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  • Springer  (3)
  • 1990-1994  (3)
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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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  • 2
    Electronic Resource
    Electronic Resource
    Synaptic patterns of rye B chromosomes. I: The standard type (1993)
    Springer
    Chromosome research 1 (1993), S. 145-152 
    Details
    ISSN: 1573-6849
    Keywords: B-chromosomes ; meiosis ; rye ; synapsis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00710768
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  • 3
    Electronic Resource
    Electronic Resource
    B-chromosomes in inbred lines of rye (Secale cereale L.) (1994)
    Springer
    Genetica 92 (1994), S. 149-154 
    Details
    ISSN: 1573-6857
    Keywords: Secale cereale ; rye ; B-chromosomes ; fitness ; inbred lines ; parasitic Bs
    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 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00132533
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