Abstract
Abstract The blast of rice caused by Pyricularia oryzae is a disease prevalent throughout the world. The pathogen overwintering in rice straw and stubble for many years makes disease mitigation difficult. Among all available methods of managing disease, the use of resistant varieties is an economical approach. The objective of this study was to identify genotypes with slow‐blasting that could be used in breeding resistant hybrids. A total of 25 rice genotypes with different combinations of resistance genes were tested in 2013 and 2014 for rice blast resistance. The reactions of genotypes varied from highly resistant to highly susceptible. Of the 25 genotypes tested in 2013, only three were highly resistant to leaf blast (disease score: 1), while Rasi and RamanadStr3 were resistant (disease score: 2). Genotypes Co39 and HR12 were highly susceptible recording a disease score of 8 and the remaining genotypes were classified as susceptible with scores ranging from 5 to 7. In 2014, only Tetep genotype was found highly resistant to leaf blast with disease score ‘1’, and genotypes NILA57, RamanadStr3, Shia‐tia‐tsao, IR64, Rasi, and Tadukan were resistant with disease scores ranging from 2 to 3. The remaining genotypes were susceptible to leaf blast with disease scores of 4–7 and two genotypes Co39 and HR12 were highly susceptible to leaf blast (disease scores: 8–9). For neck blast, all genotypes were resistant (disease scores: 0–3) in both years except for CO39 and HR12, which were recorded as moderately resistant in 2013 and resistant in 2014. Based on 2 years of data on the apparent rate of infection, area under the disease progress curve, and components of slow‐blasting, the genotypes viz., IR64, Tadukan, Rasi, Tetep, and RamanadStr3 were identified as slow‐blasting types. Hence, these genotypes can be harnessed to develop blast‐resistant varieties in rice breeding programmes.
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Claims 14
Claim · model-written summary
Rice genotypes spanned highly resistant through highly susceptible blast reactions.
- Taxon
- rice
Oryza sativat0 - Interactor
- Pyricularia oryzae
Pyricularia oryzaet1pathogen - Outcome
- reactions of genotypese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reactions of genotypes varied from highly resistant to highly susceptible”
t0“rice genotypes”
t1“Pyricularia oryzae”
Claim · model-written summary
Three of 25 genotypes were highly resistant to leaf blast in 2013.
- Taxon
- riceOryza sativat0
- Outcome
- highly resistant to leaf blaste0
- Value
- disease score: 1e0
- Qualifier
- threee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of the 25 genotypes tested in 2013, only three were highly resistant to leaf blast (disease score: 1)”
t0“rice genotypes”
Claim · model-written summary
Rasi and RamanadStr3 were resistant to leaf blast in 2013, scoring 2.
- Taxon
- riceOryza sativat0
- Material
- Rasi and RamanadStr3e0
- Outcome
- resistante0
- Value
- disease score: 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rasi and RamanadStr3 were resistant (disease score: 2)”
t0“rice genotypes”
Claim · model-written summary
Co39 and HR12 were highly susceptible in 2013, scoring 8.
- Taxon
- riceOryza sativat0
- Material
- Co39 and HR12e0
- Outcome
- highly susceptiblee0
- Value
- a disease score of 8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes Co39 and HR12 were highly susceptible recording a disease score of 8”
t0“rice genotypes”
Claim · model-written summary
Remaining genotypes were susceptible in 2013, scoring 5–7.
- Taxon
- riceOryza sativat0
- Outcome
- susceptiblee0
- Value
- 5 to 7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the remaining genotypes were classified as susceptible with scores ranging from 5 to 7”
t0“rice genotypes”
Claim · model-written summary
Tetep was the only highly resistant leaf-blast genotype in 2014, scoring 1.
- Taxon
- riceOryza sativat0
- Material
- Tetepe0
- Outcome
- highly resistant to leaf blaste0
- Value
- disease score ‘1’e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2014, only Tetep genotype was found highly resistant to leaf blast with disease score ‘1’”
t0“rice genotypes”
Claim · model-written summary
Six named genotypes resisted leaf blast in 2014 with scores 2–3.
- Taxon
- riceOryza sativat0
- Material
- NILA57, RamanadStr3, Shia‐tia‐tsao, IR64, Rasi, and Tadukane0
- Outcome
- resistante0
- Value
- 2 to 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypes NILA57, RamanadStr3, Shia‐tia‐tsao, IR64, Rasi, and Tadukan were resistant with disease scores ranging from 2 to 3”
t0“rice genotypes”
Claim · model-written summary
Other genotypes were susceptible to leaf blast in 2014, scoring 4–7.
- Taxon
- riceOryza sativat0
- Outcome
- susceptible to leaf blaste0
- Value
- 4–7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The remaining genotypes were susceptible to leaf blast with disease scores of 4–7”
t0“rice genotypes”
Claim · model-written summary
Co39 and HR12 were highly susceptible to leaf blast in 2014, scoring 8–9.
- Taxon
- riceOryza sativat0
- Material
- Co39 and HR12e0
- Outcome
- highly susceptible to leaf blaste0
- Value
- 8–9e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two genotypes Co39 and HR12 were highly susceptible to leaf blast (disease scores: 8–9)”
t0“rice genotypes”
Claim · model-written summary
All genotypes except CO39 and HR12 resisted neck blast in both years, with scores 0–3.
- Taxon
- riceOryza sativat0
- Outcome
- resistante0
- Value
- 0–3e0
- Qualifier
- except for CO39 and HR12e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For neck blast, all genotypes were resistant (disease scores: 0–3) in both years except for CO39 and HR12”
t0“rice genotypes”
Claim · model-written summary
CO39 and HR12 were moderately resistant to neck blast in 2013.
- Taxon
- riceOryza sativat0
- Material
- CO39 and HR12e0
- Outcome
- moderately resistante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO39 and HR12, which were recorded as moderately resistant in 2013”
t0“rice genotypes”
Claim · model-written summary
CO39 and HR12 were resistant to neck blast in 2014.
- Taxon
- riceOryza sativat0
- Material
- CO39 and HR12e0
- Outcome
- resistant in 2014e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO39 and HR12, which were recorded as moderately resistant in 2013 and resistant in 2014”
t0“rice genotypes”
Claim · model-written summary
IR64, Tadukan, Rasi, Tetep and RamanadStr3 were identified as slow-blasting.
- Taxon
- riceOryza sativat0
- Material
- IR64, Tadukan, Rasi, Tetep, and RamanadStr3e0
- Outcome
- slow‐blasting typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IR64, Tadukan, Rasi, Tetep, and RamanadStr3 were identified as slow‐blasting types”
t0“rice genotypes”
Claim · model-written summary
The authors propose using those genotypes to breed blast-resistant rice.
- Taxon
- riceOryza sativae0
- Outcome
- develop blast‐resistant varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these genotypes can be harnessed to develop blast‐resistant varieties in rice breeding programmes”