Abstract
A method is described in which swede seedlings inoculated with standardized concentrations of resting spores of specific populations of Plasmodiophora brassicae can be evaluated for resistance in different environments. Similar ranking for resistance of four swede cultivars inoculated with one pathogen population was obtained from seedling tests in a glasshouse, from young plants in a polythene tunnel, and from mature plants in field trials. Differential resistance of the four cultivars to two pathogen populations evident in glasshouse seedling tests was more clearly demonstrated in the field where there was a highly significant cuitivar × pathogen population interaction (p<0 001) for both root fresh weight and mean disease category. The inclusion of uninoculated control plants in field trials enabled a direct comparison of yield with that from inoculated plants. Cultivars were defined as resistant in terms of yield if they did not suffer any crop loss in comparison with uninoculated plants, even though some plants showed restricted gall development. The distribution of fresh weight to galls, roots and shoots could be used to characterize the relative resistance of cultivars; in the most susceptible cultivars there was rapid gall development but little increase in root or shoot fresh weight between 6 and 12 weeks after inoculation. Differential response was determined during the 6 weeks following inoculation; the implications of this observation are discussed in relation to growth stage and rate of development of host and pathogen.
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Claims 4
Claim · model-written summary
Seedling, polythene-tunnel and field tests gave a similar ranking for resistance of four swede cultivars.
- Interactor
- Plasmodiophora brassicae
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Plasmodiophora brassicaee1pathogen - Outcome
- Similar ranking for resistancee2
- Comparator
- mature plants in field trialse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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Verbatim
e1“swede seedlings inoculated with standardized concentrations of resting spores of specific populations of Plasmodiophora brassicae”
e2“Similar ranking for resistance of four swede cultivars inoculated with one pathogen population was obtained from seedling tests in a glasshouse, from young plants in a polythene tunnel, and from mature plants in field trials”
Claim · model-written summary
A highly significant cultivar by pathogen population interaction was found for root fresh weight and mean disease category in the field.
- Taxon
- swedee1
- Interactor
- Plasmodiophora brassicaePlasmodiophora brassicaee1pathogen
- Outcome
- root fresh weight and mean disease categorye3
- Value
- p<0 001e3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“swede seedlings inoculated with standardized concentrations of resting spores of specific populations of Plasmodiophora brassicae”
e3“Differential resistance of the four cultivars to two pathogen populations evident in glasshouse seedling tests was more clearly demonstrated in the field where there was a highly significant cuitivar × pathogen population interaction (p<0 001) for both root fresh weight and mean disease category”
Claim · model-written summary
In the most susceptible cultivars there was rapid gall development between 6 and 12 weeks after inoculation.
Verbatim
e1“swede seedlings inoculated with standardized concentrations of resting spores of specific populations of Plasmodiophora brassicae”
e4“in the most susceptible cultivars there was rapid gall development but little increase in root or shoot fresh weight between 6 and 12 weeks after inoculation”
Claim · model-written summary
In the most susceptible cultivars there was little increase in root or shoot fresh weight between 6 and 12 weeks after inoculation.
Verbatim
e1“swede seedlings inoculated with standardized concentrations of resting spores of specific populations of Plasmodiophora brassicae”
e4“in the most susceptible cultivars there was rapid gall development but little increase in root or shoot fresh weight between 6 and 12 weeks after inoculation”