|Novy, Richard - Rich|
|Dandurand, Louise Marie - University Of Idaho|
|Wang, Xiaohong - University Of Idaho|
Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/19/2018
Publication Date: 11/1/2018
Citation: Whitworth, J.L., Novy, R.G., Zasada, I.A., Dandurand, L., Wang, X., Kuhl, J.C. 2018. Resistance of potato breeding clones and cultivars to three species of potato cyst nematode. Plant Disease. 102:2120-2128.
Interpretive Summary: Potato cyst nematodes (PCN) currently under quarantine regulations in the U.S. and Canada are known as the pale cyst nematode (Globodera pallida) and the golden cyst nematode (G. rostochiensis). A new cyst nematode species, G. ellingtonae was discovered in Oregon and Idaho in 2008 and is not currently considered a quarantine pest. New detections of PCN occurred in 2006 in Idaho, U.S.A. (pale cyst) and Quebec, Canada (golden cyst). Resistant potato varieties can be used as a tool in eradication efforts and allow growers to produce a marketable crop. Resistance to the golden nematode is available from dominant gene (H1) that has been incorporated into commercial varieties. Resistance to pale cyst nematode and certainly G. ellingtonae is not as well developed. This study evaluated 22 breeding lines/varieties for resistance to all three nematode species. Resistance to golden cyst nematode was found in many of the entries, resistance to pale cyst nematode was also found, but the resistance levels were not as high. A correlation existed among seven entries for high resistance to golden cyst nematode and G. ellingtonae suggesting common resistance genes against both nematode species. Results from this work will be used to develop resistant breeding populations leading to development of new varieties with multiple species nematode resistance.
Technical Abstract: In the U.S. potato cyst nematodes, Globodera rostochiensis and G. pallida, are regulated as quarantine pests. A new cyst nematode species, Globodera ellingtonae, discovered in Oregon and Idaho, reproduces well on potato but is not currently considered a quarantine pest. Identifying resistance to all three Globodera spp. would provide a valuable tool to manage these nematodes. Thirteen breeding lines and nine cultivars were evaluated in laboratories in Oregon, Idaho, and New York where the nematode populations are maintained. Minitubers or tissue culture plants were planted into pots and inoculated with eggs in replicated experiments. Results indicated that four entries had moderate to very high resistance to all three Globodera spp., while another four entries had high to very high resistance to two of the three Globodera spp. While major gene resistance is available for G. rostochiensis (H1), for G. pallida and G. ellingtonae it is largely unknown. Seven entries had comparable high resistance levels for G. rostochiensis and G. ellingtonae suggesting the possibility of common resistance genes. Resistance entries will be used for further crosses to develop and explore the basis of potato resistance to Globodera spp.