|Sieczka, Maria - MLOCHOW RES CTR, POLAND|
|Gawronska, Edyta - MLOCHOW RES. CTR., POLAND|
|Kazimierz, M - MLOCHOW RES. CTR., POLAND|
Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: March 15, 1999
Publication Date: December 15, 1999
Citation: SIECZKA, M.T., BROWN, C.R., GAWRONSKA, E., KAZIMIERZ, M.S. IDENTIFICATION OF POTATO RESISTANT TO NEW STRAINS OF LATE BLIGHT. AMERICAN JOURNAL OF POTATO RESEARCH. 76:384. 1999. Technical Abstract: Resistance to Phytophthora infestans has been evaluated in Polish and foreign cultivars reported to be resistant, and in diploid and tetraploid advanced selections obtained at Mlochow (in the breeding program for P. infestans resistance). In addition, segregation for P. infestans resistance was evaluated in three diploid and three tetraploid seedling families originated from parents differing in resistance level. In laboratory tests, two highly pathogenic strains of P. infestans were used: US 8 (A-2) and MP 322 (A-1), isolated in the U.S. and Poland, respectively. They exhibit similar pathogenicity to the evaluated potato genotypes. All material was evaluated simultaneously under high natural infection pressure. Among cultivars the highest level of foliar resistance was found in the Polish cv. Meduza and in the foreign cv. Cruza 148. Meduza was also resistant in tubers. Preliminary data indicates that among diploid and tetraploid selections/seedlings some were superior to cvs in both foliage and tuber resistance. Among them genotypes have been found with satisfactory tuber quality and, quite significantly, maturity earlier than the most resistant cultivars: Meduza and Cruza 148.