Submitted to: Nematropica
Publication Type: Abstract Only
Publication Acceptance Date: 4/6/2000
Publication Date: N/A
Technical Abstract: Potato cyst nematodes (PCN) are composed of two species consisting of several races each. Although only race R1A (Ro1) of Globodera rostochiensis was known to occur in the United States, a program was initiated to breed for resistance to exotic races of PCN to guard against the introduction or emergence of new races. Seeds from crosses of Solanum tuberosum sp. andigena, S. tuberosum spp. tuberosum and S. vernei segregating for resistance to G. pallida races P4A and P5A were obtained from the International Potato Center. The progeny of this population was crossed with neotuberosum x S. tuberosum hybrids and resultant selections were backcrossed to two commercial cultivars with resistance to G. rostochiensis race R1A. Selections from these crosses were either intercrossed or crossed to a neotuberosum clone that possessed resistance to potato viruses (PVY) and late blight. The resultant progeny was evaluated in New York for resistance to G. rostochiensis races R1A and R2A (Ro2) and in Bolivia for resistance to G. pallida races P4A (Pa2), P5A (Pa3), and P6A. Of the five clones selected from these crosses three were resistant to G. rostochiensis races R1A and R2A, one was resistant to G. rostochiensis R1A and R2A and G. pallida races P4A and P5A, and one was resistant to the two races of G. rostochiensis, races P4A, P5A and P6A of G. pallida, late blight, and PVY. The latter clone with multiple resistance is now being considered for cultivar release.