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Physiology and Biochemistry

Peroxidase Activity in Tobacco Plants with Polyanion-Induced Interference to Tobacco Mosaic Virus. Adina Stein, Virus Laboratory, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel; G. Loebenstein, Virus Laboratory, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. Phytopathology 66:1192-1194. Accepted for publication 2 April 1976. Copyright © 1976 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-66-1192.

Peroxidase activity (PA) in tobacco cultivar Samsun NN leaves increased after injection of ethylene-maleic anhydride (EMA) 31, vinyl methyl ether/maleic anhydride (VME/MA), or VME/MA 0.5 methylester (VME/MAes), but not after that of polyacrylic acid (PAA). No correlation was established between increase in PA and induction of interference to TMV: interference induced by EMA 31 became evident before increases in PA; PA increased in plants treated with VME/MAes, a polyanion that does not induce resistance; actinomycin D inhibited the development of EMA 31-induced interference, but did not affect the increase in PA; and in a systemic host, PA increased after application of EMA 31 without reducing virus titre. Therefore, in the polyanion system at least, induced interference is not caused by enhanced PA.