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  • 1
    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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    Paper (German National Licenses)
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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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    Paper (German National Licenses)
    Fulltext
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