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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 702949 | 'WGC002' | Triticum aestivum L. subsp. aestivum | Nebraska, United States | NSGC |  | | 2023 | DEVELOPED | | | | | | Breeding material | ‘WGC002’ is a new spring wheat germplasm line (Triticum aestivum L., 2n=6x=AABBDD=42) containing Fusarium Head Resistance (FHB) gene Fhb7Th2 derived from the tall wheatgrass [Thinopyrum elongatum (Host) D. R. Dewey, 2n=2x=EE=14] (Zhang et al., 2022), which was developed cooperatively by the USDA-ARS and the North Dakota Agricultural Experiment Station using genomics-enabled chromosome engineering technology. WGC002 consistently exhibited resistance to FHB in inoculations of greenhouse grown plants. Obvious linkage drag has not been observed with the Th. elongatum chromosome segment containing Fhb7 in the ‘Chinese Spring’ (CS) wheat background. This new wild grass-derived FHB-resistant spring wheat germplasm is ready for immediate utilization in wheat breeding. WGC002 is a wheat-Th. elongatum chromosome 7B-7E translocation line, designated 7BS·7BL-7EL, with the wheat 7BL terminal region replaced by the homoeologous counterpart of the Th. elongatum 7EL containing Fhb7Th2. Chinese Spring (CS) ph1b mutant was used to induce meiotic homoeologous recombination between wheat chromosome 7B and Th. elongatum chromosome 7E. The double monosomics for wheat chromosome 7B and Th. elongatum chromosome 7E, which was homozygous for ph1b allele, were constructed to enhance meiotic homoeologous recombination between 7B-7E by chromosome-specific markers and fluorescent in situ hybridization (FISH). The initial FHB resistance source CS-Th. elongatum disomic substitution line 7B(7E) [DS 7E(7B)] was crossed to the CS ph1b mutant and their F1 progeny were backcrossed to CS ph1b mutant. The individuals that were double monosomic for the CS chromosome 7B and Th. elongatum chromosome 7E and homozygous for the ph1b mutant were selected from the BC1F1 population using molecular markers specific for chromosomes 7B and 7E and the ph1b mutant. The meiotic homoeologous recombination between wheat chromosome 7B and Th. elongatum chromosome 7E was induced in the double monosomic line (i.e., 7B’ + 7E’) homozygous for ph1b. The wheat-Th. elongatum chromosome 7B-7E translocation line ‘WGC002’ was selected from the 7B-7E recombinant population through molecular marker and FISH analyses following backcrossing to DS 7E(7B) line to remove the ph1b allele. The reaction of WGC002 to FHB was evaluated in multiple greenhouse environments, but not under field conditions due to its late maturity and tall stature. WGC002 exhibited similar resistance levels as the original resistance source DS 7E(7B), which were significantly higher than the wheat parent CS. The Fhb7 allele, designated Fhb7The2 in WGC002 is novel, and it contains 12 SNPs within the coding region of the gene relative to other previously reported Fhb7 alleles. Importantly, WGC002 does not contain the yellow flour pigment gene that is closely linked to the Fhb7 locus, which makes this FHB-resistant germplasm immediately usable for variety development (Zhang et al., 2022). In addition, WGC002 has the resistance gene Fhb7Th2 integrated into the wheat B sub-genome, hence WGC002 can be utilized in breeding for FHB resistance in both common and durum wheat. The 7B-7E recombinant chromosome 7BS·7BL-7EL in WGC002 was characterized and physically mapped using an integrated molecular and cytogenetic approach. The sequence-tagged site (STS) and PCR Allelic Competitive Extension (PACE) markers specific for Fhb7The2 were developed and their primer sequences and amplicon size will be published in JPR, which are useful in the marker-assisted selection of Fhb7The2 in wheat breeding. | 2158210 | PI 702949 |