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  • 1
    Electronic Resource
    Electronic Resource
    Synaptic patterns of rye B chromosomes. II. The effect of the standard B chromosomes on the pairing of the A set (1993)
    Springer
    Theoretical and applied genetics 87 (1993), S. 17-21 
    Details
    ISSN: 1432-2242
    Keywords: Rye ; B chromosomes ; Synapsis ; Interlocking ; Non-homologous pairing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In order to elucidate the possible effects of rye B chromosomes (Bs) on synapsis and metaphase-I associations of the A set, a comparative study between pachytene and metaphase-I-cells of rye plants carrying different numbers of Bs (0–8) has been carried out. The number of Bs was found to be positively correlated with the frequency of synaptic irregularities of the A set, i.e. multivalents and foldback pairing, and with the frequency of pachytene interlockings. It is proposed that interlockings are the origin of these irregularities because both appeared in close proximity in many nuclei. Examples of A-B pairing are described. The frequency of synaptic abnormalities seems to be unrelated to the mean of A chromosome-bound arms at metaphase I.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223737
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    B-chromosomes in inbred lines of rye (Secale cereale L.) (1996)
    Springer
    Genetica 97 (1996), S. 65-72 
    Details
    ISSN: 1573-6857
    Keywords: Secale cereale ; rye ; B chromosomes ; inbred lines ; pairing ; pollen mitosis ; transmission genotypes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00132582
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synaptic patterns of rye B chromosomes. III. The deficient B (1994)
    Springer
    Chromosome research 2 (1994), S. 93-98 
    Details
    ISSN: 1573-6849
    Keywords: B chromosomes ; chromosomal pairing ; rye ; Secale cereale ; synapsis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01553488
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    Paper (German National Licenses)
    Fulltext
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