• 한국작물학회지
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• 제49권5호
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• pp.429-433
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• 2004

A single recessive gene, rxp, controls the bacterial leaf pustule (BLP) resistance in soybean and in our previous article, it has been mapped on linkage group (LG) D2 of molecular genetic map of soybean. A total of 130 recombinant inbred lines (RILs) from a cross between BLP-resistant SS2-2 and BLP-susceptible Jangyeobkong were used to identify molecular markers linked to rxp. Fifteen simple sequence repeat (SSR) markers on LG D2 were screened to construct a genetic map of rxp locus. Only four SSR markers, Satt135, Satt372, Satt448, and Satt486, showed parental polymorphisms. Using these markers, genetic scaffold map was constructed covering 26.2cM. Based on the single analysis of variance, Satt372 among these four SSR markers was the most significantly associated with the resistance to BLP. To develop new amplified fragment length polymorphism (AFLP) marker linked to the resistance gene, bulked segregant analysis (BSA) was employed. Resistance and susceptible bulks were made by pooling equal amount of genomic DNAs from ten of each in the segregating population. A total of 192 primer combinations were used to identify specific bands to the resistance, selecting three putative AFLP markers. These AFLP markers produced the fragment present in SS2-2 and the resistant bulk, and not in Jangyeobkong and the susceptible bulk. Linkage analysis revealed that McctEact97 $(P=0.0004,\;R^2=14.67\%)$ was more significant than Satt372, previously reported as the most closely linked marker.

• Mycobiology
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• 제47권4호
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• pp.527-532
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• 2019

We designed 170 new simple sequence repeat (SSR) markers based on the whole-genome sequence data of button mushroom (Agaricus bisporus), and selected 121 polymorphic markers. A total of 121 polymorphic markers, the average major allele frequency (M_AF) and the average number of alleles (N_A) were 0.50 and 5.47, respectively. The average number of genotypes (N_G), observed heterozygosity (H_O), expected heterozygosity (H_E), and polymorphic information content (PIC) were 6.177, 0.227, 0.619, and 0.569, respectively. Pearson's correlation coefficient showed that M_AF was negatively correlated with N_G (-0.683), N_A (-0.600), H_O (-0.584), and PIC (-0.941). N_G, N_A, H_O, and PIC were positively correlated with other polymorphic parameters except for M_AF. UPGMA clustering showed that 26 A. bisporus accessions were classified into 3 groups, and each accession was differentiated. The 121 SSR markers should facilitate the use of molecular markers in button mushroom breeding and genetic studies.

• 원예과학기술지
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• 제34권1호
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• pp.142-153
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• 2016

국내외에서 재배되고 있는 감귤속 식물 108 품종 및 유전자원과 SSR 마커를 활용하여 유전적 유사도 분석을 통한 품종식별력 검정 등에 대한 연구를 수행하였다. 감귤 8품종을 203개의 SSR 마커로 검정하여 반복 재현성이 높은 뿐만 아니라 다형성 정도가 높은 18개를 선정하였다. 이들 마커와 국내외에서 재배되고 있는 감귤 108품종을 검정하였을 때 마커당 평균 대립유전자수는 9.28개로 나타났고, 5-14개까지 다양한 분포를 나타내었다. PIC 값은 분자표지에 따라 0.417-0.791 범위에 속하였으며 평균값은 0.606으로 나타났다. 감귤류 108품종에 대하여 계통도를 작성하였을 때 감귤류 식물의 분류학적 특성 및 품종 육성의 계보도에 따라 13개의 그룹으로 크게 나누어졌다. 감귤류 식물 품종중 오렌지나 온주 밀감의 경우 대부분의 품종이 SSR 마커의 유전자형에 의해 구분이 되지 않은 것으로 나타났다. 본 연구에서 개발된 감귤속 식물의 품종별 SSR DNA 프로파일 데이터베이스는 감귤속 식물의 유전자원 특성평가와 육종가의 지식재산권 보호의 수단으로 유용하게 활용될 수 있을 것이다.

• 원예과학기술지
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• 제31권3호
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• pp.337-343
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• 2013

본 연구의 목적은 SSR과 SRAP 마커 시스템을 이용하여 팔레놉시스 14품종 간 유전적 거리를 비교하고, SSR 마커를 이용하여 품종 간 구분을 하기 위한 것이다. 전체적으로 111개의 SSR 프라이머와 30조합의 SRAP primer를 먼저 스크리닝하였다. 국립원예특작과학원에서 보존중인 국내 육성품종을 포함한 14품종의 팔레놉시스에서 12개의 SSR 프라이머와 30조합의 SRAP 프라이머에서 높은 다형성을 보였다. 증폭된 DNA 단편들은 acrylamide gel에서 분리시킨 후 silver staining 방법으로 검출하였다. SSR 마커 55개와 SRAP 419개로, 총 474개의 마커를 획득하였으며 이를 유전적 다양성 분석에 사용하였다. 다형성 밴드들은 MVSP 3.1프로그램을 이용하여 유전적 유사도와 UPGMA clustering 분석을 위해 scoring 되었다. 14 팔레놉시스 품종은 SRAP과 SSR 분석을 통해 각각 0.683과 0.66의 유사도 지수에서 3그룹으로 분류되었다. 또한 SSR 20번과 22번만으로도 이들 육성 품종을 구분할 수 있었다. 이 결과는, SSR 분석은 팔레놉시스 품종간 구분에 효과적이고 SRAP은 염기서열의 정보가 없을 때 유전적 다양성 분석에 유용하다는 것을 보여준다. 이번 연구된 SSR과 SRAP 마커들은 팔레놉시스의 유전자형 판별, 유전자원 보존, 유전적 근연관계를 분석하는데 유용한 기술이 될 것이다.

• Mycobiology
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• 제47권4호
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• pp.466-472
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• 2019

For the purpose of protecting the rights of Lentinula edodes breeders, we developed a new simple sequence repeat (SSR) marker set consisting only of genetically independent tetranucleotide or longer core motifs. Using available genome sequences for five L. edodes strains, we designed primers for 13 SSR markers that amplified polymorphic sequences in 20 L. edodes cultivars. We evaluated the independence of every possible marker pair based on genotype data. Consequently, eight genetically independent markers were selected. The polymorphic information content values of the markers ranged from 0.269 to 0.764, with an average of 0.409. The markers could distinguish among 20 L. edodes cultivars and produced highly repeatable and reproducible results. The markers developed in this study will enable the precise identification of L. edodes cultivars, and may be useful for protecting breeders' rights.

• 한국육종학회지
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• 제42권1호
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• pp.11-22
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• 2010

The population structure of a domesticated species is influenced by the natural history of the populations of its pre-domesticated ancestors, as well as by the breeding system and complexity of breeding practices implemented by humans. In the genetic and population structure analysis of 122 South Asia collections using 29 simple sequence repeat (SSR) markers, 362 alleles were detected, with an average of 12.5 per locus. The average expected heterozygosity and polymorphism information content (PIC) for each SSR locus were 0.74 and 0.72,respectively. The model-based structure analysis revealed the presence of three clusters with the 91.8% (shared > 75%) membership, with 8.2% showing admixture. The genetic distances of Clusters 1-3 were 0.55, 0.56, and 0.68, respectively. Polymorphic information content followed the same trend (Cluster 3 had the highest value and Cluster 1 had smallest value), with genetic distances for each cluster of 0.52, 0.52, and 0.65, respectively. This result could be used for supporting rice breeding programs in South Asia countries.

• 한국작물학회지
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• 제48권1호
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• pp.56-64
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• 2003

If a quantitative trait loci (QTL) marker identified in a population is applicable to different populations (marker universality), this will not only reduce the labor and cost in marker assisted selection (MAS), but accelerate the application of molecular markers to real breeding programs. Present study aims to evaluate the defined QTL related markers from a population to a different breeding population for the MAS. Four rice breeding populations were subjected to seventy-five simple sequence repeat (SSR) markers which were already identified for their polymorphism information content (PIC) in the parents of the crossings. Among them, eight markers were evaluated for their correlation between presence of marker alleles and phenotypic expression in breeding populations. A reasonable level of polymorphism for the mapped markers originated from any sources of rice accessions was observed between crosses of any sources (marker repeatability). However, correlation between presence of markers and expression of the traits in rice breeding populations was not significant except for minor portion of traits and markers examined (failure of marker universality). In the present study, various strategies were discussed to develop new markers with universality of breeding application.

• Mycobiology
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• 제46권4호
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• pp.421-428
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• 2018

The white button mushroom (Agaricus bisporus) is one of the most widely cultivated species of edible mushroom. Despite its economic importance, relatively little is known about the genetic diversity of this species. Illumina paired-end sequencing produced 43,871,558 clean reads and 69,174 contigs were generated from five offspring. These contigs were subsequently assembled into 57,594 unigenes. The unigenes were annotated with reference genome in which 6,559 unigenes were associated with clusters, indicating orthologous genes. Gene ontology classification assigned many unigenes. Based on genome data of the five offspring, 44 polymorphic simple sequence repeat (SSR) markers were developed. The major allele frequency ranged from 0.42 to 0.92. The number of genotypes and the number of alleles ranged from 1 to 4, and from 2 to 4, respectively. The observed heterozygosity and the expected heterozygosity ranged from 0.00 to 1.00, and from 0.15 to 0.64, respectively. The polymorphic information content value ranged from 0.14 to 0.57. The genetic distances and UPGMA clustering discriminated offspring strains. The SSR markers developed in this study can be applied in polymorphism analyses of button mushroom and for cultivar discrimination.

• 식물분류학회지
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• 제48권3호
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• pp.195-200
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• 2018

Genetic assessments of rare and endangered species are among the first steps necessary to establish the proper management of natural populations. Transcriptome-derived single-sequence repeat markers were developed for the Korean endangered species Astilboides tabularis (Saxifragaceae) to assess its genetic diversity. A total of 96 candidate microsatellite loci were isolated based on transcriptome data using Illumina pair end sequencing. Of these, 26 were polymorphic, with one to five alleles per locus in 60 individuals from three populations of A. tabularis. The observed and expected heterozygosity per locus ranged from 0.000 to 0.950 and from 0.000 to 0.741, respectively. These polymorphic transcriptome-derived simple sequence repeat markers would be invaluable for future studies of population genetics and for ecological conservation of the endangered species A. tabularis.

• 한국산림과학회지
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• 제87권3호
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• pp.422-428
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• 1998

구상나무 개체목으로부터 채취한 48개의 배유조직을 이용해서 PCR 방법에 의해 생성된 inter-simple sequence repeats(I-SSR) 표지자를 분석했다. 예비실험에서 6개의 배유조직을 이용해서 35개의 primer를 검색했으며, 그들 중에서 PCR 반응이 가장 잘되는 19개 primer를 선정해서 48개 배유조직을 이용한 본 실험에 사용했다. 카이자승 검정 결과, 19개 primer에 의해 증폭된 51개의 증폭산물이 5% 유의 수준에서 멘델의 분리비(1:1)에 따라 차대에 유전됨을 확인할 수 있었다. 멘델 유전자좌로 확인된 51개 표지자들의 게놈내 분포양상을 확인하기 위해서 연관분석을 수행한 결과, 51개 유전자좌들이 상호간에 서로 연관되어있지 않은 것으로 확인되어 이들이 전체 게놈상에 고르게 분포하고 있음을 확인할 수 있었다. 본 연구에서 관찰된 51개 유전자좌들이 게놈상에 고르게 분포하고 있다는 특성 때문에 게놈상의 특정부위에 편중되지 않은 유전정보를 얻을 수 있다는 장점이 있다. 즉, 기존의 RAPD 표지자들 중 상당수가 독립적인 연관군을 형성하는 것으로 알려져 있기 때문에 이들 연관군이 위치한 특정 부위의 DNA를 증폭하여 분석하는 RAPD 표지자에 비해서 I-SSR 표지자들이 유전 다양성을 추정하는데 더 유용한 표지자로 활용될 수 있을 것으로 생각되며, 이들 표지자들이 독립적인 진화의 과정을 겪을 것으로 기대되기 때문에 cladistic 방법에 의해 진화적 유연관계를 추정하는데 더 적합한 표지자로 생각된다.