Comparison of genetic diversity structure analyses of SSR molecular marker data within apple (Malus × domestica) genetic resources

Genome ◽  
2012 ◽  
Vol 55 (09) ◽  
pp. 647-665 ◽  
Author(s):  
Josef Patzak ◽  
František Paprštein ◽  
Alena Henychová ◽  
Jiří Sedlák
Keyword(s):  
Genetic Diversity ◽  
Cluster Analysis ◽  
Genetic Resources ◽  
Malus Domestica ◽  
Germplasm Collection ◽  
Molecular Data ◽  
Model Based ◽  
Ssr Loci ◽  
Breeding History ◽  
Diversity Structure

The aim of this study was to compare traditional hierarchical clustering techniques and principal coordinate analysis (PCoA) with the model-based Bayesian cluster analyses in relation to subpopulation differentiation based on breeding history and geographical origin of apple (Malus × domestica Borkh.) cultivars and landraces. We presented the use of a set of 10 microsatellite (SSR) loci for genetic diversity structure analyses of 273 apple accessions from national genetic resources. These SSR loci yielded a total of 113 polymorphic SSR alleles, with 5–18 alleles per locus. SSR molecular data were successfully used in binary and allelic input format for all genetic diversity analyses, but allelic molecular data did not reveal reliable results with the NTSYS-pc and BAPS softwares. A traditional cluster analysis still provided an easy and effective way for determining genetic diversity structure in the apple germplasm collection. A model-based Bayesian analysis also provided the clustering results in accordance to traditional cluster analysis, but the analyses were distorted by the presence of a dominant group of apple genetic resources owing to the narrow origin of the apple genome. PCoA confirmed that there were no noticeable differences in genetic diversity structure of apple genetic resources during the breeding history. The results of our analyses are useful in the context of enhancing apple collection management, sampling of core collections, and improving breeding processes.

KERAGAMAN FENOTIPE DAN GENETIK TIGA VARIETAS KELAPA GENJAH KOPYOR ASAL PATI JAWA TENGAH

2016 ◽  
Vol 21 (1) ◽  
pp. 1 ◽  
Author(s):  
ISMAIL MASKROMO ◽  
ELSJE T. TENDA ◽  
MEITY A. TULALO ◽  
HENGKY NOVARIANTO ◽  
DEWI SUKMA ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Cluster Analysis ◽  
Molecular Biology ◽  
Plant Molecular Biology ◽  
Morphological Diversity ◽  
Local Varieties ◽  
Central Java ◽  
Variety Selection ◽  
Ssr Loci ◽  
Biology Laboratory

