, Volume 14, Issue 3, pp 307–314 | Cite as

Cytological and genetical studies on hybrids between sorghum almum parodi (2n=40) and some diploid (2n=20) species of sorghum

  • A. J. Pritchard


Hybridization between S. almum (2n=40) and diploid (2n=20) species of Sorghum resulted in plants with 2n=40 and 2n=30 chromosomes. As segregation for many characters occurred in the offspring of those with 2n=40, hybrids of this type provide a means of transferring genes from the diploid to the tetraploid species of Eu-sorghum. Segregations for some genes in the progeny of these hybrids revealed heterozygosity in S. almum which may indicate that one of the ancestors of S. almum was a variety of S. vulgare very similar to the commercial grain sorghum.

The triploids were only slightly fertile and the chromosome numbers of plants resulting from backcrossing to S. almum ranged from 30 to 46. Some of the plants with the higher chromosome numbers were self-fertile and segregation for genes which were present in the original diploid and tetraploid parents were observed in their off-spring. Backcrossing the triploid to the diploid parent produced fertile plants with 2n=20 and it is possible that the triploids could be used to transfer genes from the tetraploid to the diploid species of Eu-sorghum.

The chromosome pairing in the triploids was similar to that expected in an autotriploid, but some non-homologous pairing was detected which may be the result of duplication of some chromosomes or chromosome segments within the genome (n=10) of S. vulgare.


Plant Physiology Genetical Study Sorghum Chromosome Number Chromosome Pairing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    BrownM. S., (1943) Haploid plants in Sorghum. J. Hered. 34: 163–166.Google Scholar
  2. 2.
    CelarierR. P. (1958). Cytotaxonomic notes on the subsection Halepensia of the genus Sorghum. Bull. Torrey Bot. Cl. 85: 49–62.Google Scholar
  3. 3.
    ChenC. H. and RossJ. G. (1963). Colchicine induced somatic chromosome reduction in Sorghum I. Induction of diploid plants from tetraploid seedlings. J. Hered. 54: 96–100.Google Scholar
  4. 4.
    CraigmilesJ. P. (1962). Genetic inheritance of cytoplasmic male-sterility in sudangrass. Crop. Sci. 2: 203–205.Google Scholar
  5. 5.
    DarlingtonC. D. and LaCourL. F. (1960). The handling of chromosomes. (Allen and Unwin: London.)Google Scholar
  6. 6.
    EndrizziJ. E. (1957). Cytological studies of some species and species hybrids in Eu-sorghums. Bot. Gaz. 119: 1–10.Google Scholar
  7. 7.
    EndrizziJ. E. and MorganD. T. (1955). Chromosomal interchanges and evidence for duplication in haploid Sorghum vulgare. J. Hered. 46: 201–208.Google Scholar
  8. 8.
    ErichsenA. W. and RossJ. G. (1963). A triploid derived from a selfed haploid sorghum plant. Crop. Sci. 3: 99–100.Google Scholar
  9. 9.
    KiddH. J. (1952). Haploid and triploid Sorghum. J. Hered. 43: 204, 225.Google Scholar
  10. 10.
    MaunderA. B., and PickettR. C. (1955). The genetic inheritance of cytoplasmic-genetic male sterility in grain sorghum. Agron. J. 51: 47–49.Google Scholar
  11. 11.
    PriceM. E. and RossW. M. (1957). Cytological studies of a triploid x diploid cross of Sorgghum vulgare Pers. Agron. J. 49: 237–240.Google Scholar
  12. 12.
    PritchardA. J. (1964). Comparative trials with Sorghum almum and other forage sorghums in south-east Queensland. Aust. J. Expt. Agric. Anim. Husb. 4: 6–14.Google Scholar
  13. 13.
    QuinbyJ. R. and KarperR. E. (1954). Inheritance of height in sorghum. Agron. J. 46: 211–216.Google Scholar
  14. 14.
    SandersM. E. and FranzkeC. J. (1962). Reduction of tetraploid sorghum to diploid form after colchicine treatment. Nature 196: 696–698.Google Scholar
  15. 15.
    StephensJ. C. and QuinbyJ. R. (1933). Bulk emasculation of sorghum flowers. J. Amer. Soc. Agron. 25: 233–234.Google Scholar
  16. 16.
    StevensW. L. (1943). Accuracy of mutation rates. J. Genet. 43: 301–307.Google Scholar

Copyright information

© H. Veenman En Zonen n.v 1965

Authors and Affiliations

  • A. J. Pritchard
    • 1
  1. 1.Division of Tropical PasturesC.S.I.R.O., Cunningham LaboratoryBrisbane

Personalised recommendations