Mapping, stacking and characterization of a novel resistance haplotype against GpaVvrn-virulent Globodera pallida derived from wild potato relative Solanum brevicaule

The GpaXIbrc resistance haplotype from wild potato relative Solanum brevicaule maps to chromosome 11 (42.83–42.85 Mb) and significantly increases resistance to a GpaVvrn-virulent Globodera pallida population (AMPOP01).

• Why it matters: Virulent G. pallida populations are breaking through broadly used resistance genes, creating a need for new resistance alleles to maintain effective potato control.
• What they did: Using k-mer based bulked segregant analysis, the study mapped the resistance locus to 42.83–42.85 Mb on chromosome 11 and tested the GpaXIbrc marker and haplotype in resistance assays, including stacking with GpaXItar, GpaVvrn, and GpaIXvrn.
• The result: Stacking GpaXIbrc with other haplotypes produced a significant increase in resistance, with the largest effect in GpaVvrn + GpaIXvrn and GpaXItar + GpaXIbrc combinations, and in vitro bioassays indicated a resistance mechanism distinct from GpaXIspl, supporting a novel allele from S. brevicaule.

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