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  • 1
    Electronic Resource
    Electronic Resource
    Development-dependent inheritance of 5-azacytidine-induced epimutations in triticale: analysis of rDNA expression patterns (1997)
    Springer
    Chromosome research 5 (1997), S. 445-450 
    Details
    ISSN: 1573-6849
    Keywords: 5-azacytidine epimutations ; plant development ; rDNA expression ; triticale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genomic imprinting of rye origin rDNA sequences in triticale is modulated by DNA methylation responsible for ontogenic expression patterns of those sequences. Considering the dynamic nature of these phenomena, we evaluated the influence of plant development on the inheritance of modified rye rDNA expression patterns. DNA hypomethylation was induced in triticale by 5-azacytidine (5AC) treatments at distinct developmental stages of M1 plants, and expression patterns were analysed in M2. The activity of rye origin rRNA genes in progeny of untreated and 5AC-treated plants was evaluated by silver staining in meristematic root tip cells and in meiocytes at diplotene. In the progeny of 5AC-treated plants, a significant increase in rye rDNA expression was observed, contrasting with the residual activity in untreated plants. Significant differential effects of 5AC treatments were observed in M2 plants and correlated with the M1 plant developmental stage in which DNA hypomethylation was induced. Hypotheses to explain the origin of those differences are discussed here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018460828720
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Interphase arrangement of rye B chromosomes in rye and wheat (1997)
    Springer
    Chromosome research 5 (1997), S. 177-181 
    Details
    ISSN: 1573-6849
    Keywords: B chromosomes ; interphase chromosome arrangement ; meiosis ; Secale cereale ; Triticum aestivum cv. Lindstro¨m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Probes for B chromosome-specific sequences in the distal region of the long arm of the rye B have been used to investigate the interphase arrangement of the Bs in rye and in hexaploid wheat. The Lindstro¨m strain of wheat carries the rye Bs as additions. The number of in situ signals in nuclei with two, three and four Bs is often less than the maximum B number, and it seems that the Bs may be grouped together in various ways rather than being randomly dispersed throughout the nucleus. The degree of physical association is greater in rye than in the alien wheat background. The results are discussed in relation to the pairing and recombination preferences of the Bs in rye and in Lindstro¨m wheat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018442830112
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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