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Novel Fusarium wilt resistance genes uncovered in natural and cultivated strawberry populations are found on three non-homoeologous chromosomes
Tuesday, 2022/06/21 | 08:18:26

Dominique D. A. PincotMitchell J. FeldmannMichael A. HardiganMishi V. VachevPeter M. HenryThomas R. GordonMarta BjornsonAlan RodriguezNicolas CoboRandi A. FamulaGlenn S. ColeGitta L. Coaker & Steven J. Knapp

Theoretical and Applied Genetics June 2022; vol. 135: 2121–2145

Key Message

Several Fusarium wilt resistance genes were discovered, genetically and physically mapped, and rapidly deployed via marker-assisted selection to develop cultivars resistant to Fusarium oxysporum f. sp. fragariae, a devastating soil-borne pathogen of strawberry.


Fusarium wilt, a soilborne disease caused by Fusarium oxysporum f. sp. fragariae, poses a significant threat to strawberry (Fragaria ×× ananassa) production in many parts of the world. This pathogen causes wilting, collapse, and death in susceptible genotypes. We previously identified a dominant gene (FW1) on chromosome 2B that confers resistance to race 1 of the pathogen, and hypothesized that gene-for-gene resistance to Fusarium wilt was widespread in strawberry. To explore this, a genetically diverse collection of heirloom and modern cultivars and octoploid ecotypes were screened for resistance to Fusarium wilt races 1 and 2. Here, we show that resistance to both races is widespread in natural and domesticated populations and that resistance to race 1 is conferred by partially to completely dominant alleles among loci (FW1FW2FW3FW4, and FW5) found on three non-homoeologous chromosomes (1A, 2B, and 6B). The underlying genes have not yet been cloned and functionally characterized; however, plausible candidates were identified that encode pattern recognition receptors or other proteins known to confer gene-for-gene resistance in plants. High-throughput genotyping assays for SNPs in linkage disequilibrium with FW1-FW5 were developed to facilitate marker-assisted selection and accelerate the development of race 1 resistant cultivars. This study laid the foundation for identifying the genes encoded by FW1-FW5, in addition to exploring the genetics of resistance to race 2 and other races of the pathogen, as a precaution to averting a Fusarium wilt pandemic.


See: https://link.springer.com/article/10.1007/s00122-022-04102-2


Figure 6: Genome-wide search for associations between SNPs and genes conferring resistance to Fusarium wilt race 1. The upper panels (AD) display likelihood odds (LODs) for single marker analyses of associations between SNP marker loci and Fusarium wilt race 1 resistance phenotypes in segregating populations genotyped with the 50K Axiom SNP array. LODs are plotted against physical positions of SNP marker loci in the 'Royal Royce' genome. LODs are shown for the Wiltguard S1S1 (A), Guardian S1S1 (B), 12C089P002 ×× PI602575 full-sib (C), and PI552277 ×× 12C089P002 full-sib (D) populations. The lower panel (E) displays LODs for analyses of associations between SNP marker loci (plotted along each chromosome) and Fusarium wilt race 1 resistance phenotypes on chromosomes in the Wiltguard S1S1 (FW3), Guardian S1S1 (FW2), 12C089P002 ×× PI602575 full-sib (FW5), and PI552277 ×× 12C089P002 full-sib (FW4) populations. The dotted lines specify the p=0.05p=0.05 significance threshold found by permutation testing (n=2,000n=2,000). Linkages maps are shown for chromosomes 1A in the Wiltguard S1S1 population, 2B in the Guardian S1S1 and 12C089P002 ×× PI602575 full-sib populations, and 6B in the PI552277 ×× 12C089P002 full-sib population. The box and whisker plots display 1-LOD support intervals (solid box) and 95% Bayes confidence intervals (whiskers) for QTL


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