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publication 20 Dec. 2000. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact. Horticulturist. To whom requests for reprints should be addressed. E-mail address: pgqoss@ars-grin.gov Lead Plant Pathologist, retired. Biologist. Role of Plant Tissue Cultures in International Exchange and Quarantine of Germplasm in the United States and Canada