Genetic strategies to determine the mode of 2n egg formation in diploid potatoes View Full Text


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Article Info

DATE

1988-07

AUTHORS

D. S. Douches, C. F. Quiros

ABSTRACT

In this study, nineteen diploid potato clones (Solanum spp. 2n=2x=24) were identified as 2n egg producers on the basis of fruit set in 2x–4x crosses. The segregation of three genes mapped close to the centromere, Got-1 (1.1 cM), Pgm-2 (2.0 cM), and Sdh-1 (8.3 cM), were analyzed in the tetraploid offspring in these 2x–4x crosses to discriminate between First Division Restitution (FDR) and Second Division Restitution (SDR) modes of 2n egg formation. The co-dominant nature of these markers lead to more precise estimates of the recombinational frequencies as a result of completely classifying the segregating progenies. 2x–4x data revealed a predominance of SDR mechanisms occurring in 20 of the 21 families analyzed. With a SDR mode established, half-tetrad analysis (HTA) of four distal loci, 6-Pgdh-3, Mdh-1, Pgi-1, and Aps-1, revealed two SDR segregation patterns in some of the families. One pattern fit the expectations for the distal arm position. The gene-centromere map distances based upon SDR modes in the families following this pattern, were generally close to 4x−2x (FDR) estimates suggesting similar recombination rates between micro- and mega-sporogenesis. Heterozygosity transmission, on average, was 39.1%. In the other segregation pattern, in which the diploid parents were derived from S. chacoense PI 230580, higher than expected homozygosity levels were found in the female 2n gametophyte populations. A post-meiotic doubling of the reduced megaspore, which generates homozygous 2n eggs, is suggested to operate in three families. The common genetic background of the diploid clones suggested a heritable nature of this mechanism. Pooled data from these three deviant families calculated that 1.8% of the heterozygosity was transmitted to the tetraploid progeny. It is concluded that utilization of seven enzyme-coding loci, with previously established gene-centromere map distances, in 2x–4x crosses improved half-tetrad analysis (HTA) as a means to determine the mode of 2n gamete formation in megasporogenesis and megagametogenesis of diploid Solanum species. More... »

PAGES

247-260

References to SciGraph publications

  • 1981-07. Breeding value of 2n pollen diploid from hybrids and Phureja in 4x-2x crosses in potatoes in AMERICAN JOURNAL OF POTATO RESEARCH
  • 1969-05. Haploid induction in potato: Cytological basis for the pollinator effect in EUPHYTICA
  • 1985-11. The pattern of megasporogenesis and megagametogenesis in diploid Solanum species hybrids; its relevance to the origin of 2n-eggs and the induction of apomixis in EUPHYTICA
  • 1957-11. A Haploid Plant of the Potato Variety Katahdin in NATURE
  • 1978-11. Variation patterns of parthenogenetic plants derived from “unreduced” embryo-sacs of Solanum tuberosum subspecies andigena (Juz. et Buk.) Hawkes in THEORETICAL AND APPLIED GENETICS
  • 1975-02. Matromorphy in Brassica oleracea L. VII. Research on products of microsporogenesis and gametogenesis from prickle pollinated plants in EUPHYTICA
  • 1975-01. Breeding value of 2n pollen (diplandroids) in tetraploid x diploid crosses in potatoes in THEORETICAL AND APPLIED GENETICS
  • 1979-07. Gene-centromere mapping by 4x-2x matings in potatoes in THEORETICAL AND APPLIED GENETICS
  • 1974-02. Origin of Unreduced Embryo Sacs in Diploid Potatoes in NATURE
  • 1976-06. Genetic evidence for mode of 2n pollen formation andS-locus mapping in potatoes in POTATO RESEARCH
  • 1979-11. A re-examination of the mechanisms of 2n gamete formation in potato and its implications for breeding in EUPHYTICA
  • 1988-04. Genetic recombination in a diploid synaptic mutant and a Solanum tuberosum × S. chacoense diploid hybrid in HEREDITY
  • 1985-11. Updated listing of potato species names, abbreviations and taxonomic status in AMERICAN JOURNAL OF POTATO RESEARCH
  • 1975-11. Monohaploids (n=x=12) from autotetraploid Solanum tuberosum (2n=4x=48) through two successive cycles of female parthenogenesis in EUPHYTICA
  • 1977-12. Bilateral sexual polyploidization in potatoes in EUPHYTICA
  • 1977-03. The significance of 2N gametes in potato breeding in THEORETICAL AND APPLIED GENETICS
  • 1974-11. Matromorphy in Brassica oleracea L. IV. Formation of homozygous and heterozygous diploid products of gametogenesis and qualitative genetical research on matromorphic plants in EUPHYTICA
  • 1973-11. Use of experimental tetraploids in potato breeding in AMERICAN JOURNAL OF POTATO RESEARCH
  • Journal

    TITLE

    Euphytica

    ISSUE

    3

    VOLUME

    38

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf00023528

    DOI

    http://dx.doi.org/10.1007/bf00023528

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1052099059


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    35 schema:description In this study, nineteen diploid potato clones (Solanum spp. 2n=2x=24) were identified as 2n egg producers on the basis of fruit set in 2x–4x crosses. The segregation of three genes mapped close to the centromere, Got-1 (1.1 cM), Pgm-2 (2.0 cM), and Sdh-1 (8.3 cM), were analyzed in the tetraploid offspring in these 2x–4x crosses to discriminate between First Division Restitution (FDR) and Second Division Restitution (SDR) modes of 2n egg formation. The co-dominant nature of these markers lead to more precise estimates of the recombinational frequencies as a result of completely classifying the segregating progenies. 2x–4x data revealed a predominance of SDR mechanisms occurring in 20 of the 21 families analyzed. With a SDR mode established, half-tetrad analysis (HTA) of four distal loci, 6-Pgdh-3, Mdh-1, Pgi-1, and Aps-1, revealed two SDR segregation patterns in some of the families. One pattern fit the expectations for the distal arm position. The gene-centromere map distances based upon SDR modes in the families following this pattern, were generally close to 4x−2x (FDR) estimates suggesting similar recombination rates between micro- and mega-sporogenesis. Heterozygosity transmission, on average, was 39.1%. In the other segregation pattern, in which the diploid parents were derived from S. chacoense PI 230580, higher than expected homozygosity levels were found in the female 2n gametophyte populations. A post-meiotic doubling of the reduced megaspore, which generates homozygous 2n eggs, is suggested to operate in three families. The common genetic background of the diploid clones suggested a heritable nature of this mechanism. Pooled data from these three deviant families calculated that 1.8% of the heterozygosity was transmitted to the tetraploid progeny. It is concluded that utilization of seven enzyme-coding loci, with previously established gene-centromere map distances, in 2x–4x crosses improved half-tetrad analysis (HTA) as a means to determine the mode of 2n gamete formation in megasporogenesis and megagametogenesis of diploid Solanum species.
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