This thesis describes the selection and evaluation of diploid potato clones (2n=2x=24) that produce unreduced or 2n-gametes with 24 chromosomes instead of the normal reduced n-gametes with 12 chromosomes. To elucidate the modes of origin of the 2n-gametes, the progenies derived from such gametes were analysed for different marker loci of one chromosome. Besides the already known mechanisms of First and Second Division Restitution (FDR and SDR) in potato, the multilocus analysis showed the additional mechanism of Post-Meiotic Restitution (PMR) resulting in completely homozygous 2n-gametes. The FDR and SDR 2n-gametes were used for gene-centromere mapping. Multilocus analysis of SDR 2n-gametes showed the map position of the centromere of chromosome 8 in relation to the RFLP-loci. These genetic analyses also demonstrated the occurrence of a single crossover per chromosome arm (high level of chiasma interference). In the light of these findings, it is possible to construct more critical genetic maps of potato.
|Qualification||Doctor of Philosophy|
|Award date||8 Oct 1997|
|Place of Publication||S.l.|
|Publication status||Published - 1997|
- plant breeding
- solanum tuberosum