Abstract
Field experiment was carried out in hot and humid summer (Transplanted Aus) season to realize the yield loss of a susceptible rice variety Purbachi inoculated with bacterial blight (BB). Treatments consist of BB inoculations at different crop growth stages like maximum tillering (MT), panicle initiation (PI), booting (Bt), flowering and heading stages differently including a control (no BB inoculation). Disease severity index (DSI) was measured at 14 days after inoculation (DAI) and harvest. Data on 1000-grain-weight and yield was recorded at harvest. Significant variation on DSI was observed among different BB inoculated crop growth stages. MT, PI and Boot stage inoculations showed similar (DSI 7.1-8.0) but higher DSI than flowering and heading stages inoculation (3.2-5.3) even control (0.00) at 14 DAI. However, all the treatments showed similar DSI 9.0 at harvest. Bacterial blight can affect the grain weight to some extent although it was insignificant among the treatments (0.1-4.5%). DSI showed negative correlation with 1000-grain weight (r=-0.77*) and similarly with the yield (r=-0.97**). The yield ranged from 2.4-3.4 t/ha among the treatments. The yield loss was observed 5.8-30.4% in the BB inoculated treatments. MT, PI and Boot stages inoculation affected the yield much resulting 21-30.4% yield loss. It could be concluded that a susceptible variety can be affected with significant yield loss up to 30.4% with severe outbreak of B B. A simple regression equation = 4.09-0.211X( = Yield, X = BB severity score) is suggested for the prediction of yield loss in susceptible variety in summer season. Bangladesh Rice j. 2019, 23(1): 73-79
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Claims 10
Claim · model-written summary
Bacterial blight inoculation at maximum tillering, panicle initiation and booting stages caused 21-30.4% yield loss in susceptible rice variety Purbachi compared with the uninoculated control.
- Taxon
- Rice
Oryza sativat0 - Material
- Purbachie0
- Treatment
- MT, PI and Boot stages inoculatione5
- Interactor
- bacterial blighte0pathogen
- Outcome
- yield losse5
- Direction
- increaseinferrede5
- Value
- 21-30.4%e5
- Comparator
- control (no BB inoculation)e1
- Setting
- hot and humid summere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“MT, PI and Boot stages inoculation affected the yield much resulting 21-30.4% yield loss”
e1“including a control (no BB inoculation)”
e0“a susceptible rice variety Purbachi inoculated with bacterial blight (BB)”
e2“Field experiment was carried out in hot and humid summer (Transplanted Aus) season”
t0“Rice Yield Loss”
Claim · model-written summary
At 14 days after inoculation, disease severity index was higher when bacterial blight was inoculated at maximum tillering, panicle initiation or booting than at flowering and heading.
- Taxon
- RiceOryza sativat0
- Treatment
- MT, PI and Boot stage inoculationse1
- Interactor
- bacterial blighte0pathogen
- Outcome
- DSIe1
- Direction
- highere1
- Value
- 7.1-8.0e1
- Qualifier
- 3.2-5.3e1
- Comparator
- flowering and heading stages inoculatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“MT, PI and Boot stage inoculations showed similar (DSI 7.1-8.0) but higher DSI than flowering and heading stages inoculation (3.2-5.3) even control (0.00) at 14 DAI”
e0“inoculated with bacterial blight (BB)”
t0“Rice Yield Loss”
Claim · model-written summary
At harvest, all treatments showed similar disease severity index of 9.0 in rice.
- Taxon
- RiceOryza sativat0
- Outcome
- DSIe1
- Value
- 9.0e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“all the treatments showed similar DSI 9.0 at harvest”
t0“Rice Yield Loss”
Claim · model-written summary
Bacterial blight had an insignificant effect on grain weight in rice, with differences among treatments of 0.1-4.5%.
- Taxon
- RiceOryza sativat0
- Interactor
- Bacterial blighte1pathogen
- Outcome
- grain weighte1
- Value
- 0.1-4.5%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Bacterial blight can affect the grain weight to some extent although it was insignificant among the treatments (0.1-4.5%)”
t0“Rice Yield Loss”
Claim · model-written summary
Disease severity index was negatively correlated with 1000-grain weight in rice (r=-0.77).
- Taxon
- RiceOryza sativat0
- Interactor
- bacterial blighte0pathogen
- Outcome
- 1000-grain weighte1
- Direction
- negative correlatione1
- Value
- r=-0.77*e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“DSI showed negative correlation with 1000-grain weight (r=-0.77*) and similarly with the yield (r=-0.97**)”
e0“inoculated with bacterial blight (BB)”
t0“Rice Yield Loss”
Claim · model-written summary
Disease severity index was negatively correlated with yield in rice (r=-0.97).
- Taxon
- RiceOryza sativat0
- Interactor
- bacterial blighte0pathogen
- Outcome
- yielde1
- Direction
- negative correlatione1
- Value
- r=-0.97**e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“DSI showed negative correlation with 1000-grain weight (r=-0.77*) and similarly with the yield (r=-0.97**)”
e0“inoculated with bacterial blight (BB)”
t0“Rice Yield Loss”
Claim · model-written summary
Yield loss in bacterial blight inoculated rice treatments ranged from 5.8% to 30.4%.
- Taxon
- RiceOryza sativat0
- Interactor
- BBe1pathogen
- Outcome
- yield losse1
- Value
- 5.8-30.4%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The yield loss was observed 5.8-30.4% in the BB inoculated treatments”
t0“Rice Yield Loss”
Claim · model-written summary
Rice yield ranged from 2.4 to 3.4 t/ha among the inoculation treatments.
- Taxon
- RiceOryza sativat0
- Outcome
- yielde1
- Value
- 2.4-3.4 t/hae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The yield ranged from 2.4-3.4 t/ha among the treatments”
t0“Rice Yield Loss”
Claim · model-written summary
A simple regression equation, yield = 4.09 - 0.211 x BB severity score, is suggested for predicting yield loss in susceptible rice in the summer season.
- Taxon
- RiceOryza sativat0
- Outcome
- prediction of yield losse1
- Value
- 4.09-0.211Xe1
- Setting
- summer seasone1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“A simple regression equation = 4.09-0.211X( = Yield, X = BB severity score) is suggested for the prediction of yield loss in susceptible variety in summer season”
t0“Rice Yield Loss”
Claim · model-written summary
Disease severity index differed significantly among rice plants inoculated with bacterial blight at different growth stages.
- Taxon
- RiceOryza sativat0
- Treatment
- different BB inoculated crop growth stagese1
- Interactor
- BBe1pathogen
- Outcome
- DSIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Significant variation on DSI was observed among different BB inoculated crop growth stages”
t0“Rice Yield Loss”
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