https://repository.kopri.re.kr/handle/201206/5200 2026-04-17T15:40:44Z https://repository.kopri.re.kr/handle/201206/5621 Title: Taxonomic Revision of Gracilaria "verrucosa" from Russian Far East Based on Morphological and Molecular Data Authors: Choi, Han-Gu; Anna V. Skriptsova Abstract: Gracilaria "verrucosa" is regarded an invalid name and the combination G. gracilis has been used in recent studies of Gracilaria from the Russian coast of the East Sea (=Sea of Japan). This has created nomenclatural confusion within members of the genus in this region. Here, we revise the taxonomy of G. "verrucosa" from Peter the Great Bay (East Sea, Russia) based on a morpho-anatomical characters and comparison of nuclear SSU rDNA, plastid rbcL and mitochondrial cox1 sequence data. No differences were found between the sequences for attached and unattached forms of Gracilaria "verrucosa". Molecular data also indicated that G. "verrucosa" from Peter the Great Bay is conspecific with Gracilaria vermiculophylla from the northwestern Pacific and the Russian population is closely related to Korean-Japanese populations from the East Sea rather than to populations on the Pacific coast of Japan. 2009-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/7926 Title: MORPHOLOGICAL CHARACTERISTICS OF THREE CRYPTIC SPECIES RELATED TO PORPHYRA TENERA KJELLMAN ELUCIDATED BY MOLECULAR DATA Authors: Oh, Y-S; Choi, Han-Gu; Hwang, E-K; Hwang, M-S; Gong, Y-G; Lee, S-Y; Kim, S-C; Ha, D-S Abstract: In the previous study, three cryptic species were elucidated by the analysis of molecular data (nuclear SSU rDNA, plastid rbcL and mitochondrial cox1 gene sequences) to find out the phylogenetic relationship of Porphyra tenera Kjellman and its related species from Korea and Japan: P. kinositae (Yamada et Tanaka) Fukuhara, P. koreana Hwang et Lee, P. kuniedae Kurogi, P. yezoensis Ueda. The morphological characters discriminating the species other than the cryptic ones are thickness of gametophytic thalli, shape of spermatangial sori, division pattern of spermatangia and zygotosporangia, and so on. However, the characters show the variation according to the environmental conditions so that the species discrimination has been problematic even to Porphyra taxonomists. The cryptic species are hardly distinguished from P. yezoensis by those characters, and only minute differences were observed in the length of trychogynes on carpogonia of gametophytic thalli and some characters of sporophytic thalli such as the length of vegetative cells of conchocelis filaments, the branching pattern of conchosporangial branches. Morphological characteristics of gametophytic and sporophytic thalli of each cryptic species will be presented and the incongruity of divergence degree between morphological and molecular characters in a group including P. tenera and its related species will be discussed. 2009-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/7925 Title: ALGAE OF THE FAMILY GRACILARIACEAE (GRACILARIALES, RHODOPHYTA) FROM THE RUSSIAN PACIFIC COASTS Authors: A. V. Skriptsova; O. N. Selivanova; Choi, Han-Gu Abstract: Algae of the family Gracilariaceae represent economically important seaweed resources of the Russian Pacific though they are few in number. Only two species of Gracilaria were for certain recorded from this area: G. textorii with flattened frond and the alga with terete frond known for a long time as G. verrucosa. Lately it was treated in Russian literature as G. gracilis, however it raised our doubts. Up to now taxonomy of these algae was understudied, so our purpose was to clarify it. Our study revealed that "G. gracilis" represented two different species. One was described as a new species Gracilaria austramaritima Przhemenetskaya in Selivanova et al., 2008. The other one had morphological similarity with G. vermiculophylla from the south-eastern Asia (Vietnam, China, Japan). Molecular data (cox1) confirmed that algae from the Russian Pacific coasts identified as G. gracilis in fact represented G. vermiculophylla. Comparison of G. austramaritima and G. vermiculophylla revealed their difference in gross morphology and life cycles. Gracilaria austramaritima has much in common with G. rhodocaudata from Japan but differs from the latter and other morphologically close species from the North Pacific by huge size and the absence of nutritive filaments in the gonimoblast. Molecular data showed close affinity of G. austramaritima with Gracilaria (=Gracilariopsis) chorda. Thus there are at least three species of Gracilaria in the Russian Pacific: G. textorii, G. vermiculophylla and G. austramaritima. Additional studies are necessary to clarify phylogenetic relationships of G. austramaritima and Gracilariopsis chorda. 2009-01-01T00:00:00Z