1- Prof. Dr. Faridah Qamaruz Zaman, Department of Biology, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.

E-mail: faridahqz@gmail.com, fqz@putra.upm.edu.my

2– PD Dr. Habil. N. Gruda, Institute of Horticultural Science, Humboldt University of Berlin, Germany.

E-mail: nazim.gruda@rz.hu-berlin.de or ngruda@web.de

3- Prof. Dr. Abu-Bakr Ali Abu-Goukh, Department of Horticulture, University of Khartoum, Sudan.

E-mail: aabugoukh@yahoo.com

4- Prof. Dr. Mustafa M.A. El-Balla, Department of Horticulture, University of Khartoum, Sudan.

E-mail: melballa@yahoo.com