Abstract
Stem rust, caused by Puccinia graminis f. sp. tritici (Pgt), has potential to cause major yield losses in durum wheat. Development of durum cultivars with improved resistance to stem rust is a sustainable option for effective control of this disease. This study was conducted to identify genomic regions associated with resistance to Ug99-derived Pgt races using a doubled haploid (DH) mapping population produced from a cross between the resistant experimental line A9919-BY5C and the moderately susceptible cultivar ‘Strongfield’. The parents and DH lines were phenotyped for adult plant disease severity and infection response at Njoro, Kenya, for four years, and for seedling reaction to race TTKSK in a containment facility near Morden, Canada. Composite interval mapping using 612 SNP and DArT markers indicated four significant QTL for resistance to stem rust on chromosomes 1B, 4A, 5B, and 6A. A major and stable QTL from A9919-BY5C was identified on the short arm of chromosome 6A (6AS), which accounted for 71% of variation explained for seedling resistance and up to 46% for field resistance. This QTL mapped near the Sr8 locus and may be Sr8155B1, or a novel gene at the same location. Another QTL for adult plant resistance from A9919-BY5C was mapped on chromosome 1B that explained up to 14% of the phenotypic variation and likely is Sr14. Two minor QTL were identified in ‘Strongfield’ on chromosomes 4A and 5B that were inconsistent over years. Markers associated with the 6AS and 1B QTL can be used to proactively stack resistance to Ug99-derived races of Pgt into Canadian durum wheat.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Four significant stem rust resistance QTL mapped to chromosomes 1B, 4A, 5B, and 6A.
- Taxon
- durum wheat
Triticum turgidum subsp. durumt0 - Interactor
- stem ruste0pathogen
- Outcome
- QTL for resistance to stem ruste0
- Value
- foure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four significant QTL for resistance to stem rust on chromosomes 1B, 4A, 5B, and 6A”
t0“durum wheat”
Claim · model-written summary
The 6AS QTL explained 71% of seedling resistance variation.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Material
- A9919-BY5Ce0
- Gene
- QTLe0
- Outcome
- variation explained for seedling resistancee0
- Value
- 71%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A major and stable QTL from A9919-BY5C was identified on the short arm of chromosome 6A (6AS), which accounted for 71% of variation explained for seedling resistance and up to 46% for field resistance”
t0“durum wheat”
Claim · model-written summary
The same 6AS QTL explained up to 46% of field resistance variation.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Material
- A9919-BY5Ce0
- Gene
- QTLe0
- Outcome
- field resistancee0
- Value
- 46%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A major and stable QTL from A9919-BY5C was identified on the short arm of chromosome 6A (6AS), which accounted for 71% of variation explained for seedling resistance and up to 46% for field resistance”
t0“durum wheat”
Claim · model-written summary
The 6AS QTL mapped near Sr8 and might be Sr8155B1 or a novel gene.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Gene
- Sr8e0
- Outcome
- QTL mapped near the Sr8 locuse0
- Qualifier
- may be Sr8155B1, or a novel gene at the same locatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This QTL mapped near the Sr8 locus and may be Sr8155B1, or a novel gene at the same location”
t0“durum wheat”
Claim · model-written summary
The A9919-BY5C chromosome 1B QTL explained up to 14% of adult plant resistance variation.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Material
- A9919-BY5Ce0
- Gene
- QTLe0
- Outcome
- phenotypic variatione0
- Value
- 14%e0
- Qualifier
- likely is Sr14e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Another QTL for adult plant resistance from A9919-BY5C was mapped on chromosome 1B that explained up to 14% of the phenotypic variation and likely is Sr14”
t0“durum wheat”
Claim · model-written summary
Two minor Strongfield QTL on chromosomes 4A and 5B were inconsistent across years.
- Taxon
- durum wheatTriticum turgidum subsp. durumt0
- Material
- Strongfielde0
- Outcome
- minor QTLe0
- Value
- Twoe0
- Qualifier
- inconsistent over yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two minor QTL were identified in ‘Strongfield’ on chromosomes 4A and 5B that were inconsistent over years”
t0“durum wheat”
Claim · model-written summary
The authors proposed using markers for the 6AS and 1B QTL to stack resistance.
- Taxon
- durum wheatTriticum turgidum subsp. durume0
- Interactor
- Pgte0pathogen
- Gene
- 6AS and 1B QTLe0
- Outcome
- proactively stack resistance to Ug99-derived races of Pgte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Markers associated with the 6AS and 1B QTL can be used to proactively stack resistance to Ug99-derived races of Pgt into Canadian durum wheat”