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

Authors: Haynes, Kathleen; LAMBERT, DAVE - UNIVERSITY OF MAINE; CHRIST, BARBARA - PENNSYLVANIA STATE UNIV.; WEINGARTNER, D. - UNIVERSITY OF FLORIDA; DOUCHES, DAVID - MICHIGAN STATE UNIVERSITY; BACKLUND, JAN - UNIVERSITY OF MINNESOTA; SECOR, GARY - NORTH DAKOTA STATE UNIV.; FRY, WILLIAM - CORNELL UNIVERSITY; STEVENSON, WALTER - UNIVERSITY OF WISCONSIN

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: 6/13/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

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.