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J Gen Virol 23 (1974), 1-9; DOI 10.1099/0022-1317-23-1-1
© 1974 Society for General Microbiology
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Virus Resistance Induced in Plants by Polyacrylic Acid

S. Gianinazzi* and B. Kassanis

Department of Plant Pathology, Rothamsted Experimental Station, Harpenden, Hertfordshire, England

Polyacrylic acid (PA) injected into tobacco cv. Xanthi-nc induced complete resistance to infection with TMV or tobacco necrosis virus but only partial resistance to potato virus X. The effect was maximal when the injection was made 2 to 3 days before inoculation. The lesion size was limited when the injection was made after inoculation. Using PA of 3500, 27000, 76000, 230000 and 1 x 106 mol. wt. the resistance decreased with increasing size of the polymer. In plants younger than 7 weeks, only the smallest polymer was active and evidence suggested that cell permeability to the larger polymers might increase with age of plant. The PA-induced resistance disappeared when plants were kept at 32 °C, but the effect of temperature was reversible. Polyacrylamide failed to induce resistance suggesting that the polyanionic structure of the acid polymers is responsible for the phenomenon.

Disc-electrophoresis in 10% polyacrylamide gels showed that three additional soluble proteins appeared in PA-injected leaves, but only in conditions in which resistance to infection was induced. These new proteins co-electrophoresed with three out of four proteins produced in TMV-infected leaves of cv. Xanthi plants that also are resistant to infection and may be the cause of resistance.

* Present address: Station de Phytopathologie, I.N.R.A., 21034 Dijon Cedex, France.

Received 28 August 1973; accepted 4 October 1973.




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