Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: June 13, 1997
Publication Date: N/A
Resistance to early blight in diploid potatoes was shown to be highly heritable and readily transmitted to the tetraploid level via 4x-2x crosses. Resistant selections from this 4x-2x population were allowed to intermate. This report investigates the general and specific combining ability for resistance to early blight for five early blight resistant selections from these populations with four different male parents in a design II mating scheme to generate 16 families. Approximately 20 randomly chosen offspring per family were evaluated for early blight resistance in 1995 and 1996 in a randomized complete block design in PA. In 1995 and 1996, mean area under disease progress curve (AUDPC) among the 16 families ranged from 159 to 483 and from 464 to 940, respectively. There were significant differences among female parents and male parents for AUDPC, indicating the importance of general combining ability for early blight resistance in this germplasm. The female x male source of variation was not significant, indicating that specific combining ability is not important. The best early blight resistance was observed in families where both parents were derived from the early blight resistant population.