Submitted to: American Journal of Potato Research
Publication Type: Peer reviewed journal
Publication Acceptance Date: 2/1/2010
Publication Date: 4/16/2010
Citation: Whitworth J.L., Hamm, P.B., McIntosh, C.S. 2010. Effect of potato virus Y on yield of a clonal selection of Russet Norkotah potato. Amer J Potato Res. 87:310-314. Interpretive Summary: The variety Russet Norkotah is very susceptible to and has a latent reaction to Potato virus Y (PVY). Line or clonal selections of Russet Norkotah with more vigorous vines and later maturity dates have lead to higher yields compared to the standard Russet Norkotah (RN). PVY can cause yield reduction up to 40%, but no studies have been done on the amount of yield reduction in a later maturing clonal selection. This work compared RN and Russet Norkotah selection 3 (RN3-late maturing line) yields when infected with seed-borne PVY, current-season PVY, and no PVY. Results showed that PVY yield reduction can be comparable in RN3 and RN. Also the trend evident in all three years of the trial was that the seed-borne PVY caused the highest yield reduction followed by current-season PVY. Yield reduction was due to both smaller tubers and lower tuber numbers in PVY infected plants compared to no-PVY plants.
Technical Abstract: Successful selection of Russet Norkotah lines have produced larger, more vigorous vines and higher yields than the standard Russet Norkotah (RN). A significant disease, Potato Virus Y (PVY), while producing mild or “latent” symptom in this cultivar, has been shown to be significantly reduce yields. To determine PVY’s effect on yield, PVY infected RN and Russet Norkotah selection 3 (RN3) yields were compared after planting in Hermiston, Oregon in 2001, 2003, and 2006. After emergence, individual plants were ELISA tested for PVY multiple times during the growing season to confirm infection. Plants were categorized when infected; 1) current season, 2) seed borne or 3) “no PVY”. At harvest, total and marketable yield data was collected. RN3 produced higher total yields than RN, regardless of infection categories. Yield of RN and RN3 was reduced due to PVY in the following order; no PVY<<current season PVY<<seed borne PVY.