Abstract
Abstract: We investigated 28 taxa of the genus Achillea from 85 natural populations. The chromosome numbers of 75 populations are presented for the first time, all showing a basic number of 9 chromosomes. The chromosome numbers of A. alexandri-regis and A. lucana have not previously been reported (both diploid with 2n = 2x = 18). New ploidy levels are reported for A. ageratifolia subsp. ageratifolia (tetraploid with 2n = 4x = 36) and for A. stricta (octoploid with 2n = 8x = 72). B-chromosomes were observed in one population each of A. fraasii and A. holosericea. There are confirmed indications in literature for the other chromosome numbers. The karyotype was investigated for 27 taxa from 79 natural populations. Haploid karyotypes in all taxa of Achillea are highly homogeneous with seven metacentric and two submeta- to subtelocentric chromosomes, the latter with satellites. Karyotypes are indicated for the first time for ten taxa, viz. Achillea alexandri-regis, A. atrata, A. erba-rotta, A. grandifolia, A. ...
Highlights
Cytological data within a taxon (e.g. family, genus or species) may vary with respect to the number of chromosomes (including ploidy level and aneuploidy), but may show variation in absolute and relative size, in morphology, and in staining properties of the respective chromosomes (Sharma & Sen 2002)
Cytological data within a taxon may vary with respect to the number of chromosomes, but may show variation in absolute and relative size, in morphology, and in staining properties of the respective chromosomes (Sharma & Sen 2002)
Karyotypes are indicated for the first time for ten taxa, viz. Achillea alexandri-regis, A. atrata, A. erba-rotta, A. grandifolia, A. lucana, A. macrophylla, A. moschata, A. nana, A. pindicola subsp. integrifolia, A. ptarmica and A. tomentosa
Summary
Cytological data within a taxon (e.g. family, genus or species) may vary with respect to the number of chromosomes (including ploidy level and aneuploidy), but may show variation in absolute and relative size, in morphology, and in staining properties of the respective chromosomes (Sharma & Sen 2002). Plants from all nine sites investigated showed the same haploid karyotype of seven metacentric and two submeta- to subtelocentric chromosomes, the latter with satellites. The plants from Macedonia investigated here were diploid with 2n = 2x = 18 chromosomes and showed a haploid karyotype with seven metacentric and two submeta- to subtelocentric chromosomes, the latter with satellites, which corroborates the indications in Kuzmanov & al.
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