Abstract
Potato virus Y (PVY) infection is one of the greatest challenges to seed potato production in the United States. To determine how cultivar and seed type affect the development of systemic PVY infection, Russet Burbank and Russet Norkotah Colorado 3 cultivars were grown from two types of pre-nuclear seed (i.e., plantlets and minitubers) and Generation 3 (G3) tubers and challenged with PVY strain Wilga (PVYN-Wi). Systemic PVY infection was measured by assaying spread of virus from the inoculation site to upper non-inoculated leaves. The Burbank cultivar had a lower incidence of systemic PVY infection compared to the incidence of systemic PVY that developed in the Colorado 3 cultivar. Furthermore, Burbank plants grown from G3 tubers had a lower incidence of systemic PVY infection, as compared to Burbank plants grown from plantlets. Together our results indicate that both cultivar and seed type affect the development of systemic PVYN-Wi infections post-inoculation.
Highlights
Potatoes (Solanum tuberosum subsp. tuberosum) are the fourth most consumed food crop grown worldwide and were valued at $6 billion globally in 2005 (FAO 2008)
To further evaluate potential differences between two potato cultivars (i.e., Burbank and Colorado 3) and three seed generations to support systemic PVYN-Wi infection, potato plants were grown in greenhouse conditions and exposed to Potato virus Y (PVY) strain Wilga (PVYN-Wi) via mechanical inoculation (Supplemental Figs. 1– 4)
The number of new infections detected at four weeks postinoculation was not statistically different than at three weeks post-inoculation (P-value = 0.1289) (Supplemental Fig. 5) indicating that the majority of systemic PVY infections would be detected by 4 weeks post-inoculation
Summary
Potatoes (Solanum tuberosum subsp. tuberosum) are the fourth most consumed food crop grown worldwide and were valued at $6 billion globally in 2005 (FAO 2008). Tuberosum) are the fourth most consumed food crop grown worldwide and were valued at $6 billion globally in 2005 (FAO 2008). Potatoes are vegetatively propagated and pathogens, including viruses, spread more readily to progeny compared to crops that are propagated from true seeds (Karasev and Gray 2013). Potato seed certification laboratories and growers utilize several measures including tissue culture propagation, field inspection, and diagnostic testing to ensure pathogen-free seed potato stock. Pathogen transmission and disease are reduced by extensive pathogen monitoring programs and by limiting the number of field-grown generations.
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