Determination of Genetic Diversity of Walnut (Juglans regia L.) Genotypes Grown in Khorasan Province Using RAPD, ISSR and SSR Markers

Karimi Shahri, Mahmoud Reza; Rahamouz Haghighi, Samaneh; Sarabandi, Melina; Fahadan, Ahmad

doi:10.22080/jgr.2026.30535.1451

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	Determination of Genetic Diversity of Walnut (Juglans regia L.) Genotypes Grown in Khorasan Province Using RAPD, ISSR and SSR Markers
Journal of Genetic Resources
دوره 12، شماره 1، 2026، صفحه 53-63 اصل مقاله (441.56 K)
نوع مقاله: Research Article
شناسه دیجیتال (DOI): 10.22080/jgr.2026.30535.1451
نویسندگان
Mahmoud Reza Karimi Shahri^* ¹؛ Samaneh Rahamouz Haghighi¹؛ Melina Sarabandi²؛ Ahmad Fahadan³
¹Department of Plant Protection, Khorasan Agricultural and Natural Resources Research and Education Center, AREEO, Mashhad, Iran
²Department of Horticultural Science and Landscape, University of Tehran, Karaj, Iran
³Department of Field and Horticultural Sciences, Khorasan Agricultural and Natural Resources Research and Education Center, AREEO, Mashhad, Iran
تاریخ دریافت: 03 آذر 1404، تاریخ بازنگری: 03 خرداد 1405، تاریخ پذیرش: 06 دی 1404
چکیده
Walnut (Juglans regia L.) is an important nut and timber tree species belonging to the family Juglandaceae. Iran ranks among the leading walnut-producing countries in the world, after the United States and China. Persian walnut is widely cultivated for its high-quality nuts and valuable wood. Due to its predominant seed propagation and outcrossing nature, walnut exhibits considerable genetic diversity, which can be exploited in breeding programs for crop improvement. In the present study, genetic variability, and relationships among 13 promising walnut genotypes were evaluated at the Khorasan Razavi Agricultural and Natural Resources Research Center using three molecular marker systems: RAPD, ISSR, and SSR. Among the 15 RAPD, 10 ISSR, and 15 SSR primers tested, 8 RAPD, 3 ISSR, and 6 SSR primers produced clear, reproducible, and scorable bands with a high level of polymorphism. RAPD, ISSR, and SSR primers generated a total of 93 amplification products, of which 76 were polymorphic. Genetic similarity based on RAPD, ISSR, and SSR markers ranged from 0.431 to 0.754, with a mean value of 0.592. A relatively moderate to high level of genetic diversity was observed between the Z30 and Ronde De Montignac genotypes. SSR analysis revealed 5 to 7 alleles per locus, all of which were polymorphic, while genetic similarity values ranged from 0.123 to 0.571 with an average of 0.347. Cluster analysis grouped all accessions into two major clusters with several subclusters, indicating considerable genetic variation among the studied genotypes. These findings provide useful information for walnut germplasm characterization, conservation, and future breeding programs.
کلیدواژه‌ها
Genetic diversity؛ Juglans regia؛ Molecular markers؛ Polymorphism؛ Walnut

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Determination of Genetic Diversity of Walnut (Juglans regia L.) Genotypes Grown in Khorasan Province Using RAPD, ISSR and SSR Markers