Abstract
Evaluation of rice for resistance to rice blast disease caused by Pyricularia grisea usually is conducted in upland (nonflooded) disease nurseries, although all commercial U.S. rice is produced under flood irrigation. Upland rice is more susceptible to leaf blast than is flooded rice, and the magnitude of this differential susceptibility can vary among cultivars. This 2-year study was undertaken to determine (i) the relationship between rates of disease development (slow-blasting) in upland and flooded rice and (ii) the value to a rice breeding program of establishing a flooded blast nursery, a facility far more difficult to manage than an upland nursery. Among 200 rice lines compared for leaf blast susceptibility under upland and flooded cultures, only 7 were rated as slightly more resistant under upland culture and 136 rated more resistant under flooded culture. Disease ratings under upland and flooded cultures were highly correlated (R = 0.819). Among 14 preselected cultivars over 2 years, disease development curves under upland and flooded cultures were highly correlated (R = 0.990). The cultivars with intermediate susceptibility under upland culture appeared to benefit most from flooded culture. Upland culture provided more opportunities to assess slow-blasting than did flooded culture, since many lines that produced susceptible-type lesions in upland culture failed to do so under flooded culture. It was concluded that adequate information on comparative leaf blast resistance among rice lines was attainable from upland blast nurseries and that routine evaluation of rice breeding lines for blast resistance in flooded nurseries was not necessary.
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Claims 9
Claim · model-written summary
Flooded culture rated 136 of 200 rice lines more resistant to leaf blast than upland culture.
- Taxon
- rice
Oryza sativat0 - Treatment
- flooded culturee1
- Outcome
- leaf blast susceptibilitye1
- Direction
- more resistante1
- Value
- 136e1
- Comparator
- upland culturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Slow-Blasting in Rice Grown”
e1“Among 200 rice lines compared for leaf blast susceptibility under upland and flooded cultures, only 7 were rated as slightly more resistant under upland culture and 136 rated more resistant under flooded culture”
Claim · model-written summary
Upland culture rated 7 of 200 rice lines slightly more resistant to leaf blast than flooded culture.
- Taxon
- riceOryza sativat0
- Treatment
- upland culturee1
- Outcome
- leaf blast susceptibilitye1
- Direction
- slightly more resistante1
- Value
- 7e1
- Comparator
- flooded culturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Slow-Blasting in Rice Grown”
e1“Among 200 rice lines compared for leaf blast susceptibility under upland and flooded cultures, only 7 were rated as slightly more resistant under upland culture and 136 rated more resistant under flooded culture”
Claim · model-written summary
Disease ratings under upland and flooded cultures were highly correlated (R = 0.819).
- Taxon
- riceOryza sativat0
- Outcome
- Disease ratingse2
- Value
- R = 0.819e2
- Comparator
- flooded culturese2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Slow-Blasting in Rice Grown”
e2“Disease ratings under upland and flooded cultures were highly correlated (R = 0.819)”
Claim · model-written summary
Disease development curves under upland and flooded cultures were highly correlated among 14 preselected cultivars (R = 0.990).
- Taxon
- riceOryza sativat0
- Material
- 14 preselected cultivarse3
- Outcome
- disease development curvese3
- Value
- R = 0.990e3
- Qualifier
- over 2 yearse3
- Comparator
- flooded culturese3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Slow-Blasting in Rice Grown”
e3“Among 14 preselected cultivars over 2 years, disease development curves under upland and flooded cultures were highly correlated (R = 0.990)”
Claim · model-written summary
Rice cultivars with intermediate susceptibility under upland culture appeared to benefit most from flooded culture.
- Taxon
- riceOryza sativat0
- Material
- cultivars with intermediate susceptibilitye4
- Treatment
- flooded culturee4
- Outcome
- benefite4
- Comparator
- upland culturee4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Slow-Blasting in Rice Grown”
e4“The cultivars with intermediate susceptibility under upland culture appeared to benefit most from flooded culture”
Claim · model-written summary
Upland culture gave more opportunities to assess slow-blasting than flooded culture.
- Taxon
- riceOryza sativat0
- Treatment
- Upland culturee5
- Outcome
- opportunities to assess slow-blastinge5
- Direction
- moree5
- Comparator
- flooded culturee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Slow-Blasting in Rice Grown”
e5“Upland culture provided more opportunities to assess slow-blasting than did flooded culture”
Claim · model-written summary
Many lines with susceptible-type lesions in upland culture failed to show them under flooded culture.
- Taxon
- riceOryza sativat0
- Treatment
- flooded culturee6
- Outcome
- susceptible-type lesionse6
- Direction
- failed to do soe6
- Comparator
- upland culturee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Slow-Blasting in Rice Grown”
e6“many lines that produced susceptible-type lesions in upland culture failed to do so under flooded culture”
Claim · model-written summary
Routine evaluation of rice breeding lines for blast resistance in flooded nurseries is not necessary.
- Taxon
- riceOryza sativat0
- Outcome
- routine evaluation of rice breeding lines for blast resistance in flooded nurseriese7
- Qualifier
- not necessarye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Slow-Blasting in Rice Grown”
e7“routine evaluation of rice breeding lines for blast resistance in flooded nurseries was not necessary”
Claim · model-written summary
Adequate information on comparative leaf blast resistance among rice lines can be obtained from upland blast nurseries.
- Taxon
- riceOryza sativat0
- Outcome
- adequate information on comparative leaf blast resistancee6
- Setting
- upland blast nurseriese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: conclusion on the adequacy of upland nurseries; closest kind
Verbatim
t0“Slow-Blasting in Rice Grown”
e6“adequate information on comparative leaf blast resistance among rice lines was attainable from upland blast nurseries”
The same questions in other papers
flooding · disease · Oryza sativa (rice)Positive and negative results
9 papers in the same direction as this paper · 12 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- no effect
19 papers more in this group
See all 23 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.