Abstract
Somatic chromosome numbers of 47 accessions representing 28 Artemisia species are provided from Iran. Two basic chromosome numbers, x = 8, 9, each with diploid, tetraploid and hexaploid levels, were found. Different chromosome numbers, 2n = 16, 16 + 1B, 16 + 5B, 32, 48, and 2n = 18, 18 + 1B, 19, 36, 36 + 1B, 36 + 2B, 37, 49 + 2B, 49 + 3B, 51 + 6B, 54, 54 + 1B, 54 + 3B, 54 + 5B, in studied accessions were identified. Chromosome numbers are reported for the first time in three species, counts in four species are new for Iran, and other counts have been thoroughly compared to previous data. Forty percent of the studied accessions are polyploid and B-chromosome(s) are reported in 17 % of accessions. Aneuploidy and aneusomy are other relevant cytological phenomena. Some karyological parameters, total karyotype length, karyotype formula, mean value of centromeric indices, mean arm ratio, A 1 and A 2 indices, were estimated to characterize the karyotypes numerically. A 1 and A 2 indices showed that karyotypes tend to be asymmetric in polyploid and dysploid taxa. PCA analysis of all karyological parameters has shown some systematic and evolutionary implications. The consideration of all these chromosome numbers and cytogenetic mechanisms has led us to infer the different patterns of chromosomal evolution in the genus.
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Acknowledgments
All the field expedition expenses and facilities (laboratory materials and instruments) have been supplied from a national project on Iranian Artemisia L. species by the Iranian Biological Resource Centre (P-1388-06). The collaboration of projects CGL2010-22234-C02-01 and 02/BOS and 2009SGR0439, respectively from the Spanish and Catalan governments, is also acknowledged. Samuel Pyke (Jardí Botànic de Barcelona) is thanked for the English language revision. An anonymous reviewer is thanked for helpful comments in order to improve the manuscript.
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Dolatyari, A., Vallès, J., Naghavi, M.R. et al. Karyological data of 47 accessions of 28 Artemisia (Asteraceae, Anthemideae) species from Iran, with first new reports for Iranian populations and first absolute counts in three species. Plant Syst Evol 299, 1503–1518 (2013). https://doi.org/10.1007/s00606-013-0813-y
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DOI: https://doi.org/10.1007/s00606-013-0813-y