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A unique non-pathogenic strain of Fusarium oxysporum was isolated from field-collected plants of Agave victoria-reginae Moore. It was then re-introduced into micropropagated plants of the same species under greenhouse conditions. The fungic inoculation induced a 225% increase in the length of roots, 50% in the number of root branches and 50% in the number of stomata on the adaxial surface of leaves...