TY - JOUR
T1 - Phenotypic stability of resistance to late blight in potato clones evaluated at eight sites in the united states
AU - Haynes, K. G.
AU - Lambert, D. H.
AU - Christ, B. J.
AU - Weingartner, D. P.
AU - Douches, D. S.
AU - Backlund, J. E.
AU - Secor, G.
AU - Fry, W.
AU - Stevenson, W.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 1998
Y1 - 1998
N2 - Changes in the fungal pathogen Phytophthora infestans in the United States pose a significant threat to potato production. Sources of resistance to these new genotypes of P. infestans need to be identified for potato breeders to have parental materials for crossing, and the phenotypic stability of late blight resistance in these potato clones needs to be determined. Sixteen potato clones which reportedly have some resistance to late blight were evaluated at eight locations: Florida (FL), Maine (ME), Michigan (MI), Minnesota (MN), North Dakota (ND), New York (NY), Pennsylvania (PA) and Wisconsin (WI) in 1996. Percent infected foliage was recorded at approximately weekly intervals following the onset of the disease at each location. Area under the disease progress curve (AUDPC) was calculated. Clones were ranked for mean AUDPC within location and the nonparametric stability statistics, mean absolute rank differences and variance of the ranks, were analyzed for phenotypic stability. Neither of these statistics was significant, indicating a lack of genotype x environment interaction on the rankings of these clones across locations in 1996. The four clones with lowest AUDPC scores were U.S. clones AWN86514-2, B0692-4, B0718-3 and B0767-2. These clones should be useful parental materials for breeders seeking to incorporate genes for late blight resistance into potatoes.
AB - Changes in the fungal pathogen Phytophthora infestans in the United States pose a significant threat to potato production. Sources of resistance to these new genotypes of P. infestans need to be identified for potato breeders to have parental materials for crossing, and the phenotypic stability of late blight resistance in these potato clones needs to be determined. Sixteen potato clones which reportedly have some resistance to late blight were evaluated at eight locations: Florida (FL), Maine (ME), Michigan (MI), Minnesota (MN), North Dakota (ND), New York (NY), Pennsylvania (PA) and Wisconsin (WI) in 1996. Percent infected foliage was recorded at approximately weekly intervals following the onset of the disease at each location. Area under the disease progress curve (AUDPC) was calculated. Clones were ranked for mean AUDPC within location and the nonparametric stability statistics, mean absolute rank differences and variance of the ranks, were analyzed for phenotypic stability. Neither of these statistics was significant, indicating a lack of genotype x environment interaction on the rankings of these clones across locations in 1996. The four clones with lowest AUDPC scores were U.S. clones AWN86514-2, B0692-4, B0718-3 and B0767-2. These clones should be useful parental materials for breeders seeking to incorporate genes for late blight resistance into potatoes.
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U2 - 10.1007/bf02854215
DO - 10.1007/bf02854215
M3 - Article
AN - SCOPUS:0031714672
SN - 0003-0589
VL - 75
SP - 211
EP - 217
JO - American Journal of Potato Research
JF - American Journal of Potato Research
IS - 5
ER -