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    Karyological studies of eight Carduus L. (Asteraceae, Cardueae) taxa from Turkey
    (Firenze Univ Press, 2016) Gedik, Osman; Kiran, Yasar; Arabaci, Turan; Kostekci, Serkan
    The somatic chromosome numbers and detailed morphometric properties of 18 specimens belonging to eight taxa (six species) of genus Carduus L. distributed in Turkey were examined. The somatic chromosome numbers were determined as 2n = 2x = 22 in C. olympicus Boiss. subsp. hypoleucus (Bornm.) P. H. Davis, C. tmoleus Boiss. subsp. tmoleus and C. acanthoides L. s.l.; 2n = 2x = 18 in C. candicans Waldst. & Kit. s.l. and 2n = 2x = 16 in C. nutans L. subsp. falcato-incurvus P. H. Davis (2798). In addition, tetraploid chromosome numbers (2n = 4x = 32) were also observed in C. nutans subsp. falcato-incurvus (2737) and C. onopordioides Fisch. ex M. Bieb. subsp. turcicus (Kazmi) P. H. Davis. Karyotype analysis indicated that chromosomes of Carduus taxa generally have median region (m) and submedian region (sm) karyotypes. A median point (M) karyotypes is found in C. acanthoides subsp. acanthoides (2728). Secondary structures and one to three pairs of satellite chromosomes (sat-chromosome) were observed in some of the examined specimens. The findings for each of the analysed taxa are compared with the results of previous studies. The chromosome number and morphology of C. olympicus subsp. hypoleucus, C. nutans subsp. falcato-incurvus, C. onopordioides subsp. turcicus, C. candicans subsp. globifer and C. acanthoides subsp. sintenisii are reported here for the first time.
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    Karyological studies on the annual members of the genus Carduus L. (Asteraceae, Cardueae) from Turkey
    (Firenze Univ Press, 2014) Gedik, Osman; Kiran, Yasar; Arabaci, Turan; Kostekci, Serkan
    The somatic chromosome numbers and detailed morphometric properties of eight of the nine annual Turkish Carduus L. taxa were examined. The somatic chromosome numbers were 2n = 2x = 22 in C. rechingerianus Kazmi; 2n = 2x = 28 in C. argentatus L., C. acicularis Bertol. and C. pycnocephalus L. subsp. albidus (M. Bieb.) Kazmi; 2n = 2x = 34 in C. pycnocephalus subsp. arabicus (Jacq. ex Murray) Nyman and subsp. breviphyllarius P. H. Davis; 2n = 2x = 50 in C. nervosus K. Koch.; and 2n = 2x = 62 in C. pycnocephalus subsp. pycnocephalus. Karyotype analysis indicated that chromosomes of the Carduus taxa generally have centromere median region (m), submedian region (sm), and rarely median point (M) of the chromosome. A pair of satellite chromosomes (sat-chromosome) was observed in C. pycnocephalus subsp. breviphyllarius. The findings for each of the analysed taxa are compared with the results of previous studies. The chromosome number and morphology of C. nervosus, C. rechingerianus, C. argentatus, C. pycnocephalus subsp. arabicus and subsp. breviphyllarius are newly reported here.