HAPLOIDY AND THE IDENTIFICATION OF SELF-INCOMPATIBILITY ALLELES IN CULTIVATED POTATO GROUPS

Publisher Website
Google Scholar
Abstract
Self-incompatibility was analyzed in 14 different Solanum tuberosum hybrid families obtained from crosses between Group Phureja of Stenotomum (2n=24) and a haploid (2n=24) of Group Tuberosum or Andigena. Five F1 families were resolved into 4 intra-incompatible, cross-compatible classes, indicating that the Tuberosum haploid and each sexual partner are S. allele heterozygotes having no S alleles in common. The detection of only 2 such classes in 5 other F1 families indicates that the same haploid has an S allele in common with each of 5 different Phureja clones. One F1 family from a cross between an Andigena haploid and a Phureja clone yielded only one incompatibility class. The restitution backcross progeny behaved in identical fashion. These results indicate that the parents have an S allele in common, and that the Andigena haploid is homozygous for this allele. The evidence presented substantiates the conclusion that the 24- and 48-chromosome forms of S. tuberosum have a similar self-incompatibility system. Haploidy could provide opportunities for investigation of incompatibility in other diploid and tetraploid Solanum species.