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  • 1
    Digitale Medien
    Digitale Medien
    B-chromosomes in inbred lines of rye (Secale cereale L.) (1994)
    Springer
    Genetica 92 (1994), S. 149-154 
    Details
    ISSN: 1573-6857
    Schlagwort(e): Secale cereale ; rye ; B-chromosomes ; fitness ; inbred lines ; parasitic Bs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract B-chromosomes from an experimental population of the Japanese JNK strain of rye, isogenic for its Bs, have been backcrossed into twelve different inbred lines. The experiment provides a way to study the effects of the Bs against a range of homozygous A-chromosome backgrounds. This publication deals with vigour and fertility: it shows that the rye Bs fit a parasitic model, and that they interact in their effects with the A-chromosome background genotype.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00132533
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  • 2
    Digitale Medien
    Digitale Medien
    B-chromosomes in inbred lines of rye (Secale cereale L.) (1996)
    Springer
    Genetica 97 (1996), S. 65-72 
    Details
    ISSN: 1573-6857
    Schlagwort(e): Secale cereale ; rye ; B chromosomes ; inbred lines ; pairing ; pollen mitosis ; transmission genotypes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract B chromosomes from an experimental population of the Japanese JNK strain of rye, isogenic for its Bs, have been backcrossed into twelve different inbred lines. The experiment is a way of studying the effects of the Bs against a range of different homozygous A chromosome backgrounds. This publication deals with pairing effects of both the As and the Bs, and their interactions, and with pollen mitosis. At meiosis there is a genotypic component to B effects, and they do not appear to act solely through a physical disturbance within the nucleus. In pollen the Bs are always present in more than 50% of the grains regardless of their pairing behaviour during meiosis; this result fits with a ‘parasitic’ model of the activity of rye Bs.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00132582
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Synaptic patterns of rye B chromosomes. III. The deficient B (1994)
    Springer
    Chromosome research 2 (1994), S. 93-98 
    Details
    ISSN: 1573-6849
    Schlagwort(e): B chromosomes ; chromosomal pairing ; rye ; Secale cereale ; synapsis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Chromosomal pairing of a deficient B chromosome in rye has been studied by surface spreading of synaptonemal complexes in pollen mother cells from plants containing one deficient B (dB), one deficient B plus one standard B (dBstB) and one deficient B plus two standard Bs (dB2stB). Single dBs are often located peripherally in surface spread nuclei, and they under-go extensive non-homologous synapsis at pachytene. In the dBstB bivalents, homologous and non-homologous synapses occur simultaneously throughout pachytene without axial equalization. Competition for pairing between the dB and the two stBs results in a large predominance (80%) of stB bivalents. This finding is explained by the identical origin of the standard Bs and/or by the minor homology between the stB and the dB chromosomes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01553488
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  • 4
    Digitale Medien
    Digitale Medien
    Synaptic patterns of rye B chromosomes. I: The standard type (1993)
    Springer
    Chromosome research 1 (1993), S. 145-152 
    Details
    ISSN: 1573-6849
    Schlagwort(e): B-chromosomes ; meiosis ; rye ; synapsis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Chromosome pairing of standard B chromosomes (Bs) in rye has been studied by synaptonemal complex surface spreading of pollen mother cells containing from one to eight Bs. The main characteristics exhibited by the Bs are: (i) They are often located peripherally in surface spread nuclei and do not show presynaptic alignment. (ii) The period of pairing is delayed relative to that of the A set. (iii) Bs undergo extensive non-homol-ogous pairing at pachytene. (iv) The frequency of trivalents and quadrivalents in plants with 3Bs and 4Bs is about 66% following the expectations on the basis of random pairing among the short and the long arms with a single distal pairing initiation site per arm. Some quadrivalents containing two partner switches were observed, but on the same basis of randomness there was a deficiency of pachytene multivalents in plants with 5–8 Bs. The possible causes of the discrepancy between these observations are discussed. (v) There is a reduction in the frequency of multivalents between pachytene and metaphase I.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00710768
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