• Title, Summary, Keyword: Genetic Variation

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Genetic Variation in the Selected Populations of Hovenia dulcis var. koreana Nakai. Based on RAPD Analysis

  • Kim Sea-Hyun;Han Jin-Gyu;Chung Hun-Gwan;Cho Yoon-Jin;Park Hyung-Soon
    • Plant Resources
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    • v.8 no.3
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    • pp.293-299
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    • 2005
  • This study used RAPD markers to assume genetic diversity and variation in selected populations of Hovenia dulcis var. koreana. Ratio of polymorphic RAPD markers were 93.4% in selected populations of Hovenia dulcis Thunb., difference of genetic structure among populations and within populations showed 16.45%, 83.55%, respectively in amount of total genetic variation of 4 populations. Total gene diversity($H_T$) that show genetic diversity appeared 0.313 and coefficient of gene differentiation($G_{ST}$) that compare genetic differentiation of populations appeared 0.1645, analysis of AMOVA for variation among populations and within populations was significantly different (P<0.001). Genetic diversity of whole populations showed that 12.44% difference among population and 87.56% difference within populations. As a result, difference within populations was larger than difference among populations in genetic diversity. Nei's genetic distance and cluster analysis appeared that mean genetic distance among populations was 0.076, thus dividing two main groups and geographic relationship did not show in populations.

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Population Genetic Structure of Carassius auratus (Pisces: Cypriniformes) in South Korea Inferred from AFLP Markers: Discordance with Mitochondrial Genetic Structure

  • Jung, Jongwoo
    • Animal Systematics, Evolution and Diversity
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    • v.29 no.1
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    • pp.18-22
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    • 2013
  • A recent study on the mitochondrial genetic variation of the Carassius auratus population in South Korea suggested that there are 3 distinct mitochondrial lineages in the country, and that they are geographically separated between westward rivers and southward rivers, respectively. In this study, the population genetic structure of amplified fragment length polymorphism (AFLP) of Carassius auratus was investigated. The results of analysis of molecular variance (AMOVA) supported the geographic distinction between westward and southward river populations, but only 3.66% of total genetic variance lies among these populations. The panmicticity of the AFLP genetic variation is backed up by the results of the neighbor-joining dendrogram drawn from a linearized pairwise $F_{ST}$ matrix and Bayesian clustering analysis. The discordance of genetic structure between mitochondrial and AFLP genetic variation may come from difference in effective population size between these markers and/or gene flow between westward and southward river populations through river capture events.

Determination of Genetic Divergence Based on DNA Markers Amongst Monosporidial Strains Derived from Fungal Isolates of Karnal Bunt of Wheat

  • Seneviratne, J.M.;Gupta, Atul K.;Pandey, Dinesh;Sharma, Indu;Kumar, Anil
    • The Plant Pathology Journal
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    • v.25 no.4
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    • pp.303-316
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    • 2009
  • Genetic variation among the base isolates and monosporidial strains derived from these isolates of Tilletia indica- the causal agent of Karnal bunt (KB) in wheat, was analyzed by morphological, growth behaviors and RAPD-ISSR based molecular polymorphism. Genetic make up of fungal cultures vary among each other. The magnitude of variation in KBPN group is less (narrow genetic base) when compared to the other groups KB3, KB9 and JK (broad genetic base) reflecting that variability is a genetically governed process. The generation of new variation with different growth characteristics is not a generalized feature and is totally dependant on the original genetic make-up of the base isolate generating new monosporidial strains. Thus, it can be concluded that monosporidial strains derived from mono-teliosporic isolate, consists of genetically heterogeneous population. The morphological and genetic variability further suggests that the variation in T. indica strains is predominantly derived through the genetic rearrangements through para sexual means.

Heritability and Genetic Gains for Height Growth in 20-year-Old Korean White Pine in Korea

  • Shin, Man-Yong;Park, Hyung-Soon;Cho, Yoon-Jin;Chung, Dong-Jun
    • Korean Journal of Plant Resources
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    • v.19 no.6
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    • pp.677-679
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    • 2006
  • The objectives of this study were to examine the genetic variation of 20-year-old tree height and to estimate heritabilities and genetic gains of Korean white pine. Analysis of variance showed that families and family x block interaction had the significant (p=0.01) effects on tree height. However, family variation appears to be much greater than the variation due to family x block interaction. Individual tree heritability was higher ($h_I^2=0.73$) than family heritability, ($h_F^2=0.83$) therefore, combined selection showed the largest genetic gain (17.76%) in a given equal intensity of selection.

