Ki Wan Nam’s research while affiliated with Pukyong National University and other places

... Both genera have a central vegetative axis with two pericentral cells, spermatangial structures with the filament type (usually in the apical urn-like depression), and tetrasporangia are formed from random epidermal cells. These features distinguish these genera from representatives of Eujanczewskia, which are anatomically close to Laurencia [51,52]. ...

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The Systematic History of the Tribe Laurencieae (Ceramiales, Rhodophyta) and the problems in studying representatives of this Taxon in the Far Eastern Seas of Russia

... Total DNA was extracted from fresh or dried samples using the Chelex method (Zuccarello et al. 1999). The partial sequence of the plastid-encoded ribulose-1, 5-bisphophate carboxylase/oxygenase large subunit gene (rbcL) was amplified using the primer pairs F321 and R1150 (Kang et al. 2020). PCR conditions followed a touchdown PCR as follows: initial denaturation at 94°C for 4 min, followed by 10 cycles of 94°C for 1 min, 55°C for 30sec, and a decrease in annealing temperature by 1°C per cycle, and 72°C for 1 min; followed by 25 cycles of 94°C 1min/45°C, 30sec /72°C for 1 min and a final step at 72°C for 5 min. ...

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A new species of Aglaothamnion (Ceramiales, Rhodophyta) from Korea, Aglaothamnion inkyui sp. nov.

... Our study demonstrates how DNA sequences can clarify the identity of misidentified samples. Kang et al. (2020) reported C. retortus in Honghyeon-ri, Namhae, Korea based on the rbcL gene. It is possible that this species has been established in other localities around the Pacific region, but historically misidentified and labeled as C. ocellatus. ...

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Chondrus retortus (Gigartinales, Rhodophyta) in Hawai ‘ i: a taxonomic and biogeographic puzzle

... This can result in better growth and potentially more ramuli. In the study Gao et al. (2019) new ramuli could be found on both new erect talus and fragments of early erect talus. The number of new ramuli was significantly greater at 25°C than at 15 and 20°C. ...

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Growth Analysis of Caulerpa lentillifera Cultivated at Laboratory Scale with Different Light IntensitiesGrowth Analysis of Caulerpa lentillifera Cultivated at Laboratory Scale with Different Light Intensities

... Even with the recent investments in molecular data and greater sampling intensity (Geraldino et al., 2009(Geraldino et al., , 2010Jesus et al., 2016Jesus et al., , 2019aNauer et al., 2014Nauer et al., , 2015Nauer et al., , 2016Nauer et al., , 2019Kang and Nam, 2018;Cabrera et al., 2020;Huisman et al., 2021;Kundu and Bast, 2021), Hypnea remains a source of several taxonomic problems, with challenging species delimitation (Price et al., 1992;Jesus et al., 2016Jesus et al., , 2019a. This has been pronounced not only in the most species-rich genus of Cystocloniaceae, but also in the family as a whole, as molecular efforts have been limited to a few genes so far (Hommersand and Fredericq, 2003;Won et al., 2016;Yang and Kim, 2017;Hoffman et al., 2018;Soares and Fujii, 2020;Tonicelli et al., 2021). ...

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Phylogenomics and taxon-rich phylogenies of new and historical specimens shed light on the systematics of Hypnea (Cystocloniaceae, Rhodophyta)

... Crouan et H. Crouan) Batters, is a filamentous alga composed of cylindrical cells containing parietal chloroplasts with multiple pyrenoids and twisted setae (Batters 1902;Correa et al. 1988;Kitayama & Yoshida 1992). This alga has also been reported as an epiphyte or endophyte of seaweed such as brown and red algae (Srinivasan 1961;Kitayama & Yoshida 1992;Kim et al. 2017). Given its existence within coral skeletons and its ability to share habitats with Ostreobium sp., we hypothesized that it may be able to acclimate to FRL in this severe environment. ...

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Far‐red light acclimation in Phaeophila dendroides ( Ulvales, Ulvophyceae ) isolated from a coral skeleton

... Similar zygote release and thallus recruitment have been observed in S. siliquosa studies in nearby areas, such as Geumgap in Jindo, Sinan, Heuksan, and Wando [21]. Additionally, the appearance rate of S. siliquosa thalli was higher in substrates where drying stress due to tidal exposure was reduced [36]. Therefore, securing attachment space, and the density and exposure conditions of existing thalli, likely played a decisive role in S. siliquosa recruitment. ...

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Population Characteristics and Habitat Management of the Useful Seaweed Silvetia siliquosa

... and chloroplast (rbcL and tufA) barcoding markers (Figure 1). This is reflected in numerous records (Chávez-Sánchez et al. 2019;Hofmann et al. 2010;Kirkendale et al. 2013;Manghisi et al. 2011;Miladi et al. 2018;Steinhagen et al. 2019;Woo and Ki 2017;Xie et al. 2020) that have led to many rearrangements and taxonomic revisions of the Ulva species (Cui et al. 2018;Hughey et al. 2019Hughey et al. , 2021Hughey et al. , 2022Krupnik et al. 2018;Rybak et al. 2014). As recorded by Guiry and Guiry (2023), only 155 of the 622 taxa described at the species and infraspecific levels are currently accepted; additionally, 105 names are currently of uncertain status. ...

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A DNA barcode inventory of the genus Ulva (Chlorophyta) along two Italian regions: updates and considerations

... On July 24, the green tide's coverage area decreased to 25.0 km 2 (Fig. 2F) and by August 8 the main body had basically dissipated. Previous studies have shown that the optimum temperature for the growth of U. prolifera is 20-25°C (Nam, 2016;Wang et al., 2018;He et al., 2019), and the sea surface temperature in the Yellow Sea in late May and early mid-June 2022, was precisely between 20°C and 26°C (Fig. 3A). The green tide in the southern Yellow Sea blooms from April to August, so the nutrient concentration in the sea area in spring is very important. ...

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Review of the development of the green tide and the process of control in the southern Yellow Sea in 2022

... If this compound originated from endemic microflora, one might expect it to be present in the outer tissues of the bark rather than from the inner stipe tissues. Most research has focused on surface microflora in seaweeds (Singh and Reddy 2014) but specific endophytic microflora (e.g., Streblonema spp., Ectocarpus sp., Laminariocolax tomentosoides; Bolbocoleon spp., Acrochaete spp., Enteromorpha spp and Mikrosyphar zosterae) are known to invade the intercellular spaces of tissues of L. hyperborea, and also other seaweeds (e.g., Chondrus ocellatus; Ellertsdóttir and Peters 1997;Ogandaga et al. 2017). It may be relevant that many of these putative microbial metabolites were more abundant in winter samples (Fig. 4), which as beach-cast material with apparent damage due to storm events, may have allowed microflora invasion. ...

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Tissues and industrial co-products formed during alginate extraction from Laminaria hyperborea provide different metabolite profiles depending on harvest season