• Korean Journal of Ecology and Environment
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• v.40 no.3
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• pp.387-394
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• 2007

Despite geographic barriers such as oceans, many freshwater algal species inhabit different continents of the world. A unicellular freshwater alga, Mallomonas caudeata, commonly occurring in Asia, Europe, and America of the northern Hemisphere, is closely related to human life such as monitoring blooms and defecting changes in climates. In order to demonstrate its occurrence in Korea and to infer its phylogeny, we sequenced nuclear SSU and plastid rbcL genes from isolates collected in six different reservoirs. We have also investigated transmission electron microscopy of the Korean isolates. SSU sequences of the species from Korea and USA were almost identical, having pair-wise divergences of 0.06% in SSU and 0.45% in rbcL. Both gene trees revealed that the species was clearly separated from other species of the genus, while the genus was not monophyletic. Rhizoplasts are composed of microfibrils organised in striated rootlets attached to the multilayered plate of basal bodies and arranged on the surface of the nucleus at their distal ends. The rhizoplast constitutes a basal body-nucleus connector similar to that of typical Synurophyceas. The results that Mallomonas was not supported by both SSU and rbeL data sets require a further study with additional taxon sampling.

• Korean Journal of Plant Taxonomy
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• v.46 no.3
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• pp.314-325
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• 2016

Multiple changes of the photosynthesis pathway are independent evolutionary events occurring in the phylogeny of flowering plants, and such changes have occurred more than five times in Cyperaceae. In the tribe Cypereae, the C4 photosynthetic pathway appeared only once and is regarded as a synapomorphy of the C4 plants within this tribe. The morphological delimitation of genera within Cypereae does not correspond to their molecular phylogenetic relationships. In this study, the molecular phylogeny was compared with the photosynthetic pathways of Korean Cypereae (18 species of Cyperus, 1 species of Kyllinga, and 1 species of Lipocarpha). The photosynthetic pathways were determined by observing the leaf anatomy. The phylogenetic analysis was performed using three DNA regions (nrITS, rbcL, and trnL-F). According to the position of the photosynthetic tissue, 4 species (C. difformis, C. flaccidus, C. haspan, and C. tenuispica) and 16 species (14 Cyperus species, K. brevifolia var. leiolepis, and L. microcephala) were confirmed as C3 and C4 plants, respectively. Tribe Cypereae was divided into the CYPERUS and FICINIA clades, and all species of Korean Cypereae plants belonged to the CYPERUS clade in the phylogenetic analysis. Within the CYPERUS clade, C4 plants were monophyletic but their phylogenetic relationships were unclear. The genera Kyllinga and Lipocarpha were not supported as an independent genus in either case because they were nested by the Cyperus species in the molecular phylogenetic trees in the present and in previous studies. To determine the classification within the CYPERUS clade, a detailed morphological study and a molecular phylogenetic analysis at a high resolution will be necessary.