Abstract
ABSTRACT An F 6 recombinant inbred line (RIL) spring wheat ( Triticum aestivum L.) population derived from RL6071, a stem rust susceptible line, and RL6058, a backcross line of Thatcher wheat with Lr34 that is highly resistant to stem rust, was evaluated for adult plant stem rust resistance in North Dakota in 1999, and in Kenya in 2007 and 2008. In all three tests, most RILs that exhibited low stem rust severity had Lr34 and most lines that had high disease severity lacked Lr34. Molecular mapping with DArT and simple sequence repeat (SSR) markers detected a quantitative trait locus (QTL) for adult plant stem rust resistance on chromosome arm 2BL. The RILs with both Lr34 and DArT marker wPt 5044 on 2BL had significantly lower stem rust severities compared with lines that only had Lr34 in North Dakota 1999 and Kenya 2008. Marker wPt 5044 alone did not significantly increase stem rust resistance. The QTL region on 2BL was not associated with any previously mapped Thatcher seedling stem rust resistance genes. The stem rust resistance in Thatcher enhanced by the presence of Lr34 is effective to different races in North America and Kenya and mapped to the same QTL.
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Claims 7
Claim · model-written summary
In all three tests low stem rust severity usually co-occurred with Lr34.
- Taxon
- wheat
Triticum aestivumt0 - Gene
- Lr34e0
- Outcome
- stem rust severitye0
- Direction
- lowe0
- Qualifier
- most RILse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all three tests, most RILs that exhibited low stem rust severity had Lr34”
t0“Wheat”
Claim · model-written summary
High disease severity usually occurred in lines lacking Lr34.
- Taxon
- wheatTriticum aestivumt0
- Gene
- Lr34e0
- Outcome
- disease severitye0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most lines that had high disease severity lacked Lr34”
t0“Wheat”
Claim · model-written summary
A QTL for adult plant stem rust resistance was mapped to chromosome arm 2BL.
- Taxon
- wheatTriticum aestivumt0
- Gene
- quantitative trait locus (QTL)e0
- Outcome
- adult plant stem rust resistancee0
- Qualifier
- chromosome arm 2BLe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“detected a quantitative trait locus (QTL) for adult plant stem rust resistance on chromosome arm 2BL”
t0“Wheat”
Claim · model-written summary
RILs with Lr34 and wPt 5044 had significantly lower rust severity than lines with only Lr34 in two tests.
- Taxon
- wheatTriticum aestivumt0
- Gene
- Lr34 and DArT marker wPt 5044e0
- Outcome
- stem rust severitiese0
- Direction
- lowere0
- Comparator
- lines that only had Lr34e0
- Setting
- North Dakota 1999 and Kenya 2008e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RILs with both Lr34 and DArT marker wPt 5044 on 2BL had significantly lower stem rust severities compared with lines that only had Lr34 in North Dakota 1999 and Kenya 2008”
t0“Wheat”
Claim · model-written summary
wPt 5044 alone did not significantly increase stem rust resistance.
- Taxon
- wheatTriticum aestivumt0
- Gene
- wPt 5044e0
- Outcome
- stem rust resistancee0
- Direction
- did not significantly increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Marker wPt 5044 alone did not significantly increase stem rust resistance”
t0“Wheat”
Claim · model-written summary
The 2BL QTL was not associated with earlier mapped Thatcher seedling resistance genes.
- Taxon
- wheatTriticum aestivumt0
- Gene
- QTL region on 2BLe0
- Outcome
- not associated with any previously mapped Thatcher seedling stem rust resistance genese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“QTL region on 2BL was not associated with any previously mapped Thatcher seedling stem rust resistance genes”
t0“Wheat”
Claim · model-written summary
Lr34 enhanced Thatcher resistance effective against races in North America and Kenya mapped to the same QTL.
- Taxon
- wheatTriticum aestivumt0
- Material
- Thatchere0
- Gene
- Lr34e0
- Outcome
- stem rust resistancee0
- Setting
- North America and Kenyae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stem rust resistance in Thatcher enhanced by the presence of Lr34 is effective to different races in North America and Kenya and mapped to the same QTL”
t0“Wheat”