<p>ABSTRAK<br />Kelapa Genjah kopyor asal Pati, Jawa Tengah merupakan<br />kekayaaan hayati asli Indonesia dengan nilai ekonomi tinggi. Informasi<br />keragaman genetik kelapa kopyor masih terbatas. Data keragaman<br />morfologi dan genetik diperlukan dalam program pemuliaan kelapa<br />kopyor. Penelitian ini mempelajari keragaman tiga varietas kelapa genjah<br />kopyor asal Pati yang telah dilepas berdasarkan karakter morfologi,<br />kuantitas endosperma, dan keragaman alel marka SSR. Penelitian<br />dilakukan di Pati dan di Laboratorium Plant Molecular Biology,<br />Departemen Agronomi dan Hortikultura, IPB. Evaluasi dilakukan terhadap<br />tiga populasi kelapa Genjah kopyor (hijau, coklat, dan kuning) dengan 30<br />tanaman sampel untuk setiap populasi. Rataan data morfologi digunakan<br />untuk menyusun dendogram. Kuantitas endosperma diamati pada satu<br />buah kelapa kopyor per tanaman yang dievaluasi. Karakteristik<br />endosperma dikelompokkan sesuai kategori yang telah ditetapkan. Untuk<br />setiap populasi, analisis marka dengan lima pasang primer SSR dilakukan<br />pada 10 tanaman sampel. Data yang didapat digunakan untuk menentukan<br />keragaman genetik kelapa Genjah kopyor asal Pati. Hasil pengamatan<br />menunjukkan keragaman morfologis dan alel SSR antar tanaman dalam<br />varietasnya (keragaman intra-varietas) rendah. Sebaliknya, keragaman<br />morfologis dan alel SSR antar varietasnya tinggi. Kuantitas endosperma<br />kelapa Genjah kopyor asal Pati bervariasi antara skor 1–6. Keragaman<br />genetik yang rendah dalam varietas dan tinggi antar ketiga varietas (coklat,<br />hijau, dan kuning) memperkuat pelepasan ketiganya sebagai varietas lokal.<br />Selain itu, keragaman genetik antar tanaman dalam varietas yang rendah<br />mendukung penggunaan ketiga varietas lokal sebagai tetua dalam program<br />perakitan varietas kelapa kopyor unggul baru. Tetua yang dipilih dapat<br />diseleksi intra-varietas berdasarkan persentase buah kopyor per tandan<br />dan skor kuantitas endosperma yang tinggi.<br />Kata kunci: Keragaman morfologis, keragaman intra dan antar varietas,<br />kuantitas endosperma</p><p>ABSTRACT<br />Kopyor dwarf coconuts are mutants from Pati, Central Java having<br />high economic values. However, morphological and genetic diversities of<br />this coconut were still limited. Morphological and genetic diversity data<br />are needed for breeding program. The research objectives were to evaluate<br />intra and inter-specific diversity based on morphology, endosperm<br />quantity, and SSR alleles. Field evaluations were conducted in Pati while<br />laboratory activities were at Plant Molecular Biology Laboratory,<br />Department of Agronomy and Horticulture, IPB. Three populations of<br />kopyor dwarf varieties (brown, green, and yellow) were evaluated. Thirty<br />trees were sampled for each population. The average of morphological<br />data were used to construct cluster analysis. Endosperm quantity was<br />scored (0 – 9) based on a single nut sample. Ten palms were analyzed<br />using five SSR loci for each population and used to determine genetic<br />diversity of populations. Results of observations indicated intra-variety<br />morphological and SSR allele variations among kopyor dwarf was low.<br />However, inter-variety variations were high. The endosperm quantity<br />scores among kopyor dwarf coconut ranged from 1–6. The low intra-<br />variety and high inter-variety variations among the three kopyor dwarf<br />coconut supported their release as different local varieties. Moreover, the<br />low intra-variety phenotypic and genotypic diversities among kopyor<br />brown, green, and yellow dwarf coconut support their use as parents for<br />new and superior kopyor coconut variety development in the future. For<br />such purpose, however, it is necessary to conduct intra-variety selection to<br />identify desirable parents based on high kopyor fruit percentage per bunch<br />and for high kopyor endosperm quantity.<br />Key words: Morphological diversity, intra and inter variety diversities,<br />quantity, endosperm</p>

Genetic diversity of loquat germplasm (Eriobotrya japonica (Thunb) Lindl) assessed by SSR markers

Genome ◽  
2005 ◽  
Vol 48 (1) ◽  
pp. 108-114 ◽  
Author(s):  
José Miguel Soriano ◽  
Carlos Romero ◽  
Santiago Vilanova ◽  
Gerardo Llácer ◽  
María Luisa Badenes
Keyword(s):  
Genetic Diversity ◽  
Ssr Markers ◽  
Malus Domestica ◽  
Genetic Relationships ◽  
Germplasm Collection ◽  
Mean Value ◽  
Eriobotrya Japonica ◽  
Fixation Index ◽  
Group Method ◽  
Malus Domestica Borkh

Genetic relationships among 40 loquat (Eriobotrya japonica (Thunb) Lindl) accessions that originated from different countries and that are part of the germplasm collection of the Instituto Valenciano de Investigaciones Agrarias (IVIA) (Valencia, Spain) were evaluated using microsatellites. Thirty primer pairs flanking microsatellites previously identified in Malus × domestica (Borkh.) were assayed. Thirteen of them amplified polymorphic products and unambiguously distinguished 34 genotypes from the 40 accessions analyzed. Six accessions showing identical marker patterns were Spanish local varieties thought to have been derived from 'Algerie' by a mutational process very common in loquat species. A total of 39 alleles were detected in the population studied, with a mean value of 2.4 alleles per locus. The expected and observed heterozygosities were 0.46 and 51% on average, respectively, leading to a negative value of the Wright's fixation index (–0.20). The values of these parameters indicate a smaller degree of genetic diversity in the set of loquat accessions analyzed than in other members of the Rosaceae family. Unweighted pair-group method (UPGMA) cluster analysis, based on Nei's genetic distance, generally grouped genotypes according to their geographic origins and pedigrees. The high number of alleles and the high expected heterozygosity detected with SSR markers developed in Malus × domestica (Borkh.) make them a suitable tool for loquat cultivar identification, confirming microsatellite marker transportability among genera in the Rosaceae family.Key words: Eriobotrya japonica, SSR markers, microsatellites, genetic diversity.

