I hereby declare that this thesis is the result of my own work. It has not been submitted either in the same or different form, to this or any other University for a degree. Signature: ii ACKNOWLEDGEMENTS I would like to take this opportunity to thank my supervisor, Dr. Mark Tester for his expert guidance and support throughout this study. His open door policy enabled advice to be sought at any time. My sincere gratitude is also extended to Dr. Romola Davenport, for her regular advice and help in diverse ways. I would also like to acknowledge the help of John Banfield with the technical aspects of this study. Thank you to all members of the Stress Physiology laboratory past and present, the plant transport super group, and the Department of Plant Sciences. Thanks also go to Tracey Prime of the Department of Biochemistry, University of Cambridge, for her helpful ideas for establishing hydroponic culture
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