Extreme Resistance to Potato Virus A in Potato Cultivar Barbara is Independently Mediated by Ra and Rysto.

Plant Disease
Wei HuangX Nie

Abstract

Potato virus A (PVA) and potato virus Y (PVY) are two members of genus Potyvirus infecting potato crops worldwide. Host resistance offers an economical and effective means for the control or management of these viruses. In this study, 20 potato clones were screened for their resistance against PVA and PVY by mechanical or graft inoculation assay, and were explored for the relationship between extreme resistance genes Ra and Ry by the detection of molecular markers linked to Ryadg, Rysto, and Rychc. Six clones, including Barbara, Jizhangshu 8, Longshu 7, Longshu 8, M6, and Solara, were found to be extremely resistant to both PVA and PVY; three clones (AC142, Eshu 3, and Shepody) were deemed to be extremely resistant to PVA but susceptible to PVY. To further reveal the inheritance of the extreme resistance (ER) against PVA, a tetraploid F1 population of Barbara × F58050 (susceptible to both PVY and PVA) and a tetraploid BC1 population of BF145 (a PVA-resistant but PVY-susceptible progeny of Barbara × F58050) × F58050 were obtained. Phenotyping of the F1 and BC1 populations by graft inoculation with PVA showed segregation ratios of 3:1 and 1:1 (resistant:susceptible), respectively. These results suggest that two independent loci c...Continue Reading

References

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Jul 27, 2005·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Ye-Su SongAndrea Schwarzfischer
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Apr 15, 2008·Proceedings of the National Academy of Sciences of the United States of America·Betty Y-W ChungAndrew E Firth
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Jan 18, 2020·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Lesley TorranceGlenn J Bryan

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