scholarly journals Genetic diversity detection of seed-propagated walnut (Juglans regia L.) germplasm from Eastern Anatolia using SSR markers

2020 ◽  
Vol 32 (1) ◽  
pp. 37-46
Author(s):  
Emine Orhan ◽  
Sadiye Peral Eyduran ◽  
Danijela Poljuha ◽  
Meleksen Akin ◽  
Tim Weber ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Resources ◽  
Ssr Markers ◽  
Phenotypic Variability ◽  
Juglans Regia ◽  
Molecular Data ◽  
Fruit Weight ◽  
Morphological And Molecular Data ◽  
Bud Breaking ◽  
Seed Propagation

AbstractContinuous seed propagation in Turkey has given rise to a great number of seedling walnut trees which represents valuable walnut genetic resources. The number of native walnut trees is estimated to be over 5 million in Turkey and they possess large phenotypic variability in yield, nut and kernel characteristics, late bud breaking, late flowering, winter hardiness and tolerance to diseases. Progress in walnut breeding requires the exploitation of genetic variation among cultivars and landraces. In this study, we used 32 local diverse walnut genotypes obtained from seeds and 2 standard cultivars (‘Sebin’ and ‘Bilecik’). This study implemented 21 previously used simple sequence repeats (SSR) markers to determine genetic diversity. The analysis revealed 135 alleles with an average of 6.43 alleles per locus. Genetic similarity ranged from 0.23 (for samples KW22 and KW29) to 0.87 (for samples KW27 and KW28). The highest number of alleles per locus was obtained from WGA276 locus (11 alleles), followed by WGA054 (9 alleles), WGA202 and WGA321 (8 alleles) while the lowest number was detected in WGA027. According to the morphological and molecular data, the genotypes differed from each other and the cvs. Sebin and Bilecik. The majority of the genotypes had higher fruit weight and some of the genotypes had higher kernel ratio than cvs. Sebin and Bilecik implying the importance of registering genotypes as cultivars. This research provides information on the genetic relationship of walnut genotypes and cultivars and emphasises the importance of protection and utilisation of seed-propagated walnut genetic resources.

scholarly journals Molecular Analysis of Genetic Diversity and Geographic Origin within an Ex Situ Germplasm Collection of Cherimoya by Using SSRs

2007 ◽  
Vol 132 (3) ◽  
pp. 357-367 ◽  
Author(s):  
P. Escribano ◽  
M.A. Viruel ◽  
J.I. Hormaza
Keyword(s):  
Genetic Diversity ◽  
Geographic Origin ◽  
Germplasm Collection ◽  
Ex Situ ◽  
Group Method ◽  
Pair Group ◽  
Ssr Primers ◽  
Upgma Cluster Analysis ◽  
Ssr Loci ◽  
Simple Sequence

Cherimoya (Annona cherimola Mill.) is an underused fruit crop with a clear niche for expansion in subtropical climates. In this study, 16 simple sequence repeat (SSR) loci were used to find molecular polymorphisms among 279 cherimoya accessions from a worldwide ex situ field germplasm collection. A total of 79 amplification fragments were amplified with 16 pairs of SSR primers, with an average of 4.9 bands/SSR. Mean expected and observed heterozygosities averaged 0.53 and 0.44, respectively. The total value for the probability of identity was 4.34 × 10−8. The SSRs studied resulted in 267 different fingerprinting profiles, of which 258 were unique genotypes; the rest were putative cases of synonymies or mislabeling errors. Unweighted pair group method with arithmetic averages (UPGMA) cluster analysis indicated the relationships among the analyzed accessions, showing some specific groups related to their geographical origins. Analysis of molecular variance (AMOVA) was performed to examine the distribution of genetic variation of the 148 accessions collected from putative cherimoya origin areas in Ecuador and Peru, showing that the major variations occurred within valleys in each country. The results confirmed the usefulness of microsatellites for identification of genetic diversity and geographic origin of cherimoya and are discussed in terms of their implications for ex situ conservation of cherimoya genetic resources.

