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Genetic Diversity Assessment of Promising Walnut (Juglans regia L.) Genotypes Using RAPD, ISSR, and iPBS Markers Cover

Genetic Diversity Assessment of Promising Walnut (Juglans regia L.) Genotypes Using RAPD, ISSR, and iPBS Markers

Open Access
|Nov 2025

Figures & Tables

Fig. 1:

The map of Şanlıurfa province illustrates the locations of collection sites. In the bottom right corner, a map of Türkiye shows the location of Şanlıurfa province.
The map of Şanlıurfa province illustrates the locations of collection sites. In the bottom right corner, a map of Türkiye shows the location of Şanlıurfa province.

Fig. 2:

Dendrogram of 20 promising walnut genotypes using UPGMA method based on RAPD, ISSR, iPBS, and combined data.
Dendrogram of 20 promising walnut genotypes using UPGMA method based on RAPD, ISSR, iPBS, and combined data.

Fig. 3:

The principal coordinates of the analyzed twenty promising walnut genotypes depend on the applied molecular markers. Each point on the graph represents a specific genotype, with the positioning revealing the similarity or divergence among them based on the molecular data applied in the analysis.
The principal coordinates of the analyzed twenty promising walnut genotypes depend on the applied molecular markers. Each point on the graph represents a specific genotype, with the positioning revealing the similarity or divergence among them based on the molecular data applied in the analysis.

Fig. 4:

The genetic structure of walnut genotype populations carried out using STRUCTURE HARVESTER. The proportions of gene contributions (a) and Delta K values according to the Evanno test (b). Different colors represent the genetic participation ratio for each relevant group.
The genetic structure of walnut genotype populations carried out using STRUCTURE HARVESTER. The proportions of gene contributions (a) and Delta K values according to the Evanno test (b). Different colors represent the genetic participation ratio for each relevant group.

The information of RAPR, ISSR, and iPBS markers used to evaluate walnut genotypes

Primer IDPrimer sequences (5′–3′)TmGC (%)TBPBPPBPICRP
RAPDOPF10GGAAGCTTGG36.060.010770.000.243.50
OPA18AGGTGACCGT36.060.00141071.430.306.70
OPAZ04CCAGCCTCAG36.070.007685.710.404.60

Total 3123---
Mean 10.337.7775.530.314.93

ISSRHR08GAGAGAGAGAGAGAGAYC52.052.89666.670.223.00
SDo7 (CT)8RGCTCTCTCTCTCTCTCTRG54.052.8131184.620.274.80

Total 2217---
Mean 11.008.5075.650.253.90

iPBS2376TAGATGGCACCA43.150.0171376.470.225.30
2238ACCTAGCTCATGATGCCA55.550.0181266.670.215.30
2394GAGCCTAGGCCA48.566.7141071.430.214.00
2415CATCGTAGGTGGGCGCCA62.566.7161275.000.224.60

Total 6547---
Mean 16.2511.7572.390.224.80

Diversity parameters obtained by different molecular markers utilized on walnuts_

NNaNeIHeuHe
iPBSMean20.0001.7231.2560.2750.1700.174
Std. Err.0.0000.0560.0340.0290.0200.020
ISSRMean20.0001.7731.4600.3920.2630.270
Std. Err.0.0000.0910.0850.0590.0430.044
RAPDMean20.0001.7421.4400.3910.2610.268
Std. Err.0.0000.0800.0640.0480.0340.035
CombinedMean20.0001.7371.3420.3270.2110.217
Std. Err.0.0000.0410.0310.0230.0170.017

Mantel test correlation coefficient between studied molecular markers based on RAPD, ISSR, iPBS, and combined data

RAPDISSRiPBS
ISSR0.277
iPBS0.0060.068
Combined0.5410.4690.786

Geographic coordinates and altitudes of promising walnut genotypes_

Genotype NoCoordinateAltitude
837°20′41″N 38°58′10″E631 m
1537°05′05″N 39°02′57″E420 m
1837°02′17″N 39°37′17″E518 m
2637°02′13″N 39°37′21″E526 m
2737°06′05″N 38°48′13″E515 m
2937°20′46″N 38°58′16″E656 m
3037°17′19″N 39°00′18″E584 m
3137°02′17″N 39°37′24″E527 m
3637°18′31″N 38°50′09″E742 m
4537°08′34″N 38°32′45″E796 m
4837°00′15″N 39°00′26″E390 m
6137°18′26″N 38°36′03″E746 m
7337°18′31″N 38°50′11″E741 m
7537°16′20″N 38°41′14″E714 m
7637°18′28″N 38°36′01″E748 m
8937°18′29″N 38°50′13″E738 m
9037°13′44″N 38°42′55″E754 m
9436°48′22″N 39°29′00″E470 m
10337°02′19″N 39°37′24″E511 m
11837°16′24″N 38°41′15″E710 m
DOI: https://doi.org/10.2478/mittklbg-2025-0008 | Journal eISSN: 3061-063X | Journal ISSN: 3061-0621
Language: English
Page range: 115 - 130
Submitted on: May 9, 2025
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Published on: Nov 20, 2025
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2025 İbrahim Başak, Ferhad Muradoğlu, Göksel Özer, Emrah Güler, published by High School and Federal Office of Viticulture and Pomology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.