Abstract
Various methods for testing blast resistance of rice varieties were compared by drawing a correlation diagram of each pair of the methods. In all the diagrams drawn, curvilinear regressions were observed. This indicates that the level of estimation of resistance is different between two methods compared, and that there are upper and lower limits of measurable range in all the methods. By injection method the resistance of varieties belonging to intermediate reaction classes was estimated to be more susceptible than by spraying method for inoculation. In spraying method, intermediate varieties were judged to be more resistant by the evaluation based on the type of predominant lesions than by the evaluation based on the type of the largest lesion. Intermediate varieties showed more resistant reaction by inoculation at the 4 week stage than at the 2 week stage of rice seedlings, and by inoculation with Ken 54-04 than with Ken 54-20. Interrelations among these phenomena were schematically shown in one figure (Fig. 11).A part of field resistance which cannot be detected in the greenhouse by the usual method for differentiating pathogenic races could be tested by the following methods: 1) lowering the measurable range of testing method by using a less aggressive fungus strain, 2) increasing the resistance of varieties by increasing plant age, or by growing plant under conditions similar to field conditions.
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Claims 8
Claim · model-written summary
All pairs of blast-resistance methods showed curvilinear regressions.
- Taxon
- rice varieties
Oryza sativae1 - Outcome
- curvilinear regressionse0
- Comparator
- all the diagramse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all the diagrams drawn, curvilinear regressions were observed.”
e1“blast resistance of rice varieties”
Claim · model-written summary
The methods differed in estimated resistance level and had upper and lower measurement limits.
- Taxon
- rice varietiesOryza sativae1
- Outcome
- level of estimation of resistance is differente0
- Comparator
- two methods comparede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of estimation of resistance is different between two methods compared, and that there are upper and lower limits of measurable range in all the methods.”
e1“blast resistance of rice varieties”
Claim · model-written summary
Injection classified intermediate varieties as more susceptible than spraying.
- Taxon
- rice varietiesOryza sativae1
- Outcome
- resistance of varieties belonging to intermediate reaction classese0
- Direction
- more susceptiblee0
- Comparator
- spraying methode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By injection method the resistance of varieties belonging to intermediate reaction classes was estimated to be more susceptible than by spraying method for inoculation.”
e1“rice varieties”
Claim · model-written summary
Spray evaluation based on predominant lesions classified intermediate varieties as more resistant than evaluation based on the largest lesion.
- Taxon
- rice varietiesOryza sativae1
- Outcome
- intermediate varieties were judged to be more resistante0
- Direction
- more resistante0
- Comparator
- evaluation based on the type of the largest lesione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In spraying method, intermediate varieties were judged to be more resistant by the evaluation based on the type of predominant lesions than by the evaluation based on the type of the largest lesion.”
e1“rice varieties”
Claim · model-written summary
Four-week inoculation gave a more resistant reaction than two-week inoculation.
- Taxon
- rice varietiesOryza sativae1
- Organ / stage
- rice seedlingse0
- Outcome
- more resistant reactione0
- Direction
- more resistante0
- Comparator
- 2 week stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intermediate varieties showed more resistant reaction by inoculation at the 4 week stage than at the 2 week stage of rice seedlings”
e1“rice varieties”
Claim · model-written summary
Inoculation with Ken 54-04 gave a more resistant reaction than Ken 54-20.
- Taxon
- riceOryza sativae2
- Interactor
- Ken 54-04e0pathogen
- Outcome
- more resistant reactione1
- Direction
- more resistante1
- Comparator
- Ken 54-20e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by inoculation with Ken 54-04 than with Ken 54-20.”
e1“Intermediate varieties showed more resistant reaction”
e2“rice seedlings”
Claim · model-written summary
Less aggressive fungal strains could reveal part of field resistance missed by the usual greenhouse test.
- Taxon
- rice varietiesOryza sativae1
- Interactor
- fungus straine0pathogen
- Outcome
- A part of field resistancee0
- Comparator
- usual methode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A part of field resistance which cannot be detected in the greenhouse by the usual method for differentiating pathogenic races could be tested by the following methods: 1) lowering the measurable range of testing method by using a less aggressive fungus strain”
e1“rice varieties”
Claim · model-written summary
Increasing plant age or using field-like growing conditions could reveal field resistance missed by the usual greenhouse test.
- Taxon
- rice varietiesOryza sativae2
- Outcome
- field resistancee1
- Comparator
- usual methode1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the resistance of varieties by increasing plant age, or by growing plant under conditions similar to field conditions.”
e1“A part of field resistance which cannot be detected in the greenhouse by the usual method”
e2“rice varieties”