scholarly journals Implementation of a limited set of SSR markers for screening of genetic variability in Latvian and Swedish sour cherry (Prunus cerasus L.) genetic resources collections

2011 ◽  
Vol 65 (1-2) ◽  
pp. 21-28
Author(s):  
Gunārs Lācis ◽  
Isaak Rashal ◽  
Viktor Trajkovski
Keyword(s):  
Genetic Diversity ◽  
Genetic Variability ◽  
Genetic Resources ◽  
Ssr Markers ◽  
Genetic Similarity ◽  
Polymorphic Information Content ◽  
Sour Cherry ◽  
Prunus Cerasus ◽  
Discrimination Power ◽  
Ssr Loci

Implementation of a limited set of SSR markers for screening of genetic variability in Latvian and Swedish sour cherry (Prunus cerasusL.) genetic resources collectionsForty-one sour cherry (Prunus cerasusL.) accessions were evaluated using three SSR markers to characterise genetic diversity in the sour cherry genetic resource collections at the Latvia State Institute of Fruit-Growing (LIFG), Dobele, Latvia and the Division of Horticultural Genetics and Plant Breeding at Balsgård, Department of Crop Sciences, Swedish University of Agricultural Sciences (SLU-Balsgård), Sweden, and to test the usability and reliability of a small set of SSR markers for preliminary characterisation of sour cherry germplasm collections. The SSR loci were highly polymorphic with 7-14 alleles per locus. Heterozygosity and Polymorphic Information Content values ranged from 0.750 to 1.000 and 0.748-0.899, respectively, while discrimination power per locus varied from 0.716 to 0.965. Five to thirty genotypes were found in the sour cherry collections for the three tested SSR loci. The combined discrimination power of all loci was effectively 0.994 and 0.999 for the LIFG and SLU-Balsgård collections, respectively. The SSRs used were able to uniquely identify all accessions in the analysed genetic resources collections. The genotype data allowed estimation of genetic diversity and genetic characterisation of accessions in the collections. Genetic similarity analysis showed higher genetic similarity among the Baltic and Scandinavian sour cherry varieties, than between Baltic and Eastern European varieties.

scholarly journals Microsatellite Markers Developed from `Bluecrop' Reveal Polymorphisms in the Genus Vaccinium and Are Suitable for Cultivar Fingerprinting

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1122B-1122 ◽  
Author(s):  
Peter Boches ◽  
Lisa J. Rowland ◽  
Kim Hummer ◽  
Nahla V. Bassil
Keyword(s):  
Genetic Diversity ◽  
Cluster Analysis ◽  
Genetic Distance ◽  
Microsatellite Markers ◽  
Genetic Relationships ◽  
Distance Measures ◽  
Hybrid Origin ◽  
Pedigree Information ◽  
Species Relationships ◽  
Ssr Loci

Microsatellite markers for blueberry (Vaccinium L.) were created from a preexisting blueberry expressed sequence tag (EST) library of 1305 sequences and a microsatellite-enriched genomic library of 136 clones. Microsatellite primers for 65 EST-containing simple sequence repeats (SSRs) and 29 genomic SSR were initially tested for amplification and polymorphism on agarose gels. Potential usefulness of these SSRs for estimating species relationships in the genus was assessed through cross-species transference of 45 SSR loci and cluster analysis using genetic distance values from five highly polymorphic EST-SSR loci. Cross-species amplification for 45 SSR loci ranged from 17% to 100%, and was 83% on average in nine sections. Cluster analysis of 59 Vaccinium species based on genetic distance measures obtained from 5 EST-SSR loci supported the concept of V. elliotii Chapm. as a genetically distinct diploid highbush species and indicated that V. ashei Reade is of hybrid origin. Twenty EST-SSR and 10 genomic microsatellite loci were used to determine genetic diversity in 72 tetraploid V. corymbosum L. accessions consisting mostly of common cultivars. Unique fingerprints were obtained for all accessions analyzed. Genetic relationships, based on microsatellites, corresponded well with known pedigree information. Most modern cultivars clustered closely together, but southern highbush and northern highbush cultivars were sufficiently differentiated to form distinct clusters. Future use of microsatellites in Vaccinium will help resolve species relationships in the genus, estimate genetic diversity in the National Clonal Germplasm Repository (NCGR) collection, and confirm the identity of clonal germplasm accessions.

scholarly journals Genetic Diversity and Population Structure of Job’s Tears(Coix lacryma-jobi L.) Germplasm Based on ISSR Marker

2021 ◽  
Author(s):  
Gang Shen ◽  
Lingling Yang ◽  
Teerayoot Girdthai ◽  
Fanzhi Liu ◽  
Yuhua Fu ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Cluster Analysis ◽  
Population Structure ◽  
Genetic Distance ◽  
Genetic Relationship ◽  
Germplasm Collection ◽  
Issr Markers ◽  
Issr Primer ◽  
Upgma Cluster ◽  
Job’S Tears

Abstract Background: Job's tears（Coix lachryma-jobi L.）is a minor cereal and an important food item in some parts of Asia. It has also been used in the traditional Chinese medicine for relieving various ailments, therefore, it plays an important role in our lives. Lack of excellent new varieties hinders the development of coix as a sustainable crop, and it is urgent to provide new cultivars with excellent trait in Chinese Coix industry. Results: ISSR markers were used to assess the genetic diversity and population structure of 8 populations of Job’s tears in China. A genotyping analysis that utilized ten ISSR primer pairs resulted in the production of 116 bands, of which 98 were polymorphic. The Guizhou population (PPB = 81.90%, h = 0.3113, I = 0.4589) was the most genetically diverse, while the lowest was observed in the Hebei population (PPB = 46.55%, h = 0.1842, I = 0.2701). Genetic differentiation analyses including GST and AMOVA illustrated that genetic variation was most prevalent within populations while only minor variations were observed among populations. Genetic distance coefficients ranged from 0.0095 to 0.0948 for the 8 populations; the genetic relationship between the Guizhou and Chongqing populations was the closest, while the most distant genetic relationship occurred between the Hubei and Hunan populations. The results of an UPGMA cluster analysis that investigated genetic diversity among the populations were consistent with the genetic distance results. The results of a STRUCTURE analysis suggested that 94 Job’s tears accessions could be grouped into two subpopulations. Moreover, according to a cluster analysis based on the UPGMA for individuals of Job’s tears, accessions were divided into two major clusters. The results of the Bayesian cluster and UPGMA cluster analyses were largely consistent despite minor differences. There was no significant correlation between genetic distance and geographic distance (r = 0.055, p = 0.782). Conclusions: Our study was undertaken to systematically analyze genetic diversity and population structure in 94 Job’s tears accessions using ISSR markers. And this study provides us with valuable information pertaining to germplasm collection, genetic improvement, and systematic utilization of Job’s tears.

scholarly journals Genetic diversity in pearl millet restorers based on seed vigour traits and SSR markers

2020 ◽  
Vol 49 (2) ◽  
pp. 357-365
Author(s):  
Hemender Tanwar ◽  
Shikha Yashveer ◽  
Vijay Pal Sangwan ◽  
Sushma Sharma ◽  
Sonali Sangwan ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Cluster Analysis ◽  
Pearl Millet ◽  
Polymorphic Information Content ◽  
Molecular Data ◽  
Neighbor Joining ◽  
Initial Screening ◽  
Seedling Vigour ◽  
Seed Vigour ◽  
Early Seedling

Thirty four pearl millet restorer lines were evaluated on the basis of nine seed vigour traits and molecular analysis was done with 55 SSRs to study the genetic divergence among them. Cluster analysis based on seed vigour parameters revealed the considerable amount of variability and all genotypes were divided into six clusters. Furthermore, a set of 39 SSRs, selected after initial screening of 55, amplified 226 alleles with a mean of 5.84 alleles per locus. The highest polymorphic information content (PIC) value obtained was for PSMP 2084 (0.88) with a range of 0 to 0.88 and average PIC of 0.558. Neighbor joining tree based on molecular data differentiated all the genotypes into two major groups. The grouping based on both approaches can help breeders to use the studied material in further breeding for improvement of germination potential and early seedling vigour of pearl millet.

