声明
Table of Contents
ABSTRACT
摘要
List of Abbreviations
Chapter 1 Literature Review
1．1 Cotton production in China
1．1．1 Challenges in cotton production in China
1．1．2 Possible solutions
1．2 Potassium
1．2．1 Potassium scenario in the world
1．2．2 Potassium significance for plants and cotton production
1．2．3 Potassium-nitrogen ratio in relation to plant photosynthesis
1．2．4 Potassium-nitrogen ratio in relation to carbohydrate metabolism
1．2．5 Potassium-nitrogen ratio in relation to plant stress mitigation
1．3 Significance and perspectives of the study
1．3．1 Significance
1．3．2 Objectives
1．3．3 The road map
Chapter 2 Effects of potassium-nitrogen ratio on photosynthesis in cotton main stem leaves
2．1 Introduction
2．2 Materials and Methods
2．2．1 Climatic conditions
2．2．3 Experimental design，treatments and crop management
2．2．4 Photosynthesis measurements
2．2．5 Chlorophyll parameters
2．2．6 Cotton yield attributes
2．2．7 Statistical analysis
2．3．1 Cotton yield attributes
2．3．2 Photosynthetic parameters
2．3．3 Chlorophyll parameters
2．3．4 Relationship of photosynthetic attributes，chlorophyll parameters cotton yield
2．4 Discussion
2．5 Conclusion
Chapter 3 Effects of potassium to nitrogen ratio on photosynthetic attributes and sucrose metabolism in cotton subtenamg leaves
3．1 Introduction
3．2 Materials and Methods
3．2．1 Climatic conditions
3．2．2 Experimental area，soil characteristics and cultivar
3．2．3 Experimental design，treatments，and crop management
3．2．4 Leaf growth attributes
3．2．5 Photosynthetic attributes
3．2．6 Chlorophyll fluorescence
3．2．7 Determination of chlorophyll and ATP contents，and enzymatic activity
3．2．8 Leaf carbohydrate analysis
3．2．9 Statistical analysis
3．3．1 Leaf growth attributes
3．3．2 Photosynthetic attributes
3．3．3 Chlorophyll fluorescence
3．3．4 Chlorophyll contents
3．3．5 Total Rubisco activity and ATP contents
3．3．6 Changes in carbohydrate contents
3．3．7 Changes in sucrose metabolizing enzymes activity and their relationship with sucrose contents in subtending leaves
3．3．8 Relationship among Pn，sucrose metabolizing enzymes，sucrose content in subtending leaf and cotton yield
3．3．9 Correlation coefficients between the source and sink indices
3．4 Discussion
3．5 Conclusion
4．1 Discussion
4．1．1 Potassium-nitrogen ratio in relation to photosynthesis
4．1．2 Potassium-nitrogen ratio in relation to carbohydrate metabolism
4．1．3 Photosynthesis in relation to cotton yield formation
4．1．4 Carbohydrate metabolism in relation to cotton yield formation
4．1．5 Comparison between photosynthetic attributes of main stem leaf at the 6th node from the top and its corresponding first fruiting branch leaf at the same node
4．1．6 A possible mutual action of photosynthesis and carbohydrate metabolism on cotton yield formation
4．2 Conclusion
4．3 Innovations
4．4 Perspective for further work
REFERENCES
SUPPLEMENTARY
ACKNOWLEDGMENTS
