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Evaluation of Genetic Diversity in Rice Collections Using SSR Markers
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/297907
Rice(Oryza sativa L.) feeds more than 50% of the world’s population and is one of the most important crops in the world. To evaluate the variation between different rice classfications, genetic diversity amoung a diverse set of rice collection including 59 breedlines, 23 landraces, 18 weedy rices and 35 introductions were analysed using 134 SSR markers located on the 12 chromosomes. In total, 1269 alleles were identified with an average of 9.47 per locus. Of the 1269 alleles, 460 (36.2%) were common, with a frequency of 0.05–0.5; 741 (58.4%) were rare (frequency < 0.05) and 68 (5.4%) were abundant (frequency > 0.5). A relatively high Polymophism information content (PIC) value was detected in landraces with smaller number of accessions than that of breedlines. Model-based structure analysis revealed the presence of six subpopulations, which was essentially consistent with the clustering based on genetic distance. One hundred and eight accessions (80.0%) showed a clear relation to each cluster based on their inferred ancestry value (>70%), while the remaining 27 accessions (15.4%) of which nine from landraces and fifteen from introductions were categorized as admixtures. Landrace and introductions distributed to almost all the six subpopulations whereas most of breedlines distributed to two distinct subpopulations. In conculusion, landraces in the present study showed critical importance in preservation of genetic diversity and rice breeding programs.
