Submitted to: Proceedings Wisconsin Annual Potato Meetings
Publication Type: Proceedings
Publication Acceptance Date: 3/27/2001
Publication Date: N/A
Technical Abstract: Five hundred and forty-one selections were exposed to natural late blight infection in the field in an unrepheated trial. Of the 541 clones tested, 51 (9 percent) exhibited resistance. In a replicated trial involving 61 lines, previously showing resistance, 30 lines again showed some resistance. Evaluation of species clones and S. verrucosum-1EBN hybrids confirmed resistance. Some of the best resistance observed in families involving selections from PI 583334 (CIP 391137), a CIP horizontal resistant introduction. A late blight resistance locus from diploid (IEBN) Mexican Solanwnpinnatisectum was characterized and mapped. The diploid (IEBN) genetic map generated with 99 RFLPs revealed extensive synteny with previous published potato maps. A single dominant late blight resistance locus (Rpil) from S. pinnafisectwn was mapped to chromosome 7, a region previously unassociated with late blight resistance. Progress was made on cold chipping and french frying. Our best cold chipping parents were used to produce 38 new families with 2,223 progeny for cold chipping, and 2,196 progeny from 22 families for french fry studies which were grown this summer. These are being processed for chipping and french frying ability after being stored for three months at 34-36 degrees F. We have found some excellent fry materials among some of our enhancement lines having long shape. We already have tetraploid experimental materials that chip acceptably from 40-42 degrees F. We continue to be excited by the potential of this material and are encouraged by the progress being made.