|Love, S - UNIV IDAHO, ABERDEEN, ID|
|Salaiz, T - UNIV IDAHO, ABERDEEN, ID|
|Pavek, J - UNIV IDAHO, ABERDEEN, ID|
Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: April 15, 2001
Publication Date: December 15, 2001
Citation: LOVE, S.L., SALAIZ, T.A., PAVEK, J.J., BROWN, C.R. DEVELOPMENT OF RUSSET TYPE GERMPLASM WITH RESISTANCE TO CORKY RINGSPOT. AMERICAN JOURNAL OF POTATO RESEARCH. 78:476. 2001. Technical Abstract: Corky ringspot (CRS), caused by tobacco rattle virus and vectored by stubby root nematodes (Trichodorus sp.), is rapidly becoming a widespread problem in the northwestern U.S. Genes for resistance are present in many European and a few older North American cultivars. No consistent effort has been made to develop resistance in the russet-type cultivars that are predominant in Northwest potato production. This report summarizes eleven years of research to develop russet type germplasm with resistance to CRS. Initial screening of existing USDA-ARS (Aberdeen) germlasm identified two corky ringspot resistant clones, A72630-9 with resistance derived from Bintje and A77567-7 with resistance derived from Multa. Both resulted from crosses between CRS resistant and russet skinned parents. A cross between the A72630-9 and A775687-7 produced A8259-5, a clone with russet skin, oblong shape, yellow flesh, and a high level of CRS resistance. Screening of additional USDA-ARS germplasm identified other sources of resistance, including AC Brador and progeny of Fianna (NZA8904-2), PI407415 (A77715-6), Ukama (A89875-5), S. andigena (A8793-6), and complex Polish germplasm (A90586-11). These resistant clones were hybridized with russet parents and 105 progeny clones screened at Egin, ID and Pasco, WA from 1992-2000. Twelve clones with russet parentage have been identified as having high levels of resistance to CRS, combined with good adaptation. Six of these clones have oblong to long shape and russet skin and will be important for developing new cultivars with CRS resistance in combination with russet- type appearance and quality characteristics.