Abstract
Abstract Fusarium head blight (FHB) is a devastating fungal disease of wheat. Since early 1990s, frequent FHB epidemics in major wheat‐growing regions have caused massive economic losses. Developing FHB‐resistant varieties is key to minimize the loss caused by the disease. In durum wheat ( Triticum turgidum L. ssp . durum ), however, it is challenged by lack of resistant sources. Introgression of resistance genes from wild relatives and bread wheat has resulted in some durum wheat lines with moderate resistance. Due to its complex genetic nature, integrating more resistance genes with moderate and even minor effects promises to provide high and durable FHB resistance. In this study, a base population was developed using diverse resistant lines and elite durum wheat breeding lines as founders and went through three cycles of phenotypic selection from 2019 to 2022, with FHB severity decreased by 34%. Six S 0:1 lines in Cycle 2 and Cycle 3 populations exhibited significantly lower FHB severity than the moderately susceptible check variety ND Riveland. The results suggested that recurrent phenotypic selection could effectively improve FHB resistance. Analysis of the founders and Cycle 2 and Cycle 3 populations with 2706 single nucleotide polymorphism markers indicated that there was little decrease in genetic variation due to selection. Genome‐wide association analysis found no markers significantly associated with FHB severity. Genomic prediction accuracies based on cross‐validation for FHB severity, plant height, and days‐to‐flowering were 0.51, 0.69, and 0.61, respectively. Recurrent genomic selection can shorten the select cycle to 4 months and therefore is promising to accelerate genetic improvement of FHB severity.
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Claims 8
Claim · model-written summary
FHB severity fell by 34% over three selection cycles.
- Taxon
- durum wheat
Triticum turgidum subsp. durume0 - Treatment
- three cycles of phenotypic selectione0
- Outcome
- FHB severitye0
- Direction
- decreasede0
- Value
- 34%e0
- Comparator
- founderse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a base population was developed using diverse resistant lines and elite durum wheat breeding lines as founders and went through three cycles of phenotypic selection from 2019 to 2022, with FHB severity decreased by 34%.”
Claim · model-written summary
Six selected lines had significantly lower FHB severity than ND Riveland.
Not reportedTaxon
Verbatim
e0“Six S 0:1 lines in Cycle 2 and Cycle 3 populations exhibited significantly lower FHB severity than the moderately susceptible check variety ND Riveland.”
Claim · model-written summary
Selection caused little decrease in genetic variation.
Not reportedTaxon
Verbatim
e0“Analysis of the founders and Cycle 2 and Cycle 3 populations with 2706 single nucleotide polymorphism markers indicated that there was little decrease in genetic variation due to selection.”
Claim · model-written summary
GWAS found no markers significantly associated with FHB severity.
Not reportedTaxonDirection
Verbatim
e0“Genome‐wide association analysis found no markers significantly associated with FHB severity.”
Claim · model-written summary
Cross-validated genomic prediction accuracy for FHB severity was 0.51.
Not reportedTaxon
Verbatim
e0“Genomic prediction accuracies based on cross‐validation for FHB severity, plant height, and days‐to‐flowering were 0.51, 0.69, and 0.61, respectively.”
Claim · model-written summary
Cross-validated genomic prediction accuracy for plant height was 0.69.
Not reportedTaxon
Verbatim
e0“Genomic prediction accuracies based on cross‐validation for FHB severity, plant height, and days‐to‐flowering were 0.51, 0.69, and 0.61, respectively.”
Claim · model-written summary
Cross-validated genomic prediction accuracy for days-to-flowering was 0.61.
Not reportedTaxon
Verbatim
e0“Genomic prediction accuracies based on cross‐validation for FHB severity, plant height, and days‐to‐flowering were 0.51, 0.69, and 0.61, respectively.”
Claim · model-written summary
Recurrent genomic selection could shorten the selection cycle to four months.
Not reportedTaxon
Verbatim
e0“Recurrent genomic selection can shorten the select cycle to 4 months and therefore is promising to accelerate genetic improvement of FHB severity.”