Chromosome Counts of Six Korean <i>Carex</i> Species (Cyperaceae)

Abstract

The meiotic chromosome numbers of six Carex species in three sections are counted; C. miyabei Franch. (n=42 II ) in sect. Carex, C. breviculmis R. Br. (n=31 II , 32 II , 33 II ), C. polyschoena H. Lév. & Vaniot (n=36 II , 37 II ), C. sabynensis Less. ex Kunth (n=27 II , 28 II ) in sect. Mitratae Kük., and C. heterolepis Bunge (n=37 II , 38 II , 40 II ) and C. forficula Franch. & Sav. (n=25 II , 27 II ) in sect. Phacocystis Dumort. The chromosome counts for C. miyabei, C. heterolepis, and C. forficula from Korean populations are verified for the first time.Considered with previous reports, all the species exhibit variations in chromosome number from n=4 to n=36. Contiguous variation in chromosome numbers and non-constricted meiotic chromosomes with holocentromeric nature suggest that aneuploidy and/or agmatoploidy and/or symploidy should have played an important role in the sections.

Meiotic chromosome numbers of five Carex taxa in Korea (Cyperaceae)

“…. This is the second count from Korean populations and incongruent from the both previous reports from a Japanese (Tanaka, 1948) and Korean populations, 2n = 84 (Chung et al, 2018). The species has been considered endemic to Japan until the very recently (Hoshino et al, 2011).…”

“…. Only one number is congruent from the previous reports from Japanese and Korean populations as n = 54 I I (Tanaka, 1937;Chung et al, 2018 are first counts for the species. C. neurocarpa grows mainly in wet places along ponds and riversides in China, Japan, Korea, and Far East Russia (Park et al, 2016).…”

“…ex Steud.) (Chung et al, 2018). Taxonomic and cytological research should be conducted to understand the two morphologically confusing taxa in the section.…”

“…Although chromosome number information is critical to understand Carex diversity, chromosome investigations on Korean Carex taxa have not been actively conducted. Among about 180 Korean native Carex, only 18 taxa have chromosome numbers reported (Kim, 2006;Lee and Kim, 2008;Chung et al, 2013;Chung et al, 2016Chung et al, , 2017Chung et al, 2018). The studies demonstrate polyploidy in Carex section Siderostictae Franch.…”

Chromosome number report of three Carex sect. Mitratae taxa (Cyperaceae) in Korea

“…) (Chung et al, 2017(Chung et al, , 2018 ) (Chung et al, 2016(Chung et al, , 2017. C. polyschoena and C. sabyenesis, common early-spring bloomers, exhibit high variation in chromosome number.…”