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  • 1
    Electronic Resource
    Electronic Resource
    Effect of environment and direction of hybridization on genetic variability in two diploid potato populations (1988)
    Springer
    Potato research 31 (1988), S. 247-256 
    Details
    ISSN: 1871-4528
    Keywords: Solanum phureja ; dihaploid ; yield ; heterosis ; combining ability ; Solanum tuberosum ; reciprocal differences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Twelve selections from each of theSolanum tuberosum Groups haploid Tuberosum and Phureja were intercrossed in a NC Design II pattern to generate reciprocal hybrids. Yield parameters, combining ability and variance components were estimated from field experiments conducted at three locations, one in Minnesota and two in Morocco. Heterosis for yield and tuber number was significant at all locations, but only in Tuberosum cytoplasm. Estimates of general combining ability (GCA) for Tuberosum parents and specific combining ability (SCA) for Tuberosum-Phureja combinations varied with location and direction of hybridization. GCA of Phreja parents, however, was consistently significant at all locations and in both cytoplasms. Genetic variance estimates revealed predominantly non-additive gene action for most traits. Environment and direction of hybridization significantly influenced estimates, of variance components, indicating that hybrid performance should be evaluated in both cytoplasms and in the target environments for effective utilization of this germplasm in future breeding efforts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02365533
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  • 2
    Electronic Resource
    Electronic Resource
    Reciprocal differences between hybrids of Solanum tuberosum Groups Tuberosum (haploid) and Phureja (1987)
    Springer
    Euphytica 36 (1987), S. 631-639 
    Details
    ISSN: 1573-5060
    Keywords: Solanum tuberosum ; potato ; Solanum tuberosum Group Phureja ; dihaploid ; cytoplasmic inheritance ; reciprocal difference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Yield components including total tuber yield, total tuber number, vine maturity, vine vigor and average tuber weight as well as seed germination and pollen stainability were studied in 28 exact reciprocal hybrid families, between 12 Solanum tuberosum Group Tuberosum (haploid) (TH) and 12 S. tuberosum Group Phureja (PH) clones in a NC Mating Design II in 4 sets of 3 by 3 reciprocal hybrids at three locations, one in Minnesota (USA) and two in Morocco. TH parents were insensitive to daylength whereas most PH clones required critical photoperiods equal to or less than 14 hours for tuberization. Mean reciprocal differences were significant for most traits at all 3 locations. Hybrids with TH cytoplasm were superior to those with PH cytoplasm by 18% for tuber yield, 21% for tuber number, and 9% for vine maturity, but inferior to hybrids with PH cytoplasm by 11% for vine vigor and 19% for time to reach 80% seed germination. Reciprocal differences were not detected for average tuber weight. Six reciprocal crosses revealed significant differences for pollen stainability but the overall mean difference (one location) was not significant. Possible reasons for the observed reciprocal differences included gamete selection, pseudo-self-compatibility and/or interaction of cytoplasm with both nuclear genes and environment. Differences for critical photoperiod of TH and PH parents were also demonstrated as a probable source of reciprocal differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041513
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  • 3
    Electronic Resource
    Electronic Resource
    Breeding behavior of yield components and hollow heart in tetraploid-diploid vs. conventionally derived potato hybrids (1981)
    Springer
    Euphytica 30 (1981), S. 547-561 
    Details
    ISSN: 1573-5060
    Keywords: Solanum tuberosum ; Solanum phureja ; potato ; unreduced gametes ; first division restitution ; 4x-2x hybrids ; hollow heart ; yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A factorial mating design with six 4x cultivars as stylar parents mated to three groups of pollen parents (4x cultivars, 4x high protein selections, and 2x S. phureja) was used to study breeding behavior of yield, tuber set, marketable yield and hollow heart in potatoes. Mean yield for the 4x-2x hybrids was equivalent to that of their cultivar parents although yield components, tuber set and average tuber size, were greater and less, respectively, than the cultivar parents. High estimates of general combining ability were found in both pollen and stylar parents for yield, tuber set, marketable yield, number of marketable tubers and hollow heart in all three hybrid populations. Specific combining ability estimates were significant only for yield and hollow heart. Frequency of white-fleshed 4x-2x progeny of five heterozygous yellow-fleshed 2x phureja genotypes was used to confirm cytological identification of a first division restitution mechanism operative in the 2x parents. Although three of these phureja genotypes generated high-yielding progeny, two others produced 4x-2x progeny with mean yield similar to that of hybrids among 4x cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00038781
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  • 4
    Electronic Resource
    Electronic Resource
    Breeding behavior for tuber protein in Solanum tuberosum and Tuberosum-phureja hybrids (1981)
    Springer
    Euphytica 30 (1981), S. 563-577 
    Details
    ISSN: 1573-5060
    Keywords: Solanum tuberosum ; Solanum phureja ; potato ; potato protein ; tuber protein ; 4x-2x hybrids ; first division restitution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary True protein content among tubers within a plant of Solanum tuberosum cv. Oneida was found to be negatively correlated with tuber size. A similar study of S. phureja genotype 148-17 revealed no correlation. Tuber protein was determined for 250 genotypes in each of four hybrid potato populations in a factorial mating design with four potato cultivars as stylar parents mated to four groups of pollen parents (4x cultivars, 4x high protein selections, 2x S. phureja, 2x high protein S. phureja). The hybrid population derived from the 4x high protein selections was significantly higher in protein content than the other populations. High estimates of general combining ability for tuber protein content were found for both stylar and pollen parents. Poor photoperiodic adaptation to growing conditions in northern latitudes was a possible explanation for the variable protein phenotypes typical of S. phureja and the lack of transmission of the high protein character in phureja to 4x-2x hybrids. Although protein content was negatively correlated with total yield, high protein segregates with good yield potential were identified in all four populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00038782
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