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THE PLANT CELL, Vol 9, Issue 2 135-144, Copyright © 1997 by American Society of Plant Biologists
A Single Gene Encodes a Selective Toxin Causal to the Development of Tan Spot of Wheat
L. M. Ciuffetti, R. P. Tuori and J. M. Gaventa
Department of Botany and Plant Pathology, Cordley Hall, Oregon State University, Corvallis, Oregon 97331
The identification and characterization of pathogenicity factors are
essential to an understanding of the molecular events that regulate the
interaction of plant-pathogenic microbes with their hosts. We have isolated
the gene that encodes a host-selective toxic protein produced by the fungus
Pyrenophora tritici-repentis and confirmed that this gene functions in the
plant as the primary determinant of pathogenicity in the Pyrenophora-wheat
interaction. These results demonstrate that a single gene encodes the
production of a host-selective toxin and that transformation of this gene
into a non-toxin-producing isolate of P. tritici-repentis leads to both
toxin production and pathogenicity.
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