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Analysis of population structure and genetic diversity of Iranian Wild Salicornia (Salicornia iranica Akhani) population

Abstract

Background

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 55 morphological traits and 25 ISSR loci of the plant were analyzed. Based on morphological and molecular traits and the cluster analysis, Salicornia populations were divided into four and two groups, respectively.

Results

Overall, the high percentage of polymorphic loci (65.69%), the average number of effective alleles per locus (1.63), and the Shannon data index (0.540) indicate that ISSR markers was used to identify genetic diversity. 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.

Conclusions

The research findings indicated that the populations of Salicornia have a considerable diversity in morphological traits. Furthermore, markers UBC823, B, A7, and K, as well as markers with the Shannon index, effective allele, and large heterozygosis values, are the most effective markers in comparison with other markers used in this study. The findings of this study will aid in parental selection studies for breeding programs of Salicornia in future.

Background

Genetic diversity in crops and orchards is an issue long considered by plant breeders searching for new sources of germplasm to perform gene transfer, phylogenetic testing, and marker selection, among other things [18].

Given the role of genetic diversity in advancing breeding programs and the importance of the local population, it is necessary to study the local population’s genetic diversity [31]. A variety of natural genetic resources in an area can provide beneficial genes for plant breeding. These genes have been formed and stored mainly in native plants for centuries [25]. Many of these native species have been being introduced as new plants due to their medicinal and industrial properties [11]. It is necessary to study genetic diversity among different species using morphological features to find desirable traits for further production [26]. Morphological traits obtained from visible mutations in morphology include a wide range of genes that control morphological characteristics based on the phenotypes and serve as the first markers. They used time immemorial, that is, the location of a gene chromosome determined [24]. The most treasured resources in any country include genetic resources. Plant stocks are used by breeders as a resource for genetic material for generating new varieties. For utilizing genetic resources at the highest efficiency, the stored genetic material should be known. Samples can be evaluated in accordance with the purpose of germplasm usage, including pathological, agronomic, morphological, biochemical, molecular, and histological dimensions. With the evaluation of germplasm, information about the weaknesses and strengths of the genotypes and populations and their potentials can be obtained, and genetic basis of each trait can be determined by these evaluations. Investigating genetic diversity in plants is significant from various dimensions. Generally, when genetic diversity is determined, it is beneficial for researchers for managing collections, conservation, maintenance, and specification of plants, as well as usage of plant collections [27]. The use of molecular markers in scientific research has opened up new possibilities for identifying and manipulating particular genes. Molecular markers have become increasingly important in evaluating species diversity and evolutionary relationships [15]. For researchers, the genetic analysis of plants is a foundation for characterizing natural plant genetic resource, detecting genetic diversity or genetic homogeneity, and selecting plants with specific traits such as the synthesis of desired chemicals and stress tolerance mechanisms [8]. Salicornia consists of approximately 15 genus and 68 species [29]. However, it is challenging to classify this plant species due to self-pollination and diversity in local populations.

Besides the loss of leaves and morphological identification indices and the small amount of dry matter compared to wet tissue, the accurate identification of species is difficult [3]. Salicornia iranica Akhani, an endemic species of Salicornia in Iran, grows in central Iran and is a diploid genus of Salicornia [1]. The habitats of this plant in Iran are Fars, Semnan, Gorgan, Bushehr, Hormozgan, Yazd, Khorasan, Khuzestan, Markazi, West and East Azerbaijan, Isfahan, Qom, and Tehran provinces [22]. According to studies, species collected from seven regions surrounding Urmia Lake have been identified as Salicornia iranica [22].

The Salicornia is important as a medicinal plant, and given the fact that there are not adequate and comprehensive studies in different fields of production. The current survey was conducted in order to (1) estimate the morphological and molecular variation among 33 wild Salicornia populations, (2) search for genetic structure of Salicornia populations and identify the most effective ISSR markers, and (3) identify the relationships between morphological characteristics and ISSR markers to partition the genetic variation within and among populations, and provide basic information for conservation and breeding programs. In this study, 33 populations of Salicornia grown around Urmia Lake were collected, and to evaluate the morphological and genetically diversity between different populations, 55 different morphological traits and 25 ISSR markers were studied; also, for future genetic modification and parent plant selection, the results can be made available to the breeders.

