Abstract
The development of rice blast disease in four slow-blasting (SB) genotypes was compared with that in the fast-blasting (FB) genotype Karuna, under natural field epidemics over a period of 3 years at five levels of nitrogen, in order to determine if the application of high doses of nitrogen influenced the expression of disease progress in the SB types. The treatment effects were compared through estimation of nine parameters viz . (i) lesion number (LN); (ii) area under disease progress curve (AUDPC); (iii) relative area under disease progress curve (RAUDPC); (iv) logistic apparent infection rate ( r ); (v) Gompertz apparent infection rate ( k ); (vi) logit line intercept (logit- a ); (vii) gompit line intercept (gompit- a ); (viii) time required for the disease to reach 0·25 severity in logistic ( T 25 r ); and (ix) Gompertz ( T 25 k ) models. There was a significant increase in LN, AUDPC, RAUDPC, r and k with increased levels of nitrogen application in all genotypes, but the rate of increase in disease severity was much lower in SB genotypes than the FB one and did not lead to breakdown of resistance in the SB genotypes, since severity level was much below the economic injury level. Among the nine derived parameters for evaluation of resistance LN, AUDPC, RAUDPC, r and k were best. The AUDPC and RAUDPC had lower degrees of error variance compared with the other parameters and hence were considered superior measures for characterization of disease progress curves.
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Claims 6
Claim · model-written summary
Increasing nitrogen significantly increased lesion number, AUDPC and RAUDPC in all rice genotypes.
- Taxon
- rice
Oryza sativat0 - Treatment
- increased levels of nitrogen applicatione0
- Outcome
- LN, AUDPC, RAUDPCe0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant increase in LN, AUDPC, RAUDPC, r and k with increased levels of nitrogen application in all genotypes”
t0“rice”
Claim · model-written summary
Increasing nitrogen significantly increased r and k in all genotypes.
- Taxon
- riceOryza sativat0
- Treatment
- increased levels of nitrogen applicatione0
- Outcome
- r and ke0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant increase in LN, AUDPC, RAUDPC, r and k with increased levels of nitrogen application in all genotypes”
t0“rice”
Claim · model-written summary
Disease severity increased much less rapidly in slow-blasting than fast-blasting genotypes.
- Taxon
- riceOryza sativat0
- Material
- SB genotypese0
- Outcome
- rate of increase in disease severitye0
- Direction
- much lowere0
- Comparator
- FB onee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of increase in disease severity was much lower in SB genotypes than the FB one”
t0“rice”
Claim · model-written summary
Increased nitrogen did not break down resistance in slow-blasting genotypes; severity stayed below economic injury level.
- Taxon
- riceOryza sativat0
- Material
- SB genotypese0
- Outcome
- breakdown of resistancee0
- Qualifier
- severity level was much below the economic injury levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not lead to breakdown of resistance in the SB genotypes, since severity level was much below the economic injury level”
t0“rice”
Claim · model-written summary
LN, AUDPC, RAUDPC, r and k were the best resistance evaluation parameters.
- Taxon
- riceOryza sativat0
- Outcome
- evaluation of resistancee0
- Direction
- beste0
- Comparator
- nine derived parameterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the nine derived parameters for evaluation of resistance LN, AUDPC, RAUDPC, r and k were best”
t0“rice”
Claim · model-written summary
AUDPC and RAUDPC had lower error variance than other parameters and were superior for disease progress curves.
- Taxon
- riceOryza sativat0
- Outcome
- error variancee0
- Direction
- lowere0
- Comparator
- other parameterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The AUDPC and RAUDPC had lower degrees of error variance compared with the other parameters and hence were considered superior measures for characterization of disease progress curves”
t0“rice”
The same questions in other papers
nitrogen · disease · Oryza sativa (rice)Positive and negative results
42 papers in the same direction as this paper · 39 in the opposite direction
- negative
- positive
- positive
78 papers more in this group
See all 82 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.