Abstract
Change in susceptibility of rice spikelets (cvs. Koshihikari, Koganebare and Asominori) to bacterial grain rot, caused by Pseudomonas glumae, with time was examined by spraying bacterial suspension to panicles at different stages of flowering. Percentage of diseased spikelets of these varieties was highest when they were inoculated on flowering day and remained high when they were inoculated within 3 days after flowering. The disease was very low when spikelets were inoculated 2 days before or 4 days after flowering, even though spikelets were incubated under high humidity (RH>95%) condition for 24hr after inoculation. These results indicate that susceptibility of rice spikelets changes with time during a short, critical period before and after flowering and that high humidity at this stage is crucial to the infection of spikelets. Analysis on the relationship between susceptibility of a whole panicle and the flowering rate of spikelets within a panicle showed that panicle susceptibility depends on the rate of flowering per day after heading. This correlation indicates that susceptibility of rice plants to the disease in the field may be estimated from the heading rate of panicle in the field and from the extent of susceptibility of each panicle per day. The relative value for cumulative susceptibility of rice plants (Tt) in the field on the day t after first heading was represented by the value for total susceptibility of all panicles on the day t which was calculated by daily heading rate of panicles on days 0 to t after first heading in the field and by the panicle susceptibility on each day after heading. The Tt value of rice plants increased similarly from heading time, which is defined as the day when more than 40% of panicles have headed, and then decreased 5 to 6 days after heading time. Tt was very low about 12 days after heading time, suggesting that rice plants in the field are susceptible to the disease during a short length of time, i.e., from the heading time to about 11 days after that.
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Claims 6
Claim · model-written summary
Disease incidence was highest after inoculation on flowering day and stayed high within three days after flowering.
- Taxon
- Rice
Oryza sativat0 - Organ / stage
- spikeletse0
- Treatment
- inoculated on flowering daye0
- Interactor
- Pseudomonas glumae
Burkholderia glumaee1pathogen - Outcome
- Percentage of diseased spikeletse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percentage of diseased spikelets of these varieties was highest when they were inoculated on flowering day and remained high when they were inoculated within 3 days after flowering”
e1“caused by Pseudomonas glumae”
t0“Rice”
Claim · model-written summary
Disease was very low after inoculation two days before or four days after flowering despite high humidity.
- Taxon
- RiceOryza sativat0
- Treatment
- inoculated 2 days before or 4 days after floweringe0
- Interactor
- Pseudomonas glumaeBurkholderia glumaee1pathogen
- Outcome
- The diseasee0
- Direction
- very lowe0
- Qualifier
- high humidity (RH>95%) condition for 24hre0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The disease was very low when spikelets were inoculated 2 days before or 4 days after flowering, even though spikelets were incubated under high humidity (RH>95%) condition for 24hr after inoculation”
e1“caused by Pseudomonas glumae”
t0“Rice”
Claim · model-written summary
Panicle susceptibility depended on daily flowering rate after heading.
- Taxon
- RiceOryza sativat0
- Organ / stage
- paniclee0
- Outcome
- panicle susceptibilitye0
- Qualifier
- rate of flowering per day after headinge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“panicle susceptibility depends on the rate of flowering per day after heading”
t0“Rice”
Claim · model-written summary
The calculated cumulative susceptibility increased from heading and declined five to six days later.
- Taxon
- rice plantsOryza sativae0
- Outcome
- Tt valuee0
- Direction
- increasede0
- Qualifier
- decreased 5 to 6 days after heading timee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Tt value of rice plants increased similarly from heading time, which is defined as the day when more than 40% of panicles have headed, and then decreased 5 to 6 days after heading time”
Claim · model-written summary
Cumulative susceptibility was very low around 12 days after heading.
- Taxon
- RiceOryza sativat0
- Outcome
- Tte0
- Direction
- very lowe0
- Qualifier
- about 12 days after heading timee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tt was very low about 12 days after heading time”
t0“Rice”
Claim · model-written summary
The authors suggest using heading rate and daily panicle susceptibility to estimate field susceptibility.
- Taxon
- rice plantsOryza sativae0
- Outcome
- susceptibility of rice plants to the disease in the field may be estimatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“susceptibility of rice plants to the disease in the field may be estimated from the heading rate of panicle in the field and from the extent of susceptibility of each panicle per day”
The same questions in other papers
inoculation · Burkholderia glumae · Oryza sativa (rice)Positive and negative results
3 papers in the same direction as this paper · 5 in the opposite direction
- negative
- negative
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See all 9 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.