Abstract
Genera and species of Anthemideae can be distinguished on the basis of their nuclear ultrastructure (pattern of chromatin condensation, amount of heterochromatin) and their DNA composition (proportion of repetitive DNA). Anthemis species exhibit chromomeric to chromonematic nuclei with some small, but well distinguishable chromocenters. Anacyclus species show highly chromonematic nuclei with a cap-like distribution of the chromonemata; heterochromatin cannot be distinguished in ultrathin sections of Anacyclus nuclei. The melting point of nuclear DNA is similar in all species studied (about 85 °C, corresponding to about 38% GC). The fractions of repetitive DNA classes are different in all species, indicating a rapid diversification of the genome composition in Anthemideae. There are rather complex relationships between the species-specific degree of chromatin condensation, amount of heterochromatin, nuclear DNA content (2C value), and proportion of highly and intermediately repetitive DNA sequences.—It is suggested that nuclear ultrastructure and DNA composition may be used to characterize species and genera in sophisticated systematic and evolutionary studies.
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Fuhrmann, B., Nagl, W. (1979). Chromatin Organization and Repetitive DNA in Anacyclus and Anthemis (Asteraceae) . In: Nagl, W., Hemleben, V., Ehrendorfer, F. (eds) Genome and Chromatin: Organization, Evolution, Function. Plant Systematics and Evolution, vol 2. Springer, Vienna. https://doi.org/10.1007/978-3-7091-8556-8_19
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DOI: https://doi.org/10.1007/978-3-7091-8556-8_19
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