The Effects of Aspirin and Polyacrylic Acid on the Multiplication and Spread of TMV in Different Cultivars of Tobacco with and without the N-gene

Aspirin treatment of leaves of Nicotiana tabacum cv. Samsun at 20°C induced PR-proteins and reduced the amount of tobacco mosaic virus (TMV) accumulated 7 days after inoculation. However, at 32°C both the amount of PR-proteins induced and the reduction of TMV accumulated were less. Polyacrylic acid did not induce PR-proteins, and caused little or no reduction in the amount of TMV accumulated at 20°C. In cv. Samsun NN at 32°C. aspirin induced the PR-proteins and reduced the spread of TMV to surrounding tissue as treasured by the size of lesions produced on subsequent transfer to 20°C. Polyacrylic acid did not induce PR-proteins in Samsun NN and had no effect on the spread of TMV. In cv. Xanthi-ne, at 32°C aspirin and polyacrylic acid induced PR-proteins and reduced the spread of TMV. At 35°C, polyacrylic acid induced little or no PR-proteins and did not affect the spread of TMV.