<p><strong>Cytotaxonomy of five <em>Arabis</em> L. (Brassicaceae) species endemic to Turkey</strong></p>

Abstract

In this study, the karyomorphology of five endemic Arabis taxa (A. alanyensis, A. androsacea, A. aubrietioides, A. davisii, and A. deflexa) was examined. The chromosome number of these species was determined for the first time. As a result of the karyomorphological studies, the chromosome number was determined to be x =8 for all species. Arabis androsacea and A. aubrietioides are tetraploid whereas other species are diploid. Considering the asymmetry indices, we can conclude that all taxa have symmetrical karyotypes. The most common karyotype formulas are 2n = 4x = 32m and 2n = 2x = 14m + 2sm, respectively. Arabis davisii (on the second chromosome pair) and A. deflexa (on the third chromosome pair) are distinguished from others by showing a secondary constriction.

Cytotaxonomy of Eight <i>Thlaspi</i> L. <i>Sensu Lato</i> (Brassicaceae) Species Endemic to Turkey

“…The family Brassicaceae that includes many economically important ornamental and agricultural plants is a monophyletic set composed of 338 genera and 3709 taxa worldwide (Al-Shehbaz et al 2006). In Turkey, Brassicaceae is of the 93 genera and 583 taxa (Al-Shehbaz et al 2007, Şirin 2020. Records of the chromosome number belonging to 232 genera including 1564 species of the family are reached in previous reports.…”

“…The chromosomes of the plant species are valuable parameters for almost all species of cytotaxonomical reports (Astuti et al 2017(Astuti et al , Şirin 2020. Genetic data of an organism is transferred through its chromosomes, whose changes in number (like polyploidy and dysploidy) and structure (like deletion, inversion, and translocation) shed light on explaining plant speciation and evolution (Levin 2002, Schubert 2007, Leitch and Leitch 2008, Karaismailoğlu 2018, Şirin 2020.…”

“…Records of the chromosome number belonging to 232 genera including 1564 species of the family are reached in previous reports. The basic chromosome numbers range between 4 and 13 (Warwick and Al-Shehbaz 2006, Karaismailoğlu 2018, Şirin 2020.…”

“…Meyer (1973Meyer ( , 1979 has separated the genus into 12 genera, based mainly on seed-coat anatomy. Meyerʼs classification has not been recognized by numerous investigators as a consequence of its limiting taxonomical technique (Greuter and Burdet 1983, Appeal and Al-Shehbaz 2003, Karaismailoğlu and Erol 2018, 2020. A molecular phylogenetic study has pointed out that ten genera were removed from the genera of by Meyer (1973) and have placed in Noccaea Moench (Al-Shehbaz 2014).…”

“…Notwithstanding few surveys on the inter-specific relations of the genus, classification difficulties have not been solved yet (Karaismailoğlu and Erol 2018, 2020. Two of the main difficulties of the genus are that (1) the number of species is designed without showing taxonomic relationships, and (2) herbarium material, which usually contains incomplete specimens or a single specimen of a species based on insufficient fieldwork, has been evaluated within the scope of studies (Karaismailoğlu and Erol 2018, 2020. Therefore, the examined species have been evaluated within the scope of Thlaspi s.l.…”