Abstract
Recent epidemics of fusarium head blight (FHB), caused by Fusarium graminearum Schwabe (telomorph: Gibberella zeae ), in the USA and Canada have caused severe yield and quality losses in wheat ( Triticum aestivum L.). Development of resistant cultivars has been difficult because of the complex inheritance of resistance and confounding environmental effects. This study was conducted to identify and map DNA markers linked to genes associated with FHB resistance. A population of 112 F 5 ‐derived recombinant inbred (RI) wheat lines from the cross ‘Sumai 3’ (resistant)/‘Stoa’ (moderately susceptible) was evaluated in two greenhouse experiments for Type II resistance (spread within the spike). On the basis of restriction fragment length polymorphism (RFLP) marker analyses, five genomic regions were significantly (P < 0.01) associated with FHB resistance, three derived from Sumai 3 and two from Stoa. Regions on Chromosomes 3BS (from Sumai 3) and 2AL (from Stoa) were identified by interval analysis using a LOD threshold of 3.0. These two quantitative trait loci (QTL) have been assigned the gene designations QFhs.ndsu‐3B and QFhs.ndsu‐2A , respectively. Recombinant inbred lines with these two QTL had a median severity of 20.9%, compared with 36.2% for all RI lines. The best RFLP marker in the 3BS region explained 15.4% of the variation and a multiple regression model consisting of three QTL explained 29.5% of the variation. These results indicate that resistance to FHB is inherited in a quantitative manner and that marker‐assisted selection may aid the development of FHB‐resistant cultivars.
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Claims 8
Claim · model-written summary
Five genomic regions were significantly associated with Fusarium head blight resistance in wheat
- Taxon
- wheat
Triticum aestivumt0 - Interactor
- Fusarium graminearum
_on_Corn_(Zea_mays)_at_Waimea%2C_Hawaii.jpg?width=60)
Fusarium graminearume2pathogen - Outcome
- FHB resistancee1
- Qualifier
- P < 0.01e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_on_Corn_(Zea_mays)_at_Waimea%2C_Hawaii.jpg?width=500)
Verbatim
t0“in Wheat”
e1“five genomic regions were significantly (P < 0.01) associated with FHB resistance, three derived from Sumai 3 and two from Stoa”
e2“fusarium head blight (FHB), caused by Fusarium graminearum Schwabe”
Claim · model-written summary
Chromosome 3BS region from Sumai 3 was identified by interval analysis at a LOD threshold of 3.0
- Taxon
- wheatTriticum aestivumt0
- Material
- Sumai 3e2
- Organ / stage
- Chromosomes 3BSe2
- Outcome
- Regionse2
- Qualifier
- using a LOD threshold of 3.0e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in Wheat”
e2“Regions on Chromosomes 3BS (from Sumai 3) and 2AL (from Stoa) were identified by interval analysis using a LOD threshold of 3.0”
Claim · model-written summary
Chromosome 2AL region from Stoa was identified by interval analysis at a LOD threshold of 3.0
- Taxon
- wheatTriticum aestivumt0
- Material
- Stoae2
- Organ / stage
- 2ALe2
- Outcome
- Regionse2
- Qualifier
- using a LOD threshold of 3.0e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in Wheat”
e2“Regions on Chromosomes 3BS (from Sumai 3) and 2AL (from Stoa) were identified by interval analysis using a LOD threshold of 3.0”
Claim · model-written summary
Recombinant inbred lines carrying the two QTL had a lower median severity (20.9%) than all RI lines (36.2%)
- Taxon
- wheatTriticum aestivumt0
- Material
- Recombinant inbred linese4
- Treatment
- these two QTLe4
- Outcome
- median severitye4
- Direction
- lowerinferrede4
- Value
- 20.9%e4
- Comparator
- all RI linese4
- Setting
- two greenhouse experimentse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in Wheat”
e4“Recombinant inbred lines with these two QTL had a median severity of 20.9%, compared with 36.2% for all RI lines”
e3“evaluated in two greenhouse experiments for Type II resistance (spread within the spike)”
Claim · model-written summary
The best RFLP marker in the 3BS region explained 15.4% of the variation in FHB resistance
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- 3BS regione5
- Outcome
- variatione5
- Value
- 15.4%e5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in Wheat”
e5“The best RFLP marker in the 3BS region explained 15.4% of the variation and a multiple regression model consisting of three QTL explained 29.5% of the variation”
Claim · model-written summary
A multiple regression model of three QTL explained 29.5% of the variation in FHB resistance
- Taxon
- wheatTriticum aestivumt0
- Treatment
- three QTLe5
- Outcome
- variatione5
- Value
- 29.5%e5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in Wheat”
e5“The best RFLP marker in the 3BS region explained 15.4% of the variation and a multiple regression model consisting of three QTL explained 29.5% of the variation”
Claim · model-written summary
Resistance to FHB is inherited in a quantitative manner
- Taxon
- wheatTriticum aestivumt0
- Outcome
- resistance to FHBe6
- Qualifier
- inherited in a quantitative mannere6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in Wheat”
e6“resistance to FHB is inherited in a quantitative manner”
Claim · model-written summary
Marker-assisted selection may aid the development of FHB-resistant wheat cultivars
- Taxon
- wheatTriticum aestivumt0
- Outcome
- development of FHB‐resistant cultivarse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in Wheat”
e7“marker‐assisted selection may aid the development of FHB‐resistant cultivars”