A total 15 different soil samples were collected from various
soils in Canada (collected on the campus of the University of Waterloo
and from the Kitchener, Ontario), Lyon, France (kindly provided
by Dr. , Haifa, Israel (kindly provided by Dr.
Shimon Gepstein), Evora, Portugal (kindly provided by Dr. Solange
Oliveira), and the Blacksburg Virginia, United States of America
Surface sterilized tomato
seeds