Morphological and genetic differences between Korean Sugwawon No. 301 and Chinese Huangguan No. 1 strains of Saccharina
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23RD INTERNATIONAL SEAWEED SYMPOSIUM, JEJU
Morphological and genetic differences between Korean Sugwawon No. 301 and Chinese Huangguan No. 1 strains of Saccharina japonica (Phaeophyceae) in a Korean aquaculture farm Eun Kyoung Hwang 1 & Ji Won Choi 2 & Hwan Su Yoon 2 & Chan Sun Park 3 Received: 17 June 2019 / Revised and accepted: 29 December 2019 # Springer Nature B.V. 2020
Abstract We compared the cultivation performance and genetic characteristics of Korean (Sugwawon No. 301) and Chinese strains (Huangguan No. 1) of the brown alga Saccharina japonica at an aquaculture farm in Korea. The number of cortical layer cells and the area of the cortical cells were measured for different size groups (5, 15, 30, 50, 100, 150 cm) of the two strains in a Korean culture farm from January to June 2018. We found better performance of the Sugwawon No. 301 strain in Korean waters, possibly due to increased flexibility as a result of the different cell arrangement of the two strains. The differences in cell shape (spherical or rectangular) and arrangement (irregular or constant layered) of the two strains began to appear at lengths of 50 cm where the Sugwawon No. 301 strain had greater numbers of smaller cells than Huangguan No. 1. In addition we established six sequence simple repeats (SSR) genetic markers that clearly distinguish these two strains of S. japonica. Based on our observations, we speculate that differences in the cell arrangement between strains of S. japonica were determined by genetic variation and morphological properties of the two kelp strains. Keywords Saccharina japonica . Phaeophyceae . Cell shape and arrangement . Genetic difference
Introduction Production of Saccharina japonica has continuously increased since 2004 and 452,285 t wet weight was harvested in 2017 (MOF 2018) in Korea. The alga is used as a food, fertilizer, feed for abalone, and raw material for alginic acid, mannitol, and iodine extraction, as well as being used for offshore environmental restoration projects (Liu et al. 2014, Hwang et al. 2017). Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10811-019-02029-8) contains supplementary material, which is available to authorized users. * Chan Sun Park [email protected] 1
Aquatic Plant Variety Center, National Fisheries Research and Development Institute, Mokpo, Jeollanamdo 58746, South Korea
2
Department of Biological Sciences, Sungkyunkwan University, Gyeonggido 16419, South Korea
3
Department of Marine and Fisheries Resources, Mokpo National University, Muan, Jeollanamdo 58554, South Korea
The rapidly expanding abalone industry in Korea has a close association with the seaweed aquaculture industry (Hwang et al. 2009). Undaria pinnatifida and S. japonica have been used as live feed in the abalone farming industry, which has been expanding in the southern coast of Korea since the 2000s (Hwang et al. 2009). However, the natural growth period of these species is not long enough to supply food to the abalone year-round. Therefore, there
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