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Induced resistance in hypersensitive tobacco against tobacco mosaic virus by injection of intercellular fluid from tobacco plants with systemic acquired resistance






Journal of Phytopathology (Berlin) 118(2): 165-170

Induced resistance in hypersensitive tobacco against tobacco mosaic virus by injection of intercellular fluid from tobacco plants with systemic acquired resistance

Acquired resistance in hypersensitive tobacco plants against tobacco mosaic virus (TMV) was induced by components occurring in the intercellular fluid (IV) obtained from virus-infected plants or by plant cell wall components. Induced resistance could be transmitted through seed to the progeny. Lesion size and number were reduced significantly when the progeny was tested by TMV-inoculation. IV was extracted from the upper uninoculated leaves of four times TMV-inoculated Nicotiana tabacum cv. 'Xanthi' nc plants. Injection of IV from induction-inoculated plants (SAR-IV) into leaves of healthy plants followed by TMV-infection reduced lesion size significantly. A concentration of 5 .times. 10-7 g SAR-IV/ml was still active. IV from healthy plants was inactive. The IV's were partly purified by gel filtration on a Sephadex G-50 column. Some fractions were active in inducing resistance as expressed in reduction of lesion size. Fractions of control-IV were inactive. It is still unknown whether the active substances in SAR-IV are in fact cell wall fragments acting as regulatory molecules in disease resistance.

Accession: 001615890

DOI: 10.1111/j.1439-0434.1987.tb00444.x

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