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Posttranscriptional Gene Silencing Does Not Play a Significant Role in Potato virus X Coat Protein-Mediated Resistance

November 2006 , Volume 96 , Number  11
Pages  1,175 - 1,178

A. A. Bazzini , H. E. Hopp , R. N. Beachy , and S. Asurmendi

First, third, and fourth authors: Donald Danforth Plant Science Center, 975 North Warson Road, St. Louis, MO 6313; and first, second, and fourth authors: Instituto de Biotecnología, INTA Castelar, Las Cabañas y Los Reseros, B1712WAA Buenos Aires, Argentina

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Accepted for publication 16 June 2006.

The expression of a gene that encodes coat protein (CP) of Potato virus X (PVX) in transgenic tobacco plants confers a high level of CP-mediated rresistance (CP-MR) against PVX infection. To determine if posttranscriptional gene silencing (PTGS) plays a role in resistance, transgenic plants expressing PVX CP were challenged against PVX under conditions in which PTGS was suppressed by low temperatures or using viruses carrying PTGS suppressors. The data demonstrate that PTGS does not play a significant role in PVX CP-MR.

The American Phytopathological Society, 2006