Methods

In this study, 33 wild populations of Salicornia in full bloom and plant seeds were collected from different geographical areas in the lake’s vicinity (Table 1, Fig. 1). At the time of data collection, features such as the geographic area’s location and characteristics (altitude and latitude) were recorded. Some populations were geographically less than a few hundred meters apart, which were considered separately, based on field observations.

Table 1 Geographic characteristics of sampling regions of different Salicornia populations around Lake Urmia
Fig. 1
figure 1

Sampling regions of different Salicornia populations around Urmia Lake. Map constructed with Google maps

Fifty-five morphological traits were evaluated. Fifteen specimens were sampled per population, and for each plant, all 55 traits were calculated (Table 2). The morphological traits were measured in the Plant Physiology Laboratory, Horticulture Department, Faculty of Agriculture, Urmia University, and Herbarium, Faculty of Pharmacy, Tabriz University. The properties were measured using a ruler, digital caliper, scrubber, and optical microscope [12, 14].

Table 2 Morphological traits studied in Salicornia populations

Studying genetic diversity

Molecular evaluation

CTAB approach [6] was used for extraction of individual genomic DNA. Spectrophotometry and 1% agarose gel electrophoresis were performed for evaluating the quantity and quality of the extracted DNA. Using 25 ISSR primers, genotypes were recorded in the subjects. Lodhi et al. [19] optimized PCR reactions and their temperature cycle. PCR was run in 15-μl reaction mixture, which consists of master mix 2× of 5 μl, primer 10pM of 1 μl, template DNA 50 ng/μl concentration of 2 μl, and sterile water of 7 μl. PCR amplification profile with 95 °C for 4 min of initial denaturation, followed by 30 cycles of 94 °C for 30 s, 41–58 °C for 1 min and 72 °C for 1 min, and followed by a final extension for 10 min at 72 °C. PCR amplicons were resolved on 0.8% agarose gel electrophoresis. Besides, using the GeneRuler’O Fermentas size indicator, the size of the band was determined.

The combination of markers was used for obtaining population structure according to the data by the use of STRUCTURE software 2.3.4 (30) with 50,000 MCMC repetitions and 50,000 in-Burn time in Admixture mode in varying values of K in a range of 1–20 (5 repetitions per k). This software was also used for estimating the membership share matrix (Q). With this matrix, it is shown that each member to what extent fits to the clusters. Using the same software, the average stabilization index (FST) was calculated for potential subgroups. The approach proposed by Evanno et al. [9] was used for determining the actual number of subpopulations. The basis of this approach is on ΔK statistic breaking a function’s slope when there is the maximum probability for a hypothetical number.

Statistical analysis of data

The ANOVA and variation within-group were expressed as coefficient of variation for quantitative descriptors calculated for each group and the whole collection. Principal components analysis (PCA) was performed using XLSTAT 2018.1 statistical software. The first and second principal component axes scores were plotted to aid visualization of origin group differences and detect morphological variation in the collection.

Analysis of data

Population structure was studied using bands from all marker matrices. Using different algorithms, such as UPGMA, single linkage, and complete linkage, cluster analysis was performed. These algorithms were employed as zero (absence) and one (presence) scoring. The clusters were drawn in the present work using Mega software. Also other data were analyzed using the following software: NTSYSpc version 2.0.1.5, SAS 9.2 (ANOVA analysis), SPSS (means), Mega (Molecular analysis), and PopGene (Molecular analysis).

Results

The variation and the mean traits were examined for different populations. Among the studied populations of Salicornia, the non-fertile parts on the longest secondary branch (V29) (84.75%), the fertile parts on the longest secondary branch (V28) (81.49%), and the flowering plants in the first lateral branch (V34) (66.13%) had the highest diversity (Table 3). According to the results, the highest and lowest number of primary lateral branches (V9) was observed in P27, 43, and P22, 13.4, respectively. Complete information about other variables is given in Table 3.

Table 3 Descriptive statistics for the estimated morphological traits studied in Salicornia populations

The first five of the 32 principal components (PCs) obtained have eigenvalues greater than 2. Together, they accounted for about 67.28% of the total variance of Salicornia traits (Fig. 2, Table 4). The first two PCs account for 42.32% of the total variability (25.76% and 16.56%, respectively) (Tables 4 and 5). PC1 represent ration of V7, V8, V11, V14, V16, V19, V25, V26, V31, V32, V37, V38, V39, V40, V41, V42, V44, V45, V46, V53, and V55. PC2 describe the ration of V1, V10, V13, V23, V24, V27, V30, and V43. Figure 2 and Table 4 show that traits lie around PC1 and PC2 center. The large variability of the traits allows observation such as V10, V31, V39, V41, and V45, where the amount of length of longest 1st primary branch, length of the terminal spike, height of central floret of 3rd fertile segment, height of side floret of 3rd fertile segment, and distance between florets on 2nd fertile segment.

Fig. 2
figure 2

Plot distribution of 33 Salicornia populations and studied traits depending on principal component axes PC1 and PC2. The first two components had a variation of (1) 25.76% and (2) 16.56%

Table 4 Principal components for studied morphological traits in Salicornia populations
Table 5 Eigenvalue, proportion, and cumulative variation of analyzed components

According to the morphological traits results of cluster analyses by the Ward method, Salicornia populations were assigned to four groups (Fig. 3). The first group contained 8.18% of populations (P16, P18, P24, P31, P20, and P22). In this group, populations with a short height, long spike, greater weight of 1000 seed, low number of stomata, and the width across the apex on the third fertile segment were more abundant than other populations. The morphotype and inflorescences of this group were distinct from other groups. The second group covered 15.15% of the whole population (P3, P11, P23, P2, and P33), comprising populations that were within the average range of sizes for diverse traits. The third group hosted 15.15% of the population (P4, P6, P1, P8, and P10), and the fourth group included 51.51% of the population (P9, P30, P25, P27, P21, P26, P15, P12, P28, P7, P14, P17, P5, P19, P29, P13, and p32). These populations had a great height, more internodes, more lateral branches, more stomata, a great weight of 1000 seeds, and the width of the third fertile segment on the terminal spike. The accurate number of groups was identified using the detection function.

Fig. 3
figure 3

Hierarchical cluster analysis (HCA) of different Salicornia populations based on 55 main morphologic traits

Genetic diversity of Salicornia populations

We evaluated genetic diversity in 33 Salicornia populations using 42 ISSR primers. Twenty-three primers out of 42 primers under study generated a polymorphic band design at the suitable resolution, which were employed for the subsequent analysis phases (Table 6). In total, 204 alleles with an average 8.87 allele per marker were detected, 134 of them were polymorphic (65.69%). The ratio of markers to primer was 1 to 14, averagely 5.82 (Table 6, Fig. 4).

Table 6 Markers name, annealing temperature (°C), total band, polymorphic band, and percent of polymorphic band
Fig. 4
figure 4

Fingerprint images of Salicornia populations with primer UBC860

The number of effective (Ne) alleles ranged from 1.25 for UBC849 and 1.92 for in PB with an average 1.63 per locus. Maximum value of this statistic shows that alleles have identical frequency in this location, and this statistic’s minimum shows the rarity of other alleles and one allele’s high frequency in samples.

In investigating allelic diversity, the highest observed heterozygosity was found by B marker with 0.477; however, the lowest observed heterozygosity was noticed by UBC849 marker with 0.199. Besides, the highest expected heterozygosity was observed at approximately 0.484 by B marker, and the lowest expected heterozygosity was observed at approximately 0.203 in the UBC849 marker. Examining Shannon index (I) values showed that the highest value for this index was in marker B with a 0.670 and the lowest value was in UBC849 marker as 0.351 (Table 7).

Table 7 Number of effective alleles (Ne), Shannon index (I), expected heterozygosity (He), and observed heterozygosity (Ho)

The Jaccard similarity coefficient and UPGMA algorithm were used for dividing different populations into two separate groups. The first group contained 12.12% and the second group included 87.88% of the masses. Two subgroups were made in the first group, which the first one included P24, P22, P26, and P1. The second group contains the residual 29 populations (P13, P20, P18, P30, P32, P29, P19, P8, P15, P17, P5, P27, P12, P33, P28, P31, P16, P21, P23, P14, P4, P3, P2, P7, P25, P6, P10, P11, P9), which was classified into two subgroups. The first one is composed of just the P13 population. Also, this population was approximately different from other ones (Fig. 5).

Fig. 5
figure 5

Dendrogram showing relationships among 33 population of Salicornia. Group I represents the four populations while group II represents other 29 populations based on ISSR marker (algorithm UPGM)

Structure 2.3.1 software was used for analyzing genetic population structure and precise classifying individuals into proper subpopulations. As shown by a two-way diagram of optimal determination of K with ISSR indicator, the ISSR primer shows the best K as 2, i.e., two subpopulations (K = 2) in the cultivars under study. The group was specified (Tables 8 and 9).

Table 8 Mean Stabilization Index (FST) of each cluster based on cluster analysis based on Bayesian model at K = 2
Table 9 Population membership matrix in each cluster based on Structure 2.3.1 software calculations at K = 2

The stabilization index (FST) is a common and appropriate measure for genetic differentiation among groups and populations. When the FST is higher, a better allele differentiation is obtained, with a higher allele stabilization rate. Potential subgroups in K = 2 show the difference among the populations under study in two potential groups. Besides, the individuals’ matrix of the share in these groups (Tables 4 and 5) indicated belonging populations with high coefficients to one group. Bar plot results demonstrated inclusion of 26 Salicornia populations in the first group (red) and 5 populations in the second group (green), with 2 populations had a complex structure (Fig. 6).

Fig. 6
figure 6

Population genetic structure of 33 populations of Salicornia. A Graph showing the best value of K=2. B Bar plot of structure at K=2 indicating less admixture between analyzed populations. Each color represents a subset or cluster. The vertical axis shows the coefficient of belonging of each person to each cluster

Discussion

The results showed that there was a significant difference between the studied populations in terms of traits in the question. Based on the mean of traits measured in the population, traits with a high percentage of variance had a wide range of trait quantities and offered a more extensive choice for traits. This difference is due to the impact of both genetic and environmental factors. Studies have shown that fluctuations in soil and water salinity lead to physiological and phenotypic changes in the plant. Also, high plant density in a population restricts the number of branches and glaciers formed in the plant [13]. Self-pollination in plants, especially in diploid species, due to the flower’s unique structure, leads to the formation of various local populations in Salicornia [5]. The phenotypic variation coefficient between traits results in morphologically different plants manifests distinct genetic variations in different regions [28]. Together with the weight of 1000 seeds, these traits undermine the plants’ ability to produce satisfying seeds. With an increase in the number of internodes and lateral branches, the weight of 1000 seeds drops. Most of the plant energy comes spent on vegetative growth. Studies have focused on Salicornia’s two species in Iran (S. Biglovi and Salicornia persica). In S. biglawi species, raising the salinity of irrigation water to 45 dS/m reduces the height and dry weight of the plant. In Persica species, increasing the irrigation water salinity had no effect on plant height but significantly decreased the dry weight [28].

The cluster analysis results showed that (Fig. 3) the clustering of populations is incompatible with geographical distribution. It may be due to sources of seed diversity caused by migration to different areