Submitted to: Potato Association of America Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2000
Publication Date: 12/15/2000
Citation: BROWN, C.R., CORSINI, D.L., NOVY, R.G. BREEDING FOR PVY IMMUNITY: OLD GENES, NEW FRIENDS. AMERICAN JOURNAL OF POTATO RESEARCH. 77:394. 2000.
Technical Abstract: Potato Virus Y (PVY) is an important pathogen worldwide. Transmitted in a transient fashion by aphids, it is generally considered to be a difficult control problem in seed programs compared to potato leafroll virus. Presence of inoculum in latently infected varieties, a large build-up in over the past few years and the ineffectiveness of aphicides have contributed to an emergency level of loss in certified seed and large depredation in breeding programs in Western States. Curiously, dominant monogenes conditioning immunity to all strains of PVY have long been available to breeders, yet no important varieties harbor any of these. A program to identify PVY immune breeding parents harboring the Ry(sto) and Ry(adg) genes by graft yielded a group of immune clones with diverse attributes. Results from grafting these and transgenic clones indicate that ELISA values of immune clones are 8% of the susceptible clones, 0.06 versus 0.78. Immune potatoes when inoculated do not buildup virus in foliage, do not pass virus to daughter tubers or provide inoculum to vectors. Full utilization of immunity genes requires strong economic need, immune parents with high breeding value, and cheap, high throughput methods to identify immune selections in breeding programs.