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Heterozygosity in 2n gametes of potato evaluated by RFLP markers
A Barone1, C Gebhardt, L Frusciante
1Research Centre for Vegetable Breeding, Via Universitá 113, 80055, Portici, Italy.
Summary
Potato polyploidization reveals significant differences in heterozygosity transmission via gametes. Specific gamete types (SDR vs. FDR) show distinct inheritance patterns, impacting tetraploid progeny.
Area of Science:
- Plant genetics
- Polyploidization studies
- Molecular markers
Background:
- Understanding heterozygosity transmission is crucial for polyploid breeding.
- Sexual polyploidization in potato involves diploid interspecific hybrids producing unreduced gametes.
- Segregation of markers in tetraploid progeny provides insights into gamete formation.
Purpose of the Study:
- To evaluate heterozygosity transmitted through 2n gametes in potato.
- To compare heterozygosity transmission via SDR (Somatic Diplotype Reduction) and FDR (First Division Dyad Reduction) gametes.
- To select tetraploid potato progeny with high heterozygosity levels.
Main Methods:
- Bilateral sexual polyploidization of diploid interspecific potato hybrids.
- Segregation analysis of Restriction Fragment Length Polymorphism (RFLP) markers.
- Estimation of recombination events and centromere positions using segregation ratios.
Main Results:
- 23 out of 84 RFLP probe/enzyme combinations showed polymorphism and heterozygosity.
- These markers identified 13 loci on five potato chromosomes.
- Heterozygosity transmission was 31.8% for SDR gametes and 71.4% for FDR gametes.
- Different recombination rates were observed between the two interspecific hybrids.
Conclusions:
- FDR gametes transmit significantly higher heterozygosity than SDR gametes in potato.
- RFLP marker analysis effectively characterizes heterozygosity and recombination in tetraploid progeny.
- The study provides valuable data for potato breeding programs utilizing polyploidization.
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