Chromosome counts and karyotype analysis of some representatives of genusCirsiumMill. (Asteraceae) in Turkey

Abstract

The chromosome number and karyotype analysis of nine species ( 10taxa) of genus Cirsium Mill. distributed in Turkey were analyzed. The somatic chromosome number of Cirsium sipyleum O. Schwarz, C. candelabrum Griseb., C. creticum d'Urv. subsp. creticum, C. elodes M. Bieb., C. subinerme Fisch. & C. A. Mey., C. leucopsis DC., C. libanoticum DC. subsp. arachnoideum P. H. Davis & Parris and C. arvense (L.) Scop. were determined as 2n=2x=34. Cirsium pubigerum DC. var. caniforme Petr. and var. paphlagonicum Petr. showed 2n=4x=68 chromosome numbers. The chromosomes of the examined taxa predominantly have median region (m) and rarely median point (M) and submedian region (sm) karyotypes. The chromosome number and morphology of Cirsium sipyleum, C. pubigerum var. paphlagonicum, C. leucopsis and C. libanoticum subsp. arachnoideum are newly reported in the present study.

Chromosome Evolution in Korean <i>Carduus</i>-<i>Cirsium</i> Taxa (Asteraceae)

“…Due to the small chromosomal size compared with A chromosomes, B-chromosomes were easily distinguishable in C. japonicum var. japonicum (2n=2n=34+1B sium is predominantly diploid, with the prevalence of 2n=34, which we reported for four of nine analyzed taxa (Table 1), followed by 2n=32 in two taxa with variable chromosome numbers that included 2n=30, 31, 32 in C. setidens due to the occurrence of aneuploids; 2n=28 in C. lineare was found less frequently; and 2n=18 in Carduus crispus, which was in agreement with previously published data (Rice et al 2015, Polat et al 2018.…”

“…Korean Carduus-Cirsium taxa have small chromosomes (Table 2) and the haploid karyotype length varied more than three-fold between 20.41 µm in C. setidens (2n=2x=31) and 67.30 µm in C. nipponicum (2n=4x= 68) due to polyploidization (Table 2). However, no significant chromosome size differences were found among individuals within the studied taxa, consistent with other Cirsium species (Nouroozi et al 2010, Ozcan et al 2011, Polat et al 2018. Karyotypes of Korean Carduus-Cirsium taxa were mostly symmetrical and consisted almost exclusively of metacentric and submetacentric chromosomes, which agreed with previous reports in other Cirsium taxa (Nouroozi et al 2010, Ozcan et al 2011, Polat et al 2018.…”

“…However, no significant chromosome size differences were found among individuals within the studied taxa, consistent with other Cirsium species (Nouroozi et al 2010, Ozcan et al 2011, Polat et al 2018. Karyotypes of Korean Carduus-Cirsium taxa were mostly symmetrical and consisted almost exclusively of metacentric and submetacentric chromosomes, which agreed with previous reports in other Cirsium taxa (Nouroozi et al 2010, Ozcan et al 2011, Polat et al 2018.…”

Hybridization among three Cirsium (Asteraceae) species and important evidence for three new hybrids from Turkey

“…and C. vulgare (Savi) Ten. have the somatic chromosome number 2n = 4x = 68 (Ozcan et al, 2011;Yüksel et al, 2013;Polat et al, 2018).…”