scholarly journals Examination of Genetic Diversity of Common Bean from the Western Balkans

2015 ◽  
Vol 140 (4) ◽  
pp. 308-316 ◽  
Author(s):  
Marko Maras ◽  
Barbara Pipan ◽  
Jelka Šuštar-Vozlič ◽  
Vida Todorović ◽  
Gordana Đurić ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Cluster Analysis ◽  
Common Bean ◽  
Gene Pool ◽  
Molecular Data ◽  
Gene Pools ◽  
Western Balkans ◽  
Mesoamerican Gene Pool ◽  
Information Index ◽  
Large Clusters

In this study, genetic diversity of 119 accessions of common bean (Phaseolus vulgaris) from five former Yugoslav republics constituting the western Balkans was assessed by 13 microsatellite markers. This set of markers has proven before to efficiently distinguish between bean genotypes and assign them to either the Andean or the Mesoamerican gene pool of origin. In this study, 118 alleles were detected or 9.1 per locus on average. Four groups (i.e., Slovene, Croatian, Bosnian, and Serbian) showed similarly high levels of genetic diversity as estimated by the number of different alleles, number of effective alleles, Shannon’s information index, and expected heterozygosity. Mildly narrower genetic diversity was identified within a group of Macedonian accessions; however, this germplasm yielded the highest number of private alleles. All five germplasms share a great portion of genetic diversity as indicated by the analysis of molecular variance (AMOVA). On the basis of the scored number of migrants, we concluded that the most intensive gene flow in the region exists in Bosnia and Herzegovina. Cluster analysis based on collected molecular data classified the accessions into two large clusters that corresponded to two gene pools of origin (i.e., Andean and Mesoamerican). We found that Andean genotypes are more prevalent than Mesoamerican in all studied countries, except Macedonia, where the two gene pools are represented evenly. This could indicate that common bean was introduced into the western Balkans mainly from the Mediterranean Basin. Bayesian cluster analysis revealed that in the area studied an additional variation exists which is related to the Andean gene pool. Different scenarios of the origin of this variation are discussed in the article.

scholarly journals Analysis of Morphological and Molecular Genetic Diversity of Salicornia Iranica Akhani Wildlife Populations around Urmia Lake, Iran

2021 ◽  
Author(s):  
Mohammad Aghaei ◽  
Abbas Hassani ◽  
Hossein Nazemiyeh ◽  
Babak Abdollahi Mandoulakani ◽  
Mohammad Saadatian
Keyword(s):  
Genetic Diversity ◽  
Cluster Analysis ◽  
Morphological Traits ◽  
Molecular Genetic ◽  
Morphological Diversity ◽  
Molecular Data ◽  
Issr Markers ◽  
Shannon Index ◽  
Urmia Lake ◽  
Molecular Genetic Diversity

Abstract Salicornia is a halophyte plant capable of being irrigated with seawater, which can be used as an alternative food. Given this, it is necessary to study the potentials of this plant's morphological diversity in the natural environment. In this study, 33 wild populations of Salicornia were collected from different geographical areas around Urmia Lake during the flowering stage, and some morphological traits and 25 ISSR loci of the plant were measured. Based on morphological traits and the cluster analysis, Salicornia populations were divided into four groups. Overall, the high percentage of polymorphic gene loci (65.69%), the average number of effective alleles per gene locus (1.63), and the Shannon data index (0.540) indicate that ISSR markers can be used in Identify genetic diversity to be used. Molecular data cluster analysis divided the studied populations into two main groups, which included 12.12% and 87.88% of the populations, respectively. Based on the effective analysis of the population's genetic structure and the precise classification of individuals into suitable sub-populations, the value of K = 2 was calculated. The research findings indicated that markers UBC823, B, A7, and K, and with the Shannon index, effective allele, and large heterozygosity values are markers with the highest effectiveness compared to other markers utilized, and they are used better than other compounds in genetic distance. The findings of this study will aid in parental selection studies for breeding programs of salicornia in future.

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