• Title/Summary/Keyword: genetic research

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Spatial Genetic Structure of Allozyme Polymorphisms within a Small Population of Abies nephrolepis in Mt. Ohdae, South Korea

  • Lee, Seok-Woo;Yang, Byeong-Hoon;Lee, Kab Yeon;Song, Jeong Ho;Hur, Seong Doo;Lee, Jung Joo
    • Journal of Korean Society of Forest Science
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    • v.97 no.2
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    • pp.144-151
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    • 2008
  • Using 8 isozyme polymorphic loci as gene markers, we studied the spatial distribution of genotypes in a naturally regenerated uneven-aged Eastern Siberian Fir (Abies nephrolepis Max.) stand (1ha, $100{\times}100m$) on Mt. Ohdae in northeastern South Korea. Gregorius' distograms and Moran's I correlograms revealed no evidence of significant genetic structure at three spatial classes of 5 m, 10 m, and 20 m. Extensive gene flow, due to the long distance dispersal of pollen and seeds in A. nephrolepis, may account for the lack of fine-scale spatial structure. Alternatives would be overlapping seed shadows caused by high densities of A. nephrolepis adult trees (160 trees/ha) and/or intraspecific competition resulting in extensive thinning within maternal half-sib groups.

A Case of Superfetation in a Korean Native Cow (한우에서 중복임신 사례)

  • Son Dong-Soo;Kim Chong-Dae;Cho Chang-Yeon;Jin Hyun-Ju;Yeon Seong-Heum;Choe Chang-Yong;Choi Sun-Ho;Kim Hyun-Jong;Han Man-Hye;Kim Young-Kun
    • Journal of Veterinary Clinics
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    • v.23 no.2
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    • pp.207-210
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    • 2006
  • A probable case of superfetation in a Korean native cow met in a small farm located in Imsil Gun, Chonbuk. The cow delivered twice a living male and female calves in September 4 and December 9, 2004, respectively. Thus, we determined whether this case is a case of superfetation using parentage testing technique. The parentage testing was carried out for a dam and two calves using microsatellite DNA and blood typing. As the calves had at least one of the alleles on all marker tested that existed in dam, it was estimated that both of the calves were offsprings of the cow, and that they came from superfetation.

Molecular Identification and Effects of Temperature on Survival and Growth of Hybrids between Haliotis gigantea Gmelin (♀) and Haliotis discus hannai Reeve (♂)

  • An, Hye Suck;Han, Jong Won;Hwang, Hyun-Ju;Jeon, Hancheol;Jung, Seung-Hyun;Jo, Seonmi;Choi, Tae-Young;Hyun, Young Se;Song, Ha Yeun;Whang, Ilson
    • Journal of Marine Life Science
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    • v.2 no.2
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    • pp.83-89
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    • 2017
  • In abalones, interspecific hybridization has been suggested as a possible means to increase production and desired traits for the industry. In Korea, Haliotis gigantea is considered a species with a larger size and higher temperature tolerance than H. discus hannai. However, H. discus hannai is considered the most valuable and popular fishery resource due to its better acceptance and higher market prices. Thus, viable interspecific hybrids have been produced by artificial inseminating H. gigantea eggs with H. discus hannai sperm. However, the reciprocal hybrid cross was not successful. In this study, the hybridity and the growth and thermal tolerance performance of the interspecific hybrids were examined. A combination of various assays revealed maximum growth occurrence at 21℃ and the higher growth rate in the hybrids than that of H. discus hannai parent. In addition, the growth and survival at high-temperature (28℃) of the hybrids was equivalent to that of the highly tolerant H. gigantea parent, suggesting new possibilities to overcome the mass mortality in H. discus hannai during high temperature periods of summer season in Korea. Furthermore, the induced interspecific hybrid status was confirmed by the presence of species-specific bands for each parental species of the random amplified polymorphic DNA (RAPD) profiles using universal rice primer (URP), which could be used as speciesspecific markers to distinguish the hybrids and their parental species.