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Comp Cytogenet. 2013 Oct 24;7(4):271-7. doi: 10.3897/CompCytogen.v7i4.6075. eCollection 2013.

Cytological investigations and new chromosome number reports in yarrow (Achillea millefolium Linnaeus, 1753) accessions from Iran.

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  • 1Biology Department, Faculty of Science, Payam Noor University, Tehran, Iran.
  • 2Department of Agronomy and Plant Breeding, College of Abouraihan, University of Tehran, Tehran, Iran.
  • 3Department of Horticultural Sciences, faculty of Agriculture, University of Tabriz, Tabriz, Iran.


In this study, a new chromosome number for Iranian yarrow (Achillea millefolium L.) accessions was reported. Cytological analyses on four Achillea millefolium accessions, indicated that two accessions were diploids (2n=2x=18) and two tetraploids (2n=4x=36). Cluster analysis based on chromosomal characteristics and karyotype asymmetry, categorized the four accessions separated into two groups. In terms of the Stebbins' system, the karyotype of diploid accessions grouped in 2A class. The average value of the total form percentage (TF%) in the group one (diploid accessions) and two (tetraploid accessions) were 40.85 and 41.15, respectively. The group one had the highest mean value for the symmetry index (S%=57.5). Consequently, it can be inferred that diploids belonging to the group one are the earlier evolutionary forms.


Achillea millefolium; chromosome number; karyotype; ploidy level

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