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Dr. Mudawi Elobeid

Physiology of Auxin in Response to Environmental Stress and Heavy Metal Pollution

• Georg-August Universität Göttingen • Buch (Gebunden) • Dissertation • Englisch • Softcover (Paperback) • 21,0 x 14,8 cm (DIN A5) • XIII / 181 Seiten • Neu (eingschweißt in Folie)
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  • 9783941274129
  • 978-3-941274-12-9
Phyto-hormones play critical roles in the coordination of plant growth and development.... mehr

Phyto-hormones play critical roles in the coordination of plant growth and development. Generally, plant hormones promote, inhibit, or qualitatively modify plant growth and development. This complex process requires signal transduction, specific information pathways, translating intra- or extra-cellular signals into specific cellular responses within a cell. Auxins represent an important class of plant hormones. Plant growth is regulated by auxin via the regulation of various genes responsible for different metabolic processes in the plant. The impact of toxic heavy metals like cadmium and transition metals like copper and manganese in the soil, on plant defence reactions and their implications for plant growth have been extensively investigated. However, how auxin is involved in mediating environmental stresses and heavy metal stress is still not understood. This study was designed to address the following questions in poplar: Are there changes in the expression pattern of GH3::GUS promoter-reporter constructs in relation to seasonal changes under natural field conditions? What is the effect of cadmium stress on the auxin physiology? What is the effect of excessive manganese on auxin physiology? What are the copper requirements for poplar growth? Poplar was chosen for this study as it is a model forest tree for molecular studies. Grey poplar, Populus x canescens (a hydrid of P. tremula and P. alba) and three transgenic lines transformed with a GH3::GUS construct responsive to auxin, were used. The plants were grown in compost soil outdoors as well as in hydroponic media under greenhouse conditions to investigate auxin pattern in the tissues…

Titel: Physiology of Auxin in Response to Environmental Stress and Heavy Metal Pollution
Autor: Dr. Mudawi Elobeid
Hochschule: Georg-August Universität Göttingen
Erschienen: 1. Aufl. 06.02.2009
Fachbereich: Agrar- & Forstwissenschaft
Produkttyp: Buch (Gebunden)
Produktart: Dissertation
Sprache: Englisch
Einband: Softcover (Paperback)
Maße: 21,0 x 14,8 cm (DIN A5)
Umfang: XIII / 181 Seiten
Zustand: Neu (eingschweißt in Folie)
Keywords: auxin, heavy metal, poplar, seasonal change
Details "Physiology of Auxin in Response to Environmental Stress and Heavy Metal Pollution"
Titel: Physiology of Auxin in Response to Environmental Stress and Heavy Metal Pollution
Autor: Dr. Mudawi Elobeid
Hochschule: Georg-August Universität Göttingen
Erschienen: 1. Aufl. 06.02.2009
Fachbereich: Agrar- & Forstwissenschaft
Produkttyp: Buch (Gebunden)
Produktart: Dissertation
Sprache: Englisch
Einband: Softcover (Paperback)
Maße: 21,0 x 14,8 cm (DIN A5)
Umfang: XIII / 181 Seiten
Zustand: Neu (eingschweißt in Folie)
Keywords: auxin, heavy metal, poplar, seasonal change
List of contents Abstract (English) Abstract (German) Abbreviations List of companies... mehr

List of contents
Abstract (English)
Abstract (German)
Abbreviations
List of companies

Chapter 1
1. General Introduction
1.1 Environmental pollution by heavy metals
1.2 Cadmium
1.3 Copper and manganese
1.4 Auxin
1.4.1 Functions of auxin
1.4.2 Regulation of auxin
1.4.3 Auxin transport
1.4.4 Seasonality of auxin
1.5 Aims of the study
1.6 References

Chapter 2
2. Seasonal Changes in Auxin Physiology in Grey Poplar (Populus x canescens) as Related to Growth and Dormancy
2.1 Introduction
2.1.1 Auxin and plant growth
2.1.2 Seasonality of auxin
2.1.3 Growth regulation in response to photoperiod and temperature
2.2 Materials and methods
2.2.1 Preparation of plant materials and growth conditions
2.2.2 Measurements
2.2.2.1 Growth measurements
2.2.2.2 Gas exchange measurements
2.2.2.3 Harvest
2.2.2.4 GUS activity analysis
2.2.2.4.1 Leaf GUS staining
2.2.2.4.2 GUS staining of the stem
2.2.2.4.3 Root GUS staining
2.2.3 GUS staining procedure
2.2.4 Statistical analysis
2.3 Results
2.3.1 Growth performance of wildtype and the transgenic lines
2.3.2 Biomass
2.3.3 Root-to.shoot ratio and the final measurements of growth parameters
2.3.4 Gas exchange measurements
2.3.5 GUS activity analysis
2.3.5.1 Leaf GUS staining
2.3.5.2 Root GUS staining
2.3.5.3 Stem GUS staining
2.4 Discussion
2.5 References

Chapter 3
3. The Effect of Cadmium (Cd) Stress on the Growth and Auxin Physiology of Grey Poplar (Populus x canescens) Transformed with a GH3::GUS Construct
3.1 Introduction
3.1.1 Cadmium toxicity
3.1.2 Effect of Cd on elongation growth
3.1.3 Cadmium uptake, distribution and accumulation
3.1.4 Effect of Cd on chlorophyll fluorescence
3.1.5 Effect of Cd on photosynthesis
3.1.6 Effect of Cd on total soluble protein content and the activity of defence enzymes
3.1.7 Effect of Cd on lignification
3.1.8 Effect of Cd on auxin
3.1.9 Objectives of the study
3.2 Materials and methods
3.2.1 Preparation of plant materials and growth conditions
3.2.2 Cadmium treatment
3.2.3 Measurements
3.2.3.1 Growth performance
3.2.3.2 Chlorophyll fluorescence
3.2.3.3 Gas exchange measurements
3.2.3.4 Relative electrolyte conductivity
3.2.3.5 Harvest
3.2.3.6 Determination of the total plant leaf area
3.2.3.7 Quantification of lignin
3.2.3.8 Biochemical analysis
3.2.3.9 GUS activity analysis
3.2.3.9.1 Leaf GUS staining
3.2.3.9.2 GUS staining of the stem
3.2.3.9.3 Root GUS staining
3.2.3.10 The infiltration study with cadmium
3.2.3.11 Cadmium analysis
3.2.5 Statistical analysis
3.3 Results
3.3.1 Growth performance
3.3.2 Biomass and leaf area
3.3.3 Dry mass: fresh mass ratio
3.3.4 Chlorophyll fluorescence
3.3.5 Gas exchange measurements
3.3.6 Relative electrolyte conductivity
3.3.7 Biochemical analysis
3.3.8 Lignin analysis
3.3.9 Cadmium analysis
3.3.10 GUS activity analysis
3.3.10.1 Description of representative GUS pictures
3.3.10.2 GUS activity evaluation
3.3.11 The infiltration study with cadmium
3.4 Discussion
3.5 References

Chapter 4
4. The Effect of Excessive Manganese (Mn) on Growth and Auxin Physiology of Grey Poplar (Populus x canescens) Transformed with a GH3::GUS Construct
4.1 Introduction
4.2 Materials and methods
4.2.1 Preparation of plant materials and growth conditions
4.2.2 Mn treatment
4.2.3 Measurements
4.2.3.1 Growth performance
4.2.3.2 Chlorophyll fluorescence
4.2.3.3 Harvest
4.2.3.4 Biochemical analysis
4.2.3.5 GUS activity analysis
4.2.3.5.1 GUS staining of the stem
4.2.3.5.2 Root GUS staining
4.2.4 Statistical analysis
4.3 Results
4.3.1 Growth performance
4.3.2 Chlorophyll fluorescence
4.3.3 Biomass
4.3.4 Biochemical analysis
4.3.5 GUS activity analysis
4.3.5.1 Description of the GUS pictures
4.3.5.2 GUS activity evaluation
4.4 Discussion
4.5 References

Chapter 5
5. Response of Grey Poplar (Populus x canescens) to Copper (Cu) Stress
5.1 Introduction
5.2 Materials and methods
5.2.1 Preparation of plant materials and growth conditions
5.2.2 Copper treatment
5.2.3 Measurements
5.2.3.1 Growth performance
5.2.3.2 Chlorophyll fluorescence
5.2.3.3 Harvest
5.2.3.4 Biochemical analysis
5.2.4 Statistical analysis
5.3 Results
5.3.1 Growth performance
5.3.2 Chlorophyll fluorescence
5.3.3 Biomass
5.3.4 Biochemical analysis
5.4 Discussion
5.5 References

6. Appendices
2.1 The nutrient composition of the Long Ashton nutrient solution
2.2.1 The planting design of the field experiment (Box 2)
2.2.2 The planting design of the field experiment (Box 4)
2.3.1 Air temperature during the experimental period of the field experiment
2.3.2 Day lengths (Photoperiod) during the experimental period of the field experiment
3.1 The preparation of the rooting growth medium for poplar growth
3.2 Composition of the sterile growth medium
3.3 Preparation of the stock culture medium
3.4 The data of the nutrient elements, which have been measured with cadmium

7. Acknowledgement

8. Curriculum Vitae


9. Oral presentations

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