|Porter, L. - UNIV OF ID, ABERDEEN|
|Miller, J. - UNIV OF ID, ABERDEEN|
Submitted to: American Journal of Potato Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: August 8, 2004
Publication Date: January 1, 2005
Citation: Novy, R.G., Porter, L.D., Miller, J.S. 2005. Identification of Solanum tuberosum Gp. Andigena Clones Having Both Foliar and Tuber Resistance to Late Blight. American Journal of Potato Research. 82 (1):85. Technical Abstract: Breeding strictly for foliar resistance to late blight without subsequent effort in tuber resistance has the potential to exacerbate tuber infection. Wild potato species can be valuable sources of foliar and tuber blight resistance. However, most species are difficult to sexually hybridize with cultivated potato without the use of 2n gametes or ploidy manipulations. Solanum tuberosum Group Andigena is closely related to cultivated potato (S. tuberosum Group Tuberosum) and is a recognized source of foliar late blight resistance and may be a source of tuber blight resistance as well. Able to be readily hybridized with cultivated potato, Andigena could prove useful in developing late blight resistant potato varieties. Five hundred and thirteen plants representing 13 Andigena accessions were tested for foliar resistance to late blight using a detached leaf assay. Variability in foliar resistance was observed among clones with a range of 0 – 95% of leaf tissue displaying late blight symptoms seven days following inoculation with sporangia. Thirteen percent (69 clones) were identified as highly resistant to late blight with <10% diseased tissue, with an additional 49% (249 clones) displaying 11-40% diseased tissue. Tubers from Andigena clones exhibiting foliar resistance were screened in 2003 and 2004 for resistance using a laboratory inoculation assay. Andigena individuals were identified that expressed high levels of resistance to P. infestans in both foliage and tuber. These individuals will be tested in 2004 at late blight screening sites in OR and ID to confirm that the foliar and tuber resistances identified in laboratory screenings are expressed under field conditions.