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Biologia Plantarum

, 36:37 | Cite as

Cytological relationships of selected species ofPanicum L.

  • M. A. Hamoud
  • S. A. Haroun
  • R. D. MacLeod
  • A. J. Richards
Original Papers

Abstract

The cytological investigation of 12 taxa ofPanicum L. revealed that the vast majority of them have the basic number x=9 at different ploidy levels. The basic number x=8 was recorded only in the tetraploid speciesP. maximum with 2n=32. The diploid number 2n=18 was encountered inP. capillare, P. laevifolium, P. antidotale andP. coloratum (2) with 3B-chromosomes recorded in the latter species. The tetraploid chromosome number 2n=36 was found to exist inP. miliaceum, P. miliare, P. coloratum (1) andP. virgatum. The hexaploid number 2n=54 was recorded inP. bulbosum, P. dichotomiflorum andP. esculentum. The karyotypes of all accessions were mostly symmetrical and mainly comprised of meta- and submetacentric chromosomes with little variation in length among them within each karyotype. Investigation of chromosome association during metaphase I of meiosis revealed that the frequency of bivalents/cell was the highest among all investigated diploid, tetraploid and hexaploid accessions. Univalents were also frequently encountered in various accessions. These results may indicate that segmental alloploidy has been the major process by which polyploid species have originated.

Keywords

Chromosome Number Cytological Study Basic Number Chromosome Length Metacentric Chromosome 
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.

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Copyright information

© Institute of Experimental Botany 1994

Authors and Affiliations

  • M. A. Hamoud
    • 1
  • S. A. Haroun
    • 1
  • R. D. MacLeod
    • 2
  • A. J. Richards
    • 2
  1. 1.Botany Department, Faculty of ScienceTanta UniversityTantaEgypt
  2. 2.Department of BiologyUniversity of Newcastle upon TyneNewcastleEngland

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