 |
| 4.4.5 Changes in N metabolizing enzymes | 第96-97页 |
| 4.5 DISCUSSION | 第97-101页 |
| 4.6 CONCLUSIONS | 第101-102页 |
| REFERENCES | 第102-107页 |
| CHAPTER 5 DISCUSSION AND CONCLUSIONS | 第107-127页 |
| 5.1 POTASSIUM IMPROVES ACCLIMATION TO AND RECOVERY FROM DROUGHT STRESS OFPHOTO-PHYSIOLOGICAL ACTIVITIES IN COTTON LEAVES | 第107-111页 |
| 5.2 POTASSIUM IMPROVED CARBON ASSIMILATION AND METABOLISM IN DROUGHTSTRESSED COTTON PLANTS | 第111-115页 |
| 5.3 POTASSIUM REGULATED NITROGEN METABOLISM AND OSMOTIC ADJUSTMENT OFDROUGHT STRESSED COTTON LEAVES | 第115-119页 |
| 5.4 CONCLUSIONS | 第119-120页 |
| New insights | 第120-121页 |
| Reference | 第121-127页 |
| PUBLICATIONS | 第127-129页 |
| ACKNOWLEDGEMENTS | 第129页 |
