|Norby, Monica - UNIV OF WI - MADISON|
Submitted to: Proceedings American Society of Horticultural Sciences
Publication Type: Abstract Only
Publication Acceptance Date: April 12, 2005
Publication Date: July 10, 2005
Citation: Norby, M.J., Havey, M.J. 2005. Comparative mapping and introgression of late-blight resistance loci in solanum [Abstract]. Proceedings American Society of Horticultural Sciences. 40:998. Technical Abstract: The traditional source of late-blight resistance has been 6x[4 Endosperm Balance Number (EBN)] Solanum demissum, of which some are mapped (Figure 1). However, changes in the Phytophthora infestans virulence have rendered many of these resistance genes ineffective. Wild 2x(1EBN) Solanum species from Mexico and Central America have coevolved with P. infestans near its center of origin, thus making them potential sources of unique resistances. To date, three sources of late-blight resistance from 2x(1EBN) Solanum species have been identified and mapped, resistance from S. pinnatisectum to chromosome 7 (MGG 265:977-985), from S. bulbocastanum to chromosome 8 (TAG 101:697-704) and from S. mochiquense to chromosome nine (TAG 110:252-258) (Fig. 1). It is of interest to determine if the resistance genes are syntenic with unmapped and unique resistances from wild Solanum species. In this research, we evaluated the synteny between Rpi1 from S. pinnatisectum and R9 from S. demissum. It is now important to transfer this resistance to cultivated potato.