Growth inhibition of virus infected plants: Alterations of peroxidase enzymes in compatible and incompatible host-parasite relations.

Gáborjányi, Richárd and Sági, F. and Balázs, Ervin (1973) Growth inhibition of virus infected plants: Alterations of peroxidase enzymes in compatible and incompatible host-parasite relations. ACTA PHYTOPATHOLOGICA ACADEMIAE SCIENTIARUM HUNGARICAE, 8 (1-2). pp. 81-90. ISSN 0001-6780

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Abstract

The rate of growth inhibition of inoculated tobacco cultivars, Nicotiana tabacum L. cv. Samsun and cv. Xanthi-nc was measured one month after systemic infection with tobacco mosaic virus (TMV), U₁ strain and cucumber mosaic virus (CMV) white strain, respectively. A positive correlation was determined between the virus-induced host stunting and the enhanced activity of peroxidase enzymes of the host stem. The systemic infection did not induce synthesis of new peroxidase isozymes. The growth inhibition of the TMV-infected hypersensitive cultivar (Xanthi-nc) was not remarkable. Similarly, no significant change was experienced in this case in the peroxidase activities. except the soluble fraction of the inoculated leaves. New peroxidase isozymes appeared in the soluble and cell-wall bound fraction of the inoculated leaves, but there was no change in the isozyme spectra of the stem fractions. Permanent effect of the local virus infection on the peroxidase activity was detected only in the soluble fraction of the young, non infected leaves, which may be in relation to the systemic acquired resistance. No change of activities was registered in the peroxidase fractions of the stem, according to the nearly normal growth of the host. The dwarfing effect of systemic virus infection was reversed by treatment with gibberellic acid. Since gibberellin treatment may reduce indolaecetic acid oxidase activity in the plant cell-wall fraction one can suppose that the virus-induced dwarfing effect could be reversed by this way.

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