Abstract
Summary Partially purified leaf extract from carnation plants is able to induce resistance to TMV in the treated as well as in the distantly located leaf tissues in both systemically and hypersensibly reacting host-plants of TMV. On the four studied TMV-host combinations any striking host specificity of the induction capability was not observed. In all cases the inducer application before virus inoculation led to higher effects than the treatment after infection. The persistance of the effect, even by treatments up to 4 d a.i., is very strong. The best effect was found by the shortest time intervalls between treatment and inoculation. In experiments with mixed inocula (virus plus carnation leaf extract) it was shown that the antiviral activity is a remarkable temperature resistant (up to 70°C without any and between 70 and 100°C with a gradual loss of activity), not being influenced by changes of pH between 2 and 10 and being logarithmically related to dilutions of the leaf extract.
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