Genetic Diversity and Population Structure of Comus controversa Hemsley Using RAPD (RAPD에 의한 층층나무의 유전적 다양성과 집단구조)

  • Moon, Sung-Gi;Huh, Man-Kyu
    • Journal of Life Science
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    • v.18 no.2
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    • pp.175-179
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    • 2008
  • Cornus controversa is a long-lived woody species mostly distributed in East Asia. Random amplified polymorphic DNA (RAPD) markers were used to investigate the genetic diversity and population structure of Korean populations of this species. A high level of genetic variation was found in seven populations of C. controversa. The mean genetic diversity (H) was 0.222 across populations, varying from 0.200 to 0.238. Eighty of the 93 loci (86.0%) showed detectable polymorphism in at least one population. Total genetic diversity values ($H_T$) varied between 0.192 and 0.231, giving an average overall polymorphic loci of 0.212. The interlocus variation of genetic diversity within populations ($H_S$) was high (0.167). Mean of genetic diversity in C. controversa was higher than average values for species with similar life history traits. The sexual reproduction, perennial habitat, and longevity are proposed as possible factors contributing to high genetic diversity. On a per locus basis, the proportion of total genetic variation due to differences among populations ($G_{ST}$) ranged from 0.169 to 0.278 with a mean of 0.216, indicating that about 21.6% of the total genetic variation was among populations. An indirect estimate of the number of migrants per generation (Nm=1.893) indicated that gene flow was extensive among Korean populations of C. controversa.

Variation in Demography of Taraxacum officinale Seeds Harvested from Different Seasons

  • Yang, Hyo-Sik;Oh, Man-Ho
    • The Korean Journal of Ecology
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    • v.26 no.2
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    • pp.82-86
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    • 2003
  • We investigated the variation in adaptation to growth for four ecotypically-differentiated population of Taraxacum officinale found naturally in temporal environmental heterogeneity. Seeds collected from the four seasons were germinated in incubators and were grown for four months in greenhouse to test genetic variation among biotypes. Biotypes, segregated by seeds collected seasonally, were the part of natural population in Mokpo, South Korea. Each biotype was different in total dry weight of seeds, biomass, and leaf area, confirming previous finding. Differences between biotypes grown under a common environment indicated a genetic basis to their distinct demographic rates. Therefore, biotypes with similar annual rates of growth and contrasting seasonal rates should persist in the population. This differential response suggests that temporal variation in environment may be responsible, in part, for the maintenance of genetic variation within populations.

A molecular genetic study on the fruiting-body formation of Cordyceps militaris.

  • Wen, T.C.;Li, M.F.;Kang, J.C.;Lei, B.X.
    • 한국균학회소식:학술대회논문집
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    • pp.76-95
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    • 2009
  • In the fungal genus Cordyceps, the type species Cordyceps militaris produces bioactive ingredients and exhibits medicinal effects as a Traditional Chinese Medicine (TCM), The fruiting bodies of C.militaris have now been mass-produced artificially and used as functional food and medicine in China. The unstable variation in forming fruiting body is however a key restrictive factor in industrial production. The genetic study on in vitro stromata formation of C. militaris has rarely been carried out. Here, we report the effects of genetic variation including the mating system on perithecial stromata formation of C. militaris. Monoconidial isolates which have both MAT1-1-1 and MAT1-2-1(genotype MAT1-1/2) could produce stromata. While the isolates only have either MAT1-1-1 or MAT1-2-1 (genotype MAT1-1 or MAT1-2) failed to produce stromata. Despite obvious heterothallism, homothallism was occasionally observed in a few isolates of C. militaris. High genetic variation was observed amongst the different monoconidial isolates of C. militaris. The unstable variation or lose of fruiting body formation was found to be caused by the inner-species high genetic variation of C. militaris. These results also indicated that C. militaris sexually behaved as both heterothallic and homothallic and required two mating type compatible in the same culture in order to produce regular clubshaped perithecial stromata.

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A Preliminary Population Genetic Study of an Overlooked Endemic ash, Fraxinus chiisanensis in Korea Using Allozyme Variation

  • Lee, Heung Soo;Chang, Chin-Sung;Kim, Hui;Choi, Do Yeol
    • Journal of Korean Society of Forest Science
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    • v.98 no.5
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    • pp.531-538
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    • 2009
  • We used enzyme electrophoresis to evaluate genetic diversity in five populations of endemic ash, Fraxinus chiisanensis in Korea. Of 15 putative allozyme loci examined 26.7% were polymorphic and expected heterozygosity for the species was low (0.082). Within the range, population were highly differentiated ($F_{ST}$=0.356) and little genetic variation was explained by geography. The pattern of distribution of variation showed low genetic variation within populations and pronounced divergence among populations, which was consistent with the prediction for the effects of limited gene flow and local genetic erosion. Although the frequencies of male plants were dominant ranging from 79.3% to 89.4%, most mating events seems to be inevitable mating between relatives in small populations based on heterozygote deficiency of this species. Small effective population size and the limited dispersal contributed to the low rates of gene flow within as well as between populations.

Occurrence and identification of genetic variation and variation continuity in strawberry tissue culture caused by benzyladenine treatment (딸기 조직배양 시 BA (benzyladenine) 처리에 따른 변이 발생 및 변이 연속성 검정)

  • Kim, Hye Jin;Choi, Mi Ja;Lee, Jong Nam;Suh, Jong Taek;Kim, Ki Deog;Kim, Yul Ho;Hong, Su Young;Kim, Su Jeong;Sohn, Hwang Bae;Nam, Jeong Hwan
    • Journal of Plant Biotechnology
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    • v.47 no.1
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    • pp.46-52
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    • 2020
  • This experiment study aimed to identify the continuous genetic variation caused by benzyladenine (BA) treatment in strawberry tissue culture. The 'Goha' cultivar was used and treated with different concentrations of BA (0.0, 0.5, 1.0, 2.0 mg·L-1). Morphological and genetic variation tests were performed, and genetic continuity tests were performed for three years. The morphological variation induced by BA was distinctively high (10.5 ~ 20.0%) and the genetic variation was 7.0 ~ 15.0%, 1.8 ~ 10.0%, and 5.0% in the first, second, and third year of cultivation, respectively. The rate of genetic variation decreased with increasing cultivation years. In addition, genetic variation caused by BA 1.0 mg·L-1 and BA 2.0 mg·L-1 occurred in the first and second years of cultivation, whereas only BA 2.0 mg·L-1 caused genetic variation in the third year of cultivation. Therefore, a concentration of less than 1.0 mg·L-1 BA was used for the propagation of strawberry tissue culture plants, and it was necessary to identify their variation.

Genetic Variation and Genetic Relationship of Seventeen Chinese Indigenous Pig Breeds Using Ten Serum Protein Loci

  • Mo, D.L.;Liu, B.;Wang, Z.G.;Zhao, S.H.;Yu, M.;Fan, B.;Li, M.H.;Yang, S.L.;Zhang, G.X.;Xiong, T.A.;Li, K.
    • Asian-Australasian Journal of Animal Sciences
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    • v.16 no.7
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    • pp.939-945
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    • 2003
  • Seventeen Chinese indigenous pig breeds and three introduced pig breeds had been carried out by means of vertical polyacrylamide gel electrophoresis (PAGE). According to the results, eight serum protein loci were highly polymorphic except Pi-2 and Cp. The polymorphism information content (PIC) of Hpx was the highest (0.5268), while that of Cp was the lowest (0.0257). The population genetic variation index showed that about 84% genetic variation existed in the population, and the rest of 16% distributed between the populations. The genetic variation of Yimeng black pig and Duroc were the highest and the lowest, respectively. The genetic variation of Chinese indigenous pig breeds was much more than that of exotic groups. Genetic distance results showed that Chinese indigenous pig breeds were classified into four groups with the three introduced pig breeds clustered into another group. The results also supported the geographic distribution of Chinese indigenous pig breeds in certain extent.