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  • 1
    Electronic Resource
    Electronic Resource
    Genetics, development and plant evolution
    Amsterdam : Elsevier
    Current Opinion in Genetics & Development 3 (1993), S. 865-872 
    Details
    ISSN: 0959-437X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0959-437X(93)90006-B
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  • 2
    Electronic Resource
    Electronic Resource
    Nucleotide sequence of the split tRNA^l^e^u(UAA) gene from Sorghum bicolor chloroplasts
    Amsterdam : Elsevier
    Gene 43 (1986), S. 169-174 
    Details
    ISSN: 0378-1119
    Keywords: A + T-rich sequence ; Recombinant DNA ; bacteriophage M13 ; exon ; maize ; open reading frame ; tRNA processing ; type I intron
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-1119(86)90020-X
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  • 3
    Electronic Resource
    Electronic Resource
    Evolution of a Noncoding Region of the Chloroplast Genome
    Amsterdam : Elsevier
    Molecular Phylogenetics and Evolution 2 (1993), S. 52-64 
    Details
    ISSN: 1055-7903
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/mpev.1993.1006
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  • 4
    Electronic Resource
    Electronic Resource
    Mapping the genes that made maize
    Amsterdam : Elsevier
    Trends in Genetics 8 (1992), S. 302-307 
    Details
    ISSN: 0168-9525
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9525(92)90138-T
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  • 5
    Electronic Resource
    Electronic Resource
    Mapping the genes that made maize
    Amsterdam : Elsevier
    Trends in Genetics 8 (1992), S. 302-307 
    Details
    ISSN: 0168-9525
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0168-9525(92)90261-2
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  • 6
    Electronic Resource
    Electronic Resource
    Insertion/deletion mutations in the Zea chloroplast genome (1987)
    Springer
    Current genetics 11 (1987), S. 617-624 
    Details
    ISSN: 1432-0983
    Keywords: Zea mays ; Chloroplast DNA ; Length mutations ; Taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The chloroplast (cp) genomes of Zea species are distinguished by at least four restriction fragment length (insertion/deletion) mutations. All four mutations occur in the large unique sequence region of the genome. Restriction fragments containing three of these mutations were cloned. The large and small forms of two of the mutated fragments were sequenced. This revealed 80 and 83 by insertion/deletions. The inserted/deleted segments are not parts of tandem repeats nor were they flanked by direct repeats. Two other insertion/deletion mutations were not sequenced, but their sizes were estimated to be 150 and 250 by by size fractionation on agarose gels. Use of Tripsacum pilosum and Sorghum bicolor as outgroups suggests that three of the fragment length mutations arose via deletions. The fourth could not be polarized. The three species of section Luxuriantes of Zea were identical to one another for each of the four length mutations, and they were consistantly distinguished from the taxa of section Zea by these mutations. These data support the division of Zea into the above named sections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393925
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  • 7
    Electronic Resource
    Electronic Resource
    Patterns of allozyme variation in cultivated and wild Sorghum bicolor (1992)
    Springer
    Theoretical and applied genetics 85 (1992), S. 451-460 
    Details
    ISSN: 1432-2242
    Keywords: Sorghum ; Isozyme ; Genetic diversity ; Domestication ; Conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Patterns of allozyme variation were surveyed in collections of cultivated and wild sorghum from Africa, the Middle East, and Asia. Data for 30 isozyme loci from a total of 2067 plants representing 429 accessions were analyzed. Regional levels of genetic diversity in the cultivars are greater in northern and central Africa compared to southern Africa, the Middle East, or Asia. The spatial distribution of individual alleles at the most variable loci was studied by plotting allele frequencies on geographic maps covering the distribution of sorghum. Generally, many of the alleles with frequencies below 0.25 are localized in specific portions of the range and are commonly present in more than one race in that region. Several alleles occur in both wild and cultivated sorghum of one region and are absent from sorghum elsewhere, suggesting local introgression between the wild and cultivated forms. Although the same most common allele was found in the wild and cultivated gene pools at 29 of the 30 loci, phenetic analyses separated the majority of wild collections from the cultivars, indicating that the two gene pools are distinct. Wild sorghum from northeast and central Africa exhibits greater genetic similarities to the cultivars compared to wild sorghum of northwest or southern Africa. This is consistent with the theory that wild sorghum of northeast-central Africa is ancestral to domesticated sorghum. Wild sorghums of race arundinaceum of northwest Africa and race virgatum from Egypt are shown to be genetically distinct from both other forms of wild sorghum and from the cultivars. Suggestions for genetic conservation are presented in light of these data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222327
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  • 8
    Electronic Resource
    Electronic Resource
    Restriction fragment variation in the nuclear and chloroplast genomes of cultivated and wild Sorghum bicolor (1992)
    Springer
    Theoretical and applied genetics 85 (1992), S. 293-302 
    Details
    ISSN: 1432-2242
    Keywords: Sorghum ; RFLP ; Genetic diversity ; Domestication ; Introgression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Fifty-six accessions of cultivated and wild sorghum were surveyed for genetic diversity using 50 low-copy-number nuclear DNA sequence probes to detect restriction fragment length polymorphisms (RFLPs). These probes revealed greater genetic diversity in wild sorghum than in cultivated sorghum, including a larger number of alleles per locus and a greater portion of polymorphic loci in wild sorghum. In comparison to previously published isozyme analyses of the same accessions, RFLP analysis reveals a greater number of alleles per locus. Furthermore, many RFLP alleles have frequencies between 0.25–0.75, while the vast majority of isozyme alleles are either rare (〈 0.25) or near fixation (〉 0.75). Correlations between genetic and geographic distances among the accessions were stronger when calculated with RFLP than with isozyme data. Systematic relationships revealed by nuclear and chloroplast restriction site analysis indicate that cultivated sorghum is derived from the wild ssp. arundinaceum. The portion of the wild gene pool most genetically similar to the cultivars is from central-northeastern Africa. Previous published data also suggested that this is most likely the principal area of domestication of sorghum. Introgression between wild and cultivated sorghum was inferred from disconcordant relationships shown by nuclear and chloroplast DNA markers. Introgression apparently occurs infrequently enough that the crop and its wild relatives maintain distinct genetic constitutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222873
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  • 9
    Electronic Resource
    Electronic Resource
    Allozyme variation among the spontaneous species of Sorghum section Sorghum (Poaceae) (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 296-304 
    Details
    ISSN: 1432-2242
    Keywords: Sorghum ; Isozyme ; Genetic diversity ; Evolution ; Systematics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A survey of allozyme variation among the spontaneous taxa of Sorghum section Sorghum was undertaken. Eight plants each of 90 accessions representing the diploid S. bicolor (ssp. arundinaceum and drummondii) and the tetraploids S. almum and S. halepense were analyzed for 17 enzyme systems encoded by 30 loci. Low levels of variation were found within and among accessions, although there was more variation than is typical of inbreeding species. We found an average of 3.2 alleles per locus in ssp. arundinaceum, with a mean expected heterozygosity for the accessions of 0.034 and total panmictic heterozygosity of 0.154. An analysis of the apportionment of genetic variation among accessions of ssp. arundinaceum indicated that 26% of the variation occurs within accessions and 74% among accessions. Cultivated sorghum contains far less allozymic variation than ssp. arundinaceum, its presumed progenitor. This is consistent with the prediction that cultivated sorghum experienced a loss of genetic variation during domestication. For the most part, cultivated sorghum contains a subset of the allozymes found in ssp. arundinaceum. Principal component analysis revealed continuous variation among the accessions and geographic regions, with accessions failing to segregate into discrete clusters. However, accessions of race virgatum of ssp. arundinaceum occupied one end of the continuum and were, in that sense, distinguished from the other accessions. Similarly, most accessions of S. halepense and S. almum occupied the central portion of the continuum. The allozymic data presented here are consistent with the hypothesized origin of S. halepense via autopolyploidy or segmental allopolyploidy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210063
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  • 10
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    DNA sequence evidence for the segmental allotetraploid origin of maize (1997)
    National Academy of Sciences
    Details
    Publication Date: 1997-06-24
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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