Somatic chromosome numbers of four Eleocharis taxa from Korean populations (Cyperaceae)

IF 0.8 Q4 PLANT SCIENCES
Kyong-Sook Chung, Chang Shook Lee, Jung-Hyun Kim
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引用次数: 0

Abstract

Eleocharis R. Br. (Cyperaceae) is characterized by unbranched culms, one terminal spikelet, bisexual flowers, and bristly perianths, occurring mainly in circumboreal marshes and wetlands. There are about 250 species worldwide, and 15 taxa in Korea have been recognized. Chromosomes in Cyperaceae are known to be holocentric, missing constricted centromeres during cell division. For the first time, we report the chromosome counts of Eleocharis from Korean populations of E. attenuata f. laeviseta (Nakai) H. Hara (2n = 20); E. parvula (Roem. & Schult.) Link ex Bluff, Nees & Schauer (2n = 10); E. ussuriensis Zinserl. (2n = 16); and E. valleculosa var. setosa Ohwi (2n = 16). The populations exhibit variations in their chromosome sizes from ca.1.7 μm to ca. 6 μm, categorized as gradient and bimodal karyotypes. The karyotypes observed are congruent with previous phylogenetic groups proposed. To clarify the traditional and phylogenetic classification of Korean Eleocharis, further taxonomic and chromosomal investigations with additional taxon sampling efforts are required.
朝鲜族四个Eleocharis分类群的体细胞染色体数目(莎草科)
Eleocharis R.Br.(莎草科)的特征是无分枝的秆,一个顶生小穗,两性花,和刚毛的花被,主要出现在环北方的沼泽和湿地。全世界约有250个物种,韩国有15个分类群已被确认。莎草科的染色体已知为全着丝粒,在细胞分裂过程中缺少收缩的着丝粒。我们首次报道了来自韩国的E.defuta f.laeviseta(Nakai)H.Hara(2n=20)种群的Eleocharis的染色体计数;E.parvula(Roem.&Schult.)Link ex Bluff,Nees&Schauer(2n=10);乌苏里E.ussuriensis Zinserl。(2n=16);和E.valleculosa var.setosa Ohwi(2n=16)。种群的染色体大小从1.7μm到6μm不等,分为梯度型和双峰型。观察到的核型与先前提出的系统发育群一致。为了阐明朝鲜Eleocharis的传统分类和系统发育分类,需要进一步的分类学和染色体调查,并进行额外的分类单元采样工作。
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来源期刊
KOREAN JOURNAL OF PLANT TAXONOMY
KOREAN JOURNAL OF PLANT TAXONOMY Agricultural and Biological Sciences-Plant Science
CiteScore
1.50
自引率
40.00%
发文量
23
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