The gene Ry adg that confers resistance to potato Y potyvirus (PVY) in the cultivated potato [Solanum tuberosum subsp. andigena, line 2x(v-2)7] is located on chromosome XI in a segment that contains three other known resistance genes in other syntenic solanaceous species. One of them is the gene N that controls resistance to tobacco mosaic tobamovirus in tobacco and has previously been isolated and sequenced. Three sequence-related, resistance gene-like (RGL) DNA fragments (354–369 bp) highly homologous to the gene N were PCR-amplified from the potato line 2x(v-2)7. Two RGL fragments (79 and 81% homologous to the N gene) co-segregated with Ry adg among the 77 F1 progeny tested. These RGLs may originate from a resistance gene family on chromosome XI. The potato line 2x(v-2)7 also expressed resistance to potato A potyvirus (PVA), which was controlled by another locus on chromosome XI mapped ca. 6.8 cM distal to Ry adg .
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Received: 18 December 1997 / Accepted: 30 December 1997
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Hämäläinen, J., Sorri, V., Watanabe, K. et al. Molecular examination of a chromosome region that controls resistance to potato Y and A potyviruses in potato. Theor Appl Genet 96, 1036–1043 (1998). https://doi.org/10.1007/s001220050836
- Key words Potato virus A
- Potato virus Y
- Resistance gene
- Diploid potato