Abstract
Grain protein concentration (GPC) is an important component of durum wheat ( Triticum turgidum L. var. durum ) quality. The ‘Langdon’‐ Triticum turgidum L. var. dicoccoides chromosome 6B substitution line [LDN(DIC‐6B)] contains the high GPC quantitative trait locus “ QGpc.ndsu.6Bb ” We evaluated the effect of this quantitative trait locus on GPC, grain yield, and other agronomic traits in an adapted durum wheat background, verified its location on chromosome 6B and determined its relationship to the GPC locus previously identified. A recombinant inbred population consisting of 110 lines segregating for high GPC was developed from the LDN(DIC‐6B) with two doses of adapted germplasm. This population was evaluated in the field for GPC at two locations in 1995, and for GPC, grain yield, and other agronomic characteristics at three locations in 1996. Segregation analysis for GPC showed a bimodal distribution, indicating a single genetic factor or a tightly linked gene cluster controlling high GPC. This high GPC locus was insensitive to environmental conditions. Grain protein concentration was not correlated with plant height, but was loosely correlated with grain yield and heading date. Quantitative trait locus analysis using simple regression and interval mapping procedures identified a locus flanked by Xcdo365 and Xmwg79 on chromosome 6B as having a major effect on GPC. This high GPC locus, which explained up to 72% of the phenotypic variance, accounted for a 15 g kg −1 increase in average GPC. Selection for the two markers flanking the GPC QTL would be highly effective in introgressing this QTL into durum wheat breeding programs.
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Claims 8
Claim · model-written summary
GPC segregation was bimodal, consistent with a single factor or tightly linked gene cluster.
- Taxon
- durum wheat
Triticum turgidum subsp. durume1 - Gene
- GPCe0
- Outcome
- bimodal distributione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Segregation analysis for GPC showed a bimodal distribution, indicating a single genetic factor or a tightly linked gene cluster controlling high GPC.”
e1“durum wheat ( Triticum turgidum L. var. durum )”
Claim · model-written summary
The high GPC locus was insensitive to environmental conditions.
- Taxon
- durum wheatTriticum turgidum subsp. durume1
- Gene
- high GPC locuse0
- Outcome
- insensitive to environmental conditionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This high GPC locus was insensitive to environmental conditions.”
e1“durum wheat ( Triticum turgidum L. var. durum )”
Claim · model-written summary
Grain protein concentration was not correlated with plant height.
- Taxon
- durum wheatTriticum turgidum subsp. durume1
- Outcome
- Grain protein concentratione0
- Direction
- not correlatede0
- Comparator
- plant heighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain protein concentration was not correlated with plant height”
e1“durum wheat ( Triticum turgidum L. var. durum )”
Claim · model-written summary
Grain protein concentration was loosely correlated with grain yield.
- Taxon
- durum wheatTriticum turgidum subsp. durume1
- Outcome
- Grain protein concentratione0
- Comparator
- grain yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain protein concentration was not correlated with plant height, but was loosely correlated with grain yield and heading date.”
e1“durum wheat ( Triticum turgidum L. var. durum )”
Claim · model-written summary
Grain protein concentration was loosely correlated with heading date.
- Taxon
- durum wheatTriticum turgidum subsp. durume1
- Outcome
- Grain protein concentratione0
- Comparator
- heading datee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain protein concentration was not correlated with plant height, but was loosely correlated with grain yield and heading date.”
e1“durum wheat ( Triticum turgidum L. var. durum )”
Claim · model-written summary
A chromosome 6B locus flanked by Xcdo365 and Xmwg79 had a major effect on GPC.
- Taxon
- durum wheatTriticum turgidum subsp. durume1
- Gene
- a locus flanked by Xcdo365 and Xmwg79 on chromosome 6Be0
- Outcome
- major effect on GPCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“identified a locus flanked by Xcdo365 and Xmwg79 on chromosome 6B as having a major effect on GPC.”
e1“durum wheat ( Triticum turgidum L. var. durum )”
Claim · model-written summary
The high GPC locus explained up to 72% of phenotypic variance.
- Taxon
- durum wheatTriticum turgidum subsp. durume1
- Gene
- high GPC locuse0
- Outcome
- phenotypic variancee0
- Value
- up to 72%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This high GPC locus, which explained up to 72% of the phenotypic variance”
e1“durum wheat ( Triticum turgidum L. var. durum )”
Claim · model-written summary
Selection using markers flanking the GPC QTL would be effective for introgression into durum wheat breeding.
- Taxon
- durum wheatTriticum turgidum subsp. durume0
- Gene
- GPC QTLe0
- Outcome
- introgressing this QTL into durum wheat breeding programse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Selection for the two markers flanking the GPC QTL would be highly effective in introgressing this QTL into durum wheat breeding programs.”