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  • 1
    Electronic Resource
    Electronic Resource
    Barriers to hybridization of Solanum bulbocastanum Dun. and S. Verrucosum Schlechtd. and structural hybridity in their F1 plants (1976)
    Springer
    Euphytica 25 (1976), S. 1-10 
    Details
    ISSN: 1573-5060
    Keywords: Solanum ; interspecific hybridization ; structural hybridity ; unilateral inhibition ; sterility ; pollen tube growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Results of reciprocal crosses between Solanum verrucosum (2n=2x=24) and S. bulbocastanum (2n=2x=24) are described in terms of pollen tube behaviour in styles, of berry and seed set, of fertility and of meiotic behaviour of the F1 hybrids. Pollen tube growth of S. verrucosum is strongly inhibited in styles of S. bulbocastanum, whereas no inhibition is observed in the reciprocal cross. Therefore S. bulbocastanum x S. verrucosum fails to set berries or seeds, whereas the reciprocal cross produces both berries (54.4% berry set) and seeds (0.3 per berry). Only 14.6% of the seeds germinate. Both the diploid and corresponding tetraploid hybrid plants are vigorous, flower abundantly, have a rather regular meiosis (mainly rod bivalents), but show a high degree of cytoplasmic-genic male sterility. Crossability of the diploid hybrid plants is nil when used as pollen parents and near to zero when used as pistillate parents. The barriers to hybridization of the parent species (unilateral inhibition of pollen tube growth, somatoplastic sterility, cytoplasmic-genic male sterility and structural differences of the parental chromosomes) are discussed and methods are suggested to overcome these barriers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041523
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  • 2
    Electronic Resource
    Electronic Resource
    Gene transfer from non-tuberous to tuberous Solanum species: Evidence from meiosis in hybrids (1982)
    Springer
    Euphytica 31 (1982), S. 565-572 
    Details
    ISSN: 1573-5060
    Keywords: Solanum ; potato ; gene transfer ; interspecific hybridization ; meiosis ; chromosome doubling ; non-tuberous
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The distant hybrids between non-tuberous Solanum species and tuberous S. pinnatisectum display little or no pairing in F1 and predominantly bivalent formation (preferential pairing) after chromosome doubling. In such a situation the question about the potential and extent of gene transfer from the non-tuberous parent to the tuberous one is relevant to potato breeding. This question was investigated by studying meiosis in triploid and hexaploid hybrids from crosses between diploid TV5 x tetraploid (S. etuberosum x S. pinnatisectum). TV5 is similar to S. verrucosum with cytoplasm of S. tuberosum. The following evidence was found for the desirable transfer of S. etuberosum genes to the tuberous species. The triploid F1 hybrids did not display the configurations 12 II+12 I expected if no gene exchange would take place between S. etuberosum and the tuberous species; however, a considerable number of multivalents per cell was observed in all plants studied. In the hexaploid F1 hybrids, obtained from the triploids through somatic doubling in vitro, 36 bivalents could reasonably be expected. Although bivalents were predominant (an overall average of 24.2 per cell) quite a few chromosomes were associated as multivalents in all plants investigated. It is concluded that in the hybrids studied a considerable amount of pairing and chiasma formation occurs between chromosomes of non-tuberous and those of tuberous Solanum species. This pairing affinity is larger than that found in 2x and 4x hybrids from S. etuberosum x S. pinnatisectum. Some hypotheses are put forward to explain this increased pairing affinity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00039194
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  • 3
    Electronic Resource
    Electronic Resource
    Unique meiotic behaviourin F1 plants from a cross between a non-tuberous and a tuberous Solanum species in section Petota (1979)
    Springer
    Euphytica 28 (1979), S. 9-15 
    Details
    ISSN: 1573-5060
    Keywords: Meiosis ; interspecific hybridization ; chromosomal differentiation ; parallel spindles ; Solanum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Uniformly abnormal meiotic behaviour was observed in 12 F1-plants from a cross between Solanum etuberosum (non-tuberous) and S. pinnatisectum (tuberous). Per pollen mother cell at MI an average was found of 3.64 bivalents (all rodshaped, 1–2 per cell, heteromorphic), 16.64 univalents (scattered haphazardly on a continuous bipolar spindle) and 0.03 trivalents (all Y-shaped). Lagging chromosomes and precocious division of univalents very frequently occurs, leading to unequal distribution of chromosomes, aneuploid gametes and male sterility. Heteromorphic bivalents at MI, loops in bivalents at pachytene and non-disjunction in one hybrid plant, point to a highly abnormal meiotic behaviour. The occurrence of few trivalents is discussed. Considering that according to the literature nearly normal pairing was observed in the intergeneric F1-hybrids Lycopersicon esculentum × Solanum lycopersicoides and L. esculentum x S. pennellii, the lack of chromosome pairing in an interspecific F1-hybrid, of which both Solanum parents belong to the same section, is paradoxical to a plant breeder and might even be conspicuous to a taxonomist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029167
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  • 4
    Electronic Resource
    Electronic Resource
    Chromosome doubling through adventitious shoot formation on in vitro cultivated leaf explants from diploid interspecific potato hybrids (1981)
    Springer
    Euphytica 30 (1981), S. 239-246 
    Details
    ISSN: 1573-5060
    Keywords: Solanum ; potato ; explant culture ; interspecific hybrid ; adventitious shoots ; in vitro ; chromosome doubling ; solid mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nearly 450 plantlets were produced from 51 diploid Solanum etuberosum x S. pinnatisectum F1 hybrids through adventitious shoot formation on in vitro cultivated rachis and petiole explants. On the basis of phenotypical assessment of the ploidy level of 425 plants, 84.7% of the plants were scored as doubled or doubled twice. A cytological analysis of ploidy in the three layers L1.L2 and L3 of 112 plants revealed 83.9% complete doubling: periclinal ploidy chimeras were not found and only two sectorial ploidy chimeras were detected. Doubled plants were obtained from all 51 clones. Various flower colours and epinastic leaves (in 1 clone) may be indications of mutagenesis through the treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033983
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