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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 63 (1982), S. 177-181 
    ISSN: 1432-2242
    Keywords: Cytogenetics ; Interspecific hybrid ; Nicotiana debneyi ; N. umbratica ; Colchiploids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Interspecific F1 hybrids of Nicotiana debneyi Domin (2n=48) and N. umbratica Burbidge (2n=46), both belonging to the section Suaveolentes, showed a high degree of meiotic chromosome pairing. Two of the five F2 plants obtained exhibited chromosome mosaicism. The first colchiploid generation (C1) had the expected chromosome number of 2n=94 while C2 showed 2n=88, a loss of three pairs of chromosomes. This same chromosome number continued in further colchiploid generations, followed up to C5, except for a few plants in C3 which showed chromosome mosaicism. The F1 phenotype was stable through C1 to C5 and fertility was normal in colchiploids through all generations in spite of the loss of three pairs of chromosomes and chromosome mosaicism. This stability and fertility apparently reflect the tolerance of the genomes to the genetic adjustment of chromosome complements which is believed to be associated with the originally polyploid nature of the parental species and the chromosome doubling brought about in the amphidiploids.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 119 (1984), S. 15-19 
    ISSN: 1573-5117
    Keywords: Pistia stratiotes ; population biology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Populations of Pistia stratiotes L., a pleustonic macrophyte, have been surveyed in two ponds of different hydrochemical nature. Based on the rosette form, two biotypes were distinguished. They are provisionally designated as ‘Compact’ and ‘loose’ varieties. They occur as sympatric populations in the ponds. A comparison of the diameter of the rosette, root length, 5th leaf length & breadth and length & number of inflorescences, followed by tests of significance, confirm their distinctiveness. In vegetative propagation, they propagate true. The comparison of the biotypes is extended to biomass, productivity allocation, pH of the cell saps, chlorophyll, nucleic acids, total free amino acid (TNPS) content of the leaves and total nitrogen, crude protein and phosphorous in whole plants.
    Type of Medium: Electronic Resource
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