Abstract
BACKGROUND: Jalmagna is a popular deepwater rice variety with farmers of India because of its good yield under waterlogged condition. However, the variety is highly susceptible to bacterial blight (BB) disease. The development of resistant cultivars has been the most effective and economical strategy to control the disease under deepwater situation. Three resistance genes (xa5 + xa13 + Xa21) were transferred from Swarna BB pyramid line, using a marker-assisted backcrossing (MAB) breeding strategy, into the BB-susceptible elite deepwater cultivar, Jalmagna. RESULTS: Molecular marker integrated backcross breeding program has been employed to transfer three major BB resistance genes (Xa21, xa13 and xa5) into Jalmagna variety. During backcross generations, markers closely linked to the three genes were used to select plants possessing these resistance genes and markers polymorphic between donor and recurrent parent were used to select plants that have maximum contribution from the recurrent parent genome. A selected BC3F1 plant was selfed to generate homozygous BC3F2 plants with different combinations of BB resistance genes. The three-gene pyramid and two gene pyramid lines exhibited high levels of resistance against the BB pathogen. Under conditions of BB infection, the three-gene pyramided lines exhibited a significant yield advantage over Jalmagna. The selected pyramided lines showed all agro-morphologic traits of Jalmagna without compromising the yield. CONCLUSION: The three major BB resistance genes pyramided lines exhibited high level of resistance and are expected to provide durable resistance under deep water situation where control through chemicals is less effective. High similarity in agro-morphologic traits and absence of antagonistic effects for yield and other characters were observed in the best pyramided lines.
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Claims 5
Claim · model-written summary
Three-gene and two-gene pyramided lines exhibited high levels of resistance against the bacterial blight pathogen in rice.
- Taxon
- rice
Oryza sativae0 - Material
- three-gene pyramid and two gene pyramid linese1
- Interactor
- BB pathogene1pathogen
- Outcome
- high levels of resistancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jalmagna is a popular deepwater rice variety with farmers of India”
e1“The three-gene pyramid and two gene pyramid lines exhibited high levels of resistance against the BB pathogen”
Claim · model-written summary
Under bacterial blight infection, the three-gene pyramided lines had a significant yield advantage over Jalmagna.
- Taxon
- riceOryza sativae0
- Material
- three-gene pyramided linese2
- Treatment
- BB infectione2
- Outcome
- yielde2
- Direction
- higherinferrede2
- Comparator
- Jalmagnae2
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jalmagna is a popular deepwater rice variety with farmers of India”
e2“Under conditions of BB infection, the three-gene pyramided lines exhibited a significant yield advantage over Jalmagna”
Claim · model-written summary
Selected pyramided lines showed all agro-morphologic traits of Jalmagna without compromising yield.
- Taxon
- riceOryza sativae0
- Material
- pyramided linese3
- Outcome
- agro-morphologic traitse3
- Qualifier
- without compromising the yielde3
- Comparator
- Jalmagnae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jalmagna is a popular deepwater rice variety with farmers of India”
e3“The selected pyramided lines showed all agro-morphologic traits of Jalmagna without compromising the yield”
Claim · model-written summary
The best pyramided lines showed high similarity in agro-morphologic traits and no antagonistic effects on yield and other characters.
- Taxon
- riceOryza sativae0
- Material
- best pyramided linese4
- Outcome
- similarity in agro-morphologic traitse4
- Qualifier
- absence of antagonistic effects for yield and other characterse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jalmagna is a popular deepwater rice variety with farmers of India”
e4“High similarity in agro-morphologic traits and absence of antagonistic effects for yield and other characters were observed in the best pyramided lines”
Claim · model-written summary
The pyramided lines are expected to provide durable bacterial blight resistance under deep water conditions where chemical control is less effective.
- Taxon
- riceOryza sativae0
- Outcome
- durable resistance under deep water situatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Jalmagna is a popular deepwater rice variety with farmers of India”
e6“are expected to provide durable resistance under deep water situation where control through chemicals is less effective”
The same questions in other papers
infection · yield · Oryza sativa (rice)Positive and negative results
8 papers in the same direction as this paper · 34 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- negative
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See all 44 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.