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Maping the thm1 mutation via bulked segregation analysis (BSA)

ABSTRACT: To map the thm1 mutation via bulked segregation analysis (BSA), the thm1 mutant was backcrossed once with WT to generate the BC1F2 population. Phenotypes in the second filial generation (BC1F2) progeny were analyzed for their ability to trigger HSCE in response to heat shock. Three DNA pools, each consisting of 25 plants showing thm1‑like HSCE, 25 plants showing WT‑like HSCE, and 18 WT reference individuals, were sequenced.Approximately 50 BC1F2 lines exhibiting the lowest and highest HSCE phenotypes were selected and pooled to generate thm1-like and WT-like bulks, respectively. Genomic DNA was extracted from rosette leaves of the bulks and WT using a 2% cetyltrimethylammonium bromide (CTAB) method. The WT DNA was used as an internal reference.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE310781 | GEO | 2026/03/20

REPOSITORIES: GEO

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Project description:Powdery mildew resistance gene Pm4b, originating from Triticum perscicum, is effective against the prevalent Blumeria graminis f. sp. tritici (Bgt) isolates from certain regions of wheat production in China. The lack of tightly linked molecular markers with the target gene prevents the precise identification of Pm4b during the application of molecular marker-assisted selection (MAS). The strategy that combines the RNA-seq technique and the bulked segregant analysis (BSR-seq) was applied in an F2:3 mapping population (237 families) derived from a pair of isogenic lines VPM1/7*Bainong 3217 F4 (carrying Pm4b) and Bainong 3217 to develop more closely linked molecular markers. RNA-seq analysis of the two phenotypically contrasting RNA bulks prepared from the representative F2:3 families generated 20,745,939 and 25,867,480 high-quality read pairs, and 82.8% and 80.2% of them were uniquely mapped to the wheat whole genome draft assembly for the resistant and susceptible RNA bulks, respectively. Variant calling identified 283,866 raw single nucleotide polymorphisms (SNPs) and InDels between the two bulks. The SNPs that were closely associated with the powdery mildew resistance were concentrated on chromosome 2AL. Among the 84 variants that were potentially associated with the disease resistance trait, forty-six variants were enriched in an about 25 Mb region at the distal end of chromosome arm 2AL. Four Pm4b-linked SNP markers were developed from these variants. Based on the sequences of Chinese Spring where these polymorphic SNPs were located, 98 SSR primer pairs were designed to develop distal markers flanking the Pm4b gene. Three markers, Xics13, Xics43 and Xics76, were incorporated in the new genetic linkage map, which located Pm4b in a 3.0 cM genetic interval spanning a 6.7 Mb physical genomic region. This region had a co-linear relationship with Brachypodium distachyum chromosome 5, rice chromosome 4, and sorghum chromosome 6. Seven genes associated with disease resistance were predicted in this collinear genomic region, which included protein kinases of PKc_like super family, C2 domain protein, peroxidase activity protein, Mlo family protein, and catalytic domain of the serine/threonine kinases (PKc_like super family). The markers developed in the present study facilitate identification of Pm4b during its MAS practice.

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Maping the thm1 mutation via bulked segregation analysis (BSA)

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