RAPD and ISSR amplification
Genetic diversity and degree of genetic relationship of 23 landraces collected from 21 different locations in the EasternAnatolia region of Turkey and one registered variety were determined using RAPD and ISSR markers. With the 5 RAPD markers used in the study, a total of 29 bands ranging between 500-1500 bp in size were obtained and 20 of them were found to be polymorphic. All of the 8 bands obtained using RAPD-3 primer, which yielded the highest number of bands, were polymorphic (100%) whereas only one of the three bands obtained using RAPD-1 primer, which yielded the lowest number of bands, was polymorphic (33.3%). Thus, the percentage of polymorphism ranged from 33.3% to 100%.
Nosrati et al., (2012) reported the percentage of polymorphism with RAPD markers as 66.67%-84.62%.
Hejrankesh et al., (2014) reported a percentage of polymorphism between 75.5%-83.89% with RAPD primers among 10 different sainfoin landraces. Similar to other studies, RAPD primers had a high percentage of polymorphism. A total of 20 bands ranging between 450-1350 bp in size were observed with ISSR primers and 15 of them were found to be polymorphic. Of the bands obtained using ISSR-3 primer, which gave the highest number of bands, 7 were polymorphic (87.5%), whereas only 1 of the bands obtained using ISSR-1 primer, which gave the lowest number of bands, was polymorphic (33.3%) (Table 3). Thus, the percentage of polymorphism was found to be between 33.3%-83.3%. According to the similarity matrix, there is a low correlation among RAPD and ISSR markers (r=0.063).
Relationship degree and genetic diversity
According to the Jaccard similarity coefficient, using RAPD markers, the closest populations were found to be Bozyiðit and Hizan varieties with a similarity coefficient of 0.95 and the most distant populations were found to be Atalan and Lütfibey varieties with a similarity coefficient of 0.25. According to the results obtained with ISSR markers, the highest similarity was between Özalp and Barýþ, Özalp and Muradiye, Barýþ and Muradiye and Dinlence and Yemişlik varieties, all with a similarity coefficient of 1.00. However, the least similarity was between Yukariyaniktas and Erciþ/Merkez varieties, with a coefficient of 0.50. According to the results obtained using the combination of RAPD and ISSR primers, Bozyiðit and Hizan were the closest populations with a similarity coefficient of 0.91, while the most distant were found Atalan and Alacayar and Atalan and Dolutaş, with a similarity coefficient of 0.45.
Rasouli et al., (2013) reported that, with RAPD markers, the Nei’s genetic similarity coefficient was between 0.08-0.43 among the landraces. Highly similar populations, which were reported by other researchers, were identified in this study as well.
Genetic diversity among populations was calculated according to Nei’s genetic diversity index. According to the findings, it was determined that Nei’s genetic diversity index was 0.3365, 0.2656 and 0.3018 when RAPD, ISSR and RAPD+ISSR markers were used, respectively.
Avcý et al., (2014) reported that the Nei’s genetic diversity index among the different species of O
nobrychiswas between 0.2397-0.2916.
Nosrati et al., (2012) reported that the Nei’s genetic diversity index of
Onobrychis viciifolia species was between 0.2466-0.3186. In their study using RAPD markers,
Hejrankesh et al., (2014), found that Nei’s genetic diversity was between 0.300-0.343 for 10 local varieties of Iran. In a study on 5 populations from Iran, it was reported that Nei’s genetic diversity index was between 0.118 and 0.179 with ISSR markers and was between 0.3640-0.44618 with RAPD markers
(Nosrati et al., 2012; Nosrati et al., 2016). Özkan and Bilgen (2018) reported that Nei’s genetic diversity index obtained using 10 SSR markers was 0.210 for 5 different sainfoin populations.
Shen et al., (2019) reported that genetic diversity among sainfoin is high. The findings obtained from the study were in concordance with the findings of other researchers and it was determined that sainfoin has high genetic diversity.
Özkan and Bilgen (2018) found that the intrapopulation genetic diversity was high, interpopulation genetic diversity was very low in sainfoin populations. These differences were attributed to the number of populations used by the researchers, the collection of these populations from different regions, as well as the use of different markers.
Cluster analysis
In the dendrogram obtained with RAPD markers, the Atalan variety had a separate branching, Yemişlik and Sirimli were clustered under one group and the other varieties were clustered under two groups (Fig 1). In the dendrogram obtained with ISSR markers, the Yuva population had a separate branching, Sirimli and Yukarikaymaz populations were clustered under one group and the other varieties were clustered under two groups (Fig 2). On the other hand, in the dendrogram obtained with the combination of RAPD and ISSR primers, Yukarikaymaz and Lütfibey varieties were clustered under one group, the other varieties were clustered under three groups, whereas Atalan and Sirimli varieties had their separate branchings (Fig 3). In their study using SSR primers with 32 populations,
Kempf et al., (2016) reported that the sainfoin populations were clustered under two main groups. Cluster analysis results in
Hejrankesh et al., (2014) showed that 10 different sainfoin varieties had 3 branchings and in
Özkan and Bilgen (2019) showed that 5 different populations had three branching.