Ribosomal RNA genes in species of the Cynareae tribe (Compositae). I

By means of Southern blot hybridization, the structure of the ribosomal DNA in six species of the Cynareae tribe has been analyzed. Artichoke and wild artichoke possess only one type of ribosomal genes 13 kb long; Onopordum acanthium has at least two types of rDNA repeats 9.9 kb and 10.3 kb long and...

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Bibliographic Details
Published in:Protoplasma 1986-01, Vol.132 (1/2), p.76-84
Main Authors: Tucci, G.F, Maggini, F
Format: Article
Language:English
Subjects:
Biological and medical sciences
chromosome mapping
Cynara cardunculus
Fundamental and applied biological sciences. Psychology
genes
Genes. Genome
Molecular and cellular biology
Molecular genetics
ribosomes
RNA
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Summary:By means of Southern blot hybridization, the structure of the ribosomal DNA in six species of the Cynareae tribe has been analyzed. Artichoke and wild artichoke possess only one type of ribosomal genes 13 kb long; Onopordum acanthium has at least two types of rDNA repeats 9.9 kb and 10.3 kb long and O. illyricum has a third gene type 9.7 kb long; in Galactites tomentosa there are at least four ribosomal gene types of 10.9, 11.6, 11.5, and 10 kb; Carduus nutans possesses two ribosomal gene types of the same length of 12.5 kb that vary in the nucleotide sequence of the external spacer. The rRNA genes of all the species studied have an identical restriction mapping in the 18S and 25S regions, differences in length and/or nucleotide sequence are present in the external spacer.
ISSN:0033-183X
1615-6102
DOI:10.1007/BF01275793