Journal of Phytopathology - Phytopathologische Zeitschrift (1995) 143, 705-711

J.J.H.M. Allefs, W. van Dooueweert, E.R. de Jong, W. Prummel and J. Hoogendoorn (1995)
Factors affecting potato soft-rot resistance to pectolytic Erwinia species in a tuber-slice assay
Journal of Phytopathology - Phytopathologische Zeitschrift 143 (11-12), 705-711
Abstract: Potato-tuber slices and small tubers of 12 cultivars were inoculated with isolates of Erwinia carotovora subsp. atroseptica (Eca), E. c. subsp. carotovora (Ecc) and E. chrysanthemi (Ech). Cultivar resistance was expressed as the mean diameter of the rotted-tissue area. Grouping of the cultivars into classes of relatively high, intermediate or low resistance, was different after incubation in air in comparison to incubation under anaerobic conditions, and depended on the (sub-)species of bacteria used. When compared to the effect of inoculation with different (sub-)species, grouping of the cultivars was less affected by isolates within (sub-)species. Cultivar grouping was hardly affected by site of inoculation, being either in the medullary tissue or in the cortex. In general, the results of experiments with either field-grown seed tubers or glasshouse-grown small tubers from 2 years were reproducible, except when tuber tissue was inoculated with Ech and incubated, aerobically, in which case cultivars only showed relatively small differences for resistance. Correlation coefficients between the results from slice and small-tuber screenings were 0.71 and 0.64 for Eca and Ecc, respectively. This implies, some potential for applying the method in the early stages of potato-breeding programmes.
The results of this study show that soft-rot resistance of clones to different pectolytic Erwinia spp. can be determined efficiently and reproducibly if the oxygen concentration during incubation is standardized.
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Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pectobacterium carotovorum	Potato (Solanum tuberosum)
	Pectobacterium atrosepticum	Potato (Solanum tuberosum)
	Dickeya (genus)	Potato (Solanum tuberosum)