Interspecific hybridization between the cultivated potato Solanum tuberosum subspecies tuberosum L. and the wild species S. circaeifolium subsp. circaeifolium Bitter exhibiting resistance to Phytophthora infestans (Mont.) de Bary and Globodera pallida (Stone) Behrens : 2. Sexual hybrids.

摘要: Crossability between the diploid species S. circaeifolium subsp. (crc) and other species, primarily tuberosum (tbr-2x), was studied. Forty-seven hybrids were obtained from crosses crc as female parent tbr-2x some series Tuberosa male parents. Of these 17% diploids; 83% triploids, probably carrying two genomes of crc. Female fertility sufficient to obtain offspring backcrosses with cultivated parent. Pollen stainability f1 varied, micro-pollen well unreduced pollen occurred. During meiosis diploids triploids a rather high proportion univalents found, in on average or three trivalents per cell found. All resistant Globodera pallida pathotypes 2 3, 75% tested genotypes highly Phytophthora infestans. Solanidine, tomatidine, tomatidenol, demissidine glycosides found tubers hybrids. Comparisons somatic are made. It is concluded that valuable Solanum can should be included potato breeding programs.