Necrotic Lesions as Unusual Symptoms of Ring Rot in the Potato Leaves

Necrotic Lesions as Unusual Symptoms of Ring Rot in the Potato Leaves Test-tube plants and suspension cell cultures of two cultivars of the potato (Solanum tuberosum L.) differing in their resistance to ring rot caused by Clavibacter michiganensis subsp. sepedonicus and six strains of this bacterium were used to test the relationship between the virulence, the leaf ability to adsorb bacteria, and the symptoms of the disease. In addition to chlorosis and drying, heavy inoculation with virulent strains caused unusual symptoms, such as leaf necrotic lesions. In the resistant cultivar, the necrotic lesions were predominantly local, whereas in the susceptible cultivar, they expanded. Unlike the susceptible cultivar, suspension cells of the resistant cultivar weakly adhered bacteria of the tested strains. Bacteria entered the plants through the leaf stomata. The sorption and penetration were much more pronounced in the susceptible cultivar. It was concluded that strain virulence varies depending on the conditions of inoculation, and uncharacteristic symptoms (necrotic lesions) arise. The local necrotic lesions are considered a hypersensitive response, and exopolysaccharides of the pathogen as the factors of virulence. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Necrotic Lesions as Unusual Symptoms of Ring Rot in the Potato Leaves

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1020205422029
Publisher site
See Article on Publisher Site

Abstract

Test-tube plants and suspension cell cultures of two cultivars of the potato (Solanum tuberosum L.) differing in their resistance to ring rot caused by Clavibacter michiganensis subsp. sepedonicus and six strains of this bacterium were used to test the relationship between the virulence, the leaf ability to adsorb bacteria, and the symptoms of the disease. In addition to chlorosis and drying, heavy inoculation with virulent strains caused unusual symptoms, such as leaf necrotic lesions. In the resistant cultivar, the necrotic lesions were predominantly local, whereas in the susceptible cultivar, they expanded. Unlike the susceptible cultivar, suspension cells of the resistant cultivar weakly adhered bacteria of the tested strains. Bacteria entered the plants through the leaf stomata. The sorption and penetration were much more pronounced in the susceptible cultivar. It was concluded that strain virulence varies depending on the conditions of inoculation, and uncharacteristic symptoms (necrotic lesions) arise. The local necrotic lesions are considered a hypersensitive response, and exopolysaccharides of the pathogen as the factors of virulence.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 13, 2004

References

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