| Abstract: | Inheritance of resistance to Phytophthora infestans in the diploid Mexican species S. bulbocastanum and S. verrucosum appears to be quantitative. In these species there seems to be no clear distinction between a hypersensitive reaction to infection and one indicating a high degree of partial resistance. Sibbing or selfing apparently improves the degree of resistance in the progeny over that of the parents. S. verrucosum, a self-compatible species which shows little or no inbreeding depression after selfing, has especial advantages as a genetic tool and as a source of blight resistance, over S. bulbocastanum and other diploids.Contribution No. 119, Canada Dept. of Agriculture Research Station, Fredericton, New Brunswick, Canada |
