The invention relates to isolated DNA sequences encoding MF3 polypeptides
that induce multiple resistance in plants toward a variety of viral and
microbial infections and against pests and a method of obtaining
transgenic plants expressing MF3 polypeptides. The invention also relates
to a method of isolating and purifying an MF3 polypeptide from bacterial
cells expressing the polypeptide and its use as a plant protectant with
or without carrier agent.