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  • 1
    Electronic Resource
    Electronic Resource
    Evolution and Molecular Biology of Luteoviruses (1990)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Phytopathology 28 (1990), S. 341-363 
    Details
    ISSN: 0066-4286
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.py.28.090190.002013
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  • 2
    Electronic Resource
    Electronic Resource
    The Ds1 controlling element family in maize andTripsacum (1987)
    Springer
    Journal of molecular evolution 26 (1987), S. 329-334 
    Details
    ISSN: 1432-1432
    Keywords: Maize ; Ac ; Ds ; Controlling elements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Hybridization experiments indicated that the maize genome contains a family of sequences closely related to the Ds1 element originally characterized from theAdh1-Fm335 allele of maize. Examples of these Ds1-related segments were cloned and sequenced. They also had the structural properties of mobile genetic elements, i.e., similar length and internal sequence homology with Ds1, 10- or 11-bp terminal inverted repeats, and characteristic duplications of flanking genomic DNA. All sequences with 11-bp terminal inverted repeats were flanked by 8-bp duplications, but the duplication flanking one sequence with 10-bp inverted repeats was only 6 bp. Similar Ds1-related sequences were cloned fromTripsacum dactyloides. They showed no more divergence from the maize sequences than the individual maize sequences showed when compared with each other. No consensus sequence was evident for the sites at which these sequences had inserted in genomic DNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101151
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  • 3
    Electronic Resource
    Electronic Resource
    N-banded karyotypes of wheat species (1977)
    Springer
    Chromosoma 62 (1977), S. 49-56 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Nine of the twenty-one chromosome pairs of the hexaploid wheat Triticum aestivum var. Chinese Spring (genome constitution AABBDD) show distinctive N-banding patterns. These nine chromosomes are 4A, 7A and all of the B genome chromosomes. The remaining chromosomes show either faint bands or no bands at all. Tetraploid wheat, T. dicoccoides (AABB), showed banded chromosomes similar to those observed in the hexaploid. Of the diploid species T. monococcum, T. boeoticum, T. urartu and Aegilops sauarrosa showed little or no banding as would be expected of donors of the A and D genomes. Ae. speltoides had a number of N-banded chromosomes as would be expected of a candidate for the B genome donor. Since N-bands are not evident on some nucleolar organiser chromosomes, the staining specificity cannot be correlated with the presence of nucleolar organiser regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328439
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular and chromosomal organization of DNA sequences coding for the ribosomal RNAs in cereals (1980)
    Springer
    Chromosoma 78 (1980), S. 293-311 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The chromosomal locations of ribosomal DNA in wheat, rye and barley have been determined by in situ hybridization using high specific activity 125I-rRNA. The 18S-5.8S-26S rRNA gene repeat units in hexaploid wheat (cv. Chinese Spring) are on chromosomes 1B, 6B and 5D. In rye (cv. Imperial) the repeat units occur at a single site on chromosome 1R(E), while in barley (cv. Clipper) they are on both the chromosomes (6 and 7) which show secondary constrictions. In wheat and rye the major 5S RNA gene sites are close to the cytological secondary constrictions where the 18S-5.8S-26S repeating units are found, but in barley the site is on a chromosome not carrying the other rDNA sequences. — Restriction enzyme and R-loop analyses showed the 18S-5.8S-26S repeating units to be approximately 9.5 kb long in wheat, 9.0 kb in rye and barley to have two repeat lengths of 9.5 kb and 10 kb. Electron microscopic and restriction enzyme data suggest that the two barley forms may not be interpersed. Digestion with EcoR1 gave similar patterns in the three species, with a single site in the 26S gene. Bam H1 digestion detected heterogeneity in the spacer regions of the two different repeats in barley, while in rye and wheat heterogeneity was shown within the 26S coding sequence by an absence of an effective Bam H1 site in some repeat units. EcoR1 and Bam H1 restriction sites have been mapped in each species. — The repeat unit of the 5S RNA genes was approximately 0.5 kb in wheat and rye and heterogeneity was evident. The analysis of the 5S RNA genes emphasizes the homoeology between chromosomes 1B of wheat and 1R of rye since both have these genes in the same position relative to the secondary constriction. In barley we did not find a dominant monomer repeat unit for the 5S genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327389
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  • 5
    Electronic Resource
    Electronic Resource
    The nucleolus organizers of diploid wheats revealed by in situ hybridization (1980)
    Springer
    Theoretical and applied genetics 58 (1980), S. 97-100 
    Details
    ISSN: 1432-2242
    Keywords: Nucleolus organizers ; In situ hybridisation ; Diploid wheats ; Ribosomal RNA genes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Labelled RNA, transcribed in vitro from wheat ribosomal DNA cloned in a bacterial plasmid, has been hybridised to metaphase chromosomes of five diploid wheats. Autoradiography of the chromosomes has provided unequivocal evidence that these genotypes possess two pairs of nucleolus organizer chromosomes. The diploid wheat accessions used possess widely differing numbers of ribosomal RNA genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263097
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  • 6
    Electronic Resource
    Electronic Resource
    The ribosomal RNA genes in synthetic tetraploids of wheat (1987)
    Springer
    Theoretical and applied genetics 75 (1987), S. 138-143 
    Details
    ISSN: 1432-2242
    Keywords: Wheat ; Ribosomal RNA genes ; Synthetic tetraploids ; Evolution ; Nucleolar activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ribosomal RNA genes in the A genome of tetraploid (AABB) wheats are either absent or present at low levels. In four synthetic AABB tetraploids tested by in situ hybridization with a radioactive probe, the level of radioactive label at A and B NOR's corresponded to those of the parent species. There was no reduction after ten generations. In addition, the A chromosome rDNA is transcriptively active, the numbers of nucleoli being governed by the number of rRNA gene repeats in the smaller of the two A-genome NOR's. Since the wild tetraploid Triticum dicoccoides, as well as its domesticated derivatives, lack A-genome NOR's, their deletion is likely to have occurred prior to domestication, i.e. more than 10,000 years ago.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249154
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