الفهرس 
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Abstract
ACKNOWLEDGEMENT
In the beginning , I would say thanks to my supervisor Prof.
Dr. Ahmed Abd-El-Moneim El-Shewy, Prof. of Plant Physiology, Agric.
Botany Dept., Faculty of Agric., Fayoum University, to guide me well
throughout the research work from title’s selection to finding the
results. His immense knowledge, motivation and patience have given me
more power and spirit to excel in the research writing. Conducting the
academic study regarding such a difficult topic couldn’t be as simple as
he made this for me. He is my mentor and a better advisor for my
doctorate study beyond the imagination. Apart from my Supervisor, I
won’t forget to express my deepest gratitude to Prof. Dr. Mohamed
Ahmed Seif El-Yazal, Prof. of Plant Physiology, Agric. Botany Dept.,
Faculty of Agriculture, Fayoum University, for giving the
encouragement and sharing insightful suggestions. He has played a
major role in polishing my research writing skills. He really means a lot
to me. His endless guidance is hard to forget throughout my life. I am
also pleased to say thank you to Dr Mostafa Mohamed Rady, Prof. of
Plant Physiology and Head of Agric. Botany Dept., Faculty of Agric.,
Fayoum University who made my access simpler to the research
facilities and laboratory and gave an opportunity to become part of his
team as an intern. It wouldn’t have been possible to conduct this
research without his precious support