Postmeiotic restitution in 2n-egg formation of diploid potato View Full Text


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Article Info

DATE

1998-07

AUTHORS

Heleen J M Bastiaanssen, Petra M M M Van Den Berg, Pim Lindhout, Evert Jacobsen, M S Ramanna

ABSTRACT

Four diploid (2n=2x=24) interspecific F1 hybrids of tuberous Solanum species were tested for the modes of origin of 2n-eggs. The four hybrids were heterozygous for the genetic marker amylose-free starch (Amf/amf) on chromosome 8. By crossing these hybrids with tetraploid S. tuberosum parents (2n=4x=48) that were nulliplex for this marker, i.e. Amf/amf×amf/amf/amf/amf crosses, tetraploid progenies were generated and classified for starch phenotypes of microspores. Based on the segregation of the amf marker gene, the tetraploid progenies were classified into nulliplex, simplex and duplex genotypes. In the progenies of three F1 hybrids, the simplex genotypes predominated and the origin of 2n-eggs could be explained as the result of second division restitution (SDR). But in the progeny of one F1 hybrid (a S. microdontum×S. tuberosum hybrid), there were only nulliplex and duplex genotypes, indicating complete homozygosity of the 2n-eggs (Amf/Amf or amf/amf) for this locus. In order to genotype the 2n-eggs also for other loci on the same chromosome, a tetraploid progeny was generated from a cross between this hybrid and a tetraploid S. tuberosum parent (Tetra 4) and analysed for four RFLP loci on chromosome 8. This analysis showed that all 2n-eggs of the S. microdontum×S. tuberosum hybrid were homozygous for all four loci, as was observed for the amf locus. From the same analysis it was evident that crossovers had occurred between the two genomes of this F1 hybrid. These homozygous and recombinant genotypes indicated that the 2n-eggs had originated from the doubling of the chromosome number in the normal haploid products of meiosis. Following the terminology of first and second division restitution (FDR and SDR), this new mode of origin of 2n-eggs in diploid potato is called post-meiotic restitution (PMR). More... »

PAGES

20

References to SciGraph publications

  • 1989-11. Phenotypic and genotypic characterization of an amylose-free starch mutant of the potato in EUPHYTICA
  • 1987-12. Frequency and mechanisms of 2n egg formation in haploid tuberosum-wild species F1 hybrids in AMERICAN JOURNAL OF POTATO RESEARCH
  • 1991-03. Introduction of an amylose-free (amf) mutant into breeding of cultivated potato, Solanum tuberosum L. in EUPHYTICA
  • 1961-11. Problems in breeding and cytology of sugar cane in EUPHYTICA
  • 1973-06. Selection from Solanum tuberosum group phureja of genotypes combining high-frequency haploid induction with homozygosity for embryo-spot in EUPHYTICA
  • 1996-11. Pollen markers for gene-centromere mapping in diploid potato in THEORETICAL AND APPLIED GENETICS
  • 1979-07. Gene-centromere mapping by 4x-2x matings in potatoes in THEORETICAL AND APPLIED GENETICS
  • 1991-01. Cytological evidences of SDR-FDR mixture in the formation of 2n eggs in a potato diploid clone in THEORETICAL AND APPLIED GENETICS
  • 1987-01. Morphology and vigour of monohaploid potato clones, their corresponding homozygous diploids and tetraploids and their heterozygous diploid parent in EUPHYTICA
  • 1988-07. Genetic strategies to determine the mode of 2n egg formation in diploid potatoes in EUPHYTICA
  • 1993-02. Isolation and characterization of potato diploid clones generating a high frequency of monohaploid or homozygous diploid androgenetic plants in THEORETICAL AND APPLIED GENETICS
  • 1995-07. Heterozygosity in 2n gametes of potato evaluated by RFLP markers in THEORETICAL AND APPLIED GENETICS
  • 1983-06. First division restitution gametes through fertile desynaptic mutants of potato in EUPHYTICA
  • Journal

    TITLE

    Heredity

    ISSUE

    1

    VOLUME

    81

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1046/j.1365-2540.1998.00370.x

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    http://dx.doi.org/10.1046/j.1365-2540.1998.00370.x

    DIMENSIONS

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    30 schema:description Four diploid (2n=2x=24) interspecific F1 hybrids of tuberous Solanum species were tested for the modes of origin of 2n-eggs. The four hybrids were heterozygous for the genetic marker amylose-free starch (Amf/amf) on chromosome 8. By crossing these hybrids with tetraploid S. tuberosum parents (2n=4x=48) that were nulliplex for this marker, i.e. Amf/amf×amf/amf/amf/amf crosses, tetraploid progenies were generated and classified for starch phenotypes of microspores. Based on the segregation of the amf marker gene, the tetraploid progenies were classified into nulliplex, simplex and duplex genotypes. In the progenies of three F1 hybrids, the simplex genotypes predominated and the origin of 2n-eggs could be explained as the result of second division restitution (SDR). But in the progeny of one F1 hybrid (a S. microdontum×S. tuberosum hybrid), there were only nulliplex and duplex genotypes, indicating complete homozygosity of the 2n-eggs (Amf/Amf or amf/amf) for this locus. In order to genotype the 2n-eggs also for other loci on the same chromosome, a tetraploid progeny was generated from a cross between this hybrid and a tetraploid S. tuberosum parent (Tetra 4) and analysed for four RFLP loci on chromosome 8. This analysis showed that all 2n-eggs of the S. microdontum×S. tuberosum hybrid were homozygous for all four loci, as was observed for the amf locus. From the same analysis it was evident that crossovers had occurred between the two genomes of this F1 hybrid. These homozygous and recombinant genotypes indicated that the 2n-eggs had originated from the doubling of the chromosome number in the normal haploid products of meiosis. Following the terminology of first and second division restitution (FDR and SDR), this new mode of origin of 2n-eggs in diploid potato is called post-meiotic restitution (PMR).
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