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Title: PHENOTYPIC STABILITY OF POTATO CLONES EVALUATED FOR RESISTANCE TO LATE BLIGHT AT EIGHT SITES IN THE UNITED STATES

Authors
item Haynes, Kathleen
item Lambert, Dave - UNIVERSITY OF MAINE
item Christ, Barbara - PENNSYLVANIA STATE UNIV.
item Weingartner, D. - UNIVERSITY OF FLORIDA
item Douches, David - MICHIGAN STATE UNIVERSITY
item Backlund, Jan - UNIVERSITY OF MINNESOTA
item Secor, Gary - NORTH DAKOTA STATE UNIV.
item Fry, William - CORNELL UNIVERSITY
item Stevenson, Walter - UNIVERSITY OF WISCONSIN

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: June 13, 1997
Publication Date: N/A

Technical Abstract: Seventeen potato clones which reportedly had some resistance to late blight, caused by Phytophthora infestans, were evaluated at eight locations (ME, PA, FL, MI, MN, ND, NY and WI) in the United States 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 locations and the nonparametric stability statistics mean absolute rank differences and variance of the ranks were analyzed for phenotypic stability. Neither of these statistics were 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 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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