Abstract
The recombinant plasmid dpTa1 has an insert of relic wheat DNA that represents a family of tandemly organized DNA sequences with a monomeric length of approximately 340 bp. This insert was used to investigate the structural organization of this element in the genomes of 58 species within the tribe Triticeae and in 7 species representing other tribes of the Poaceae. The main characteristic of the genomic organization of dpTa1 is a classical ladder-type pattern which is typical for tandemly organized sequences. The dpTa1 sequence is present in all of the genomes of the Triticeae species examined and in 1 species from a closely related tribe (Bromus inermis, Bromeae). DNA from Hordelymus europaeus (Triticeae) did not hybridize under the standard conditions used in this study. Prolonged exposure was necessary to obtain a weak signal. Our data suggest that the dpTa1 family is quite old in evolutionary terms, probably more ancient than the tribe Triticeae. The dpTa1 sequence is more abundant in the D-genome of wheat than in other genomes in Triticeae. DNA from several species also have bands in addition to the tandem repeats. The dpTa1 sequence contains short direct and inverted subrepeats and is homologous to a tandemly repeated DNA sequence from Hordeum chilense.
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Communicated by P. M. A. Tigerstedt
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Vershinin, A., Svitashev, S., Gummesson, P.O. et al. Characterization of a family of tandemly repeated DNA sequences in Triticeae. Theoret. Appl. Genetics 89, 217–225 (1994). https://doi.org/10.1007/BF00225145
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DOI: https://doi.org/10.1007/BF00225145