| Abstrakt: |
AbstractA karyological study of 53 populations of four Aegilopsspecies (A. geniculata, A. triuncialis, A. ventricosaand A. neglecta) sampled in different eco-geographical sites in the north of Algeria was carried out using the Feulgen staining method. Chromosome counting showed that three species, A. geniculata, A. triuncialisand A. ventricosa, were tetraploid (2n= 4x= 28), whereas A. neglectais hexaploid (2n= 6x= 42). Karyo-morphometric analysis of somatic metaphase chromosomes revealed four cytotypes in A. geniculataand two cytotypes in A. triuncialis, A. ventricosaand A. neglecta. The cytotypes found within the studied populations are differentiated by the lengths of the chromosomes, the symmetry of karyotypes and the presence or absence of the satellites. This difference indicates the relationships among Aegilopsspecies by absence of telocentric chromosomes in any karyotype formula. However, chromosomes pairings in diakinesis, metaphase I and anaphase I revealed a less regular meiosis of tetraploid and hexaploid samples, with univalent, chromosomes lagging and chromatin bridges anomalies. Finally, results show the high genetic diversity of Aegilopspopulations from Algeria, suggesting that environmental factors and geographical location might have an effect on the genetic structure and evolution of chromosomes, which is of interest for cytogenetic identification and characterization of populations, to assess and enhance plant genetic resources. |
