Variation of chromosome numbers in Tanacetum parthenium Schultz Bip. (Asteraceae) in Iran

Abstract

ABSTRACT:Original chromosome counts are reported in 16 populations of Tanactum parthenium Schultz Bip. (Asteraceae) collected from west of Iran. Chromosome numbers in the species were varied from 2n=2x=18 to 2n=4x=36. Ten diploid populations (2n=2x=18) were detected in the studied areas that are accordance with the few prior reports. Three populations with both diploid and tetraploid chromosome number (2n=2x=18 and 36) were identified that is the first report for this species. The results indicated that intraspecific polyploidy was confirmed as the most significant evolutionary trend in chromosome number within this species.

Karyomorphological study of nineTanacetumtaxa (Asteraceae, Anthemideae) from Iran

“…Hajisadeghian 2009;Chehregani et al 2011). Our results for the presence of tetraploidy in two subspecies of T. polycephalum, i.e.…”

“…Chromosome counts in many members of Anthemideae have already been reported (e.g. Torrell et al 2001;Inceer and Beyazoglu 2004;Vallès et al 2005;Garcia et al 2006;Inceer et al 2007Inceer et al , 2012Li et al 2008;Chehregani and Mehanfar 2008;Chehregani and Hajisadeghian 2009;Chehregani et al 2011).…”

“…Karyological studies of the genus Tanacetum in Iran have been performed only by a few researchers (Chehregani and Mehanfar 2008;Chehregani and Hajisadeghian 2009;Chehregani et al 2011) and the reported chromosome numbers include 2n = 18, 27, 36, 54, 72 and 90. Chromosomal data are still scarce or not existent for numerous Tanacetum taxa.…”

Cytological investigations on Achillea wilhelmsii C.Koch (Asteraceae) in the western part of Iran

“…Meristems were hydrolyzed in 1 M hydrochloric acid for 30 min at room temperature. They were then stained in 2% aceto-orcein for 3h at 4°C (Chehregani et al 2012). Squashes were made in 45% acetic acid.…”

Karyotype Analysis in Ten Taxa of <i>Tanacetum</i> L. (Asteraceae) from Turkey

“…As well as the most common chromosome number of Anthemideae is x=8; x=9 and x=10 have been also reported by some researchers (Vallès et al 2005, Chehregani andHajısadeghıan 2009). The basic chromosome number in the genus Tanacetum is x=9 and its species is mostly 2n=2x=18 (Chehregani et al 2012). Cytogenetic studies on Tanacetum generally focused on determination of chromosome numbers (Brown et al 1999, Baltisberger 2006, Li et al 2008 and there was a less detailed study of karyotype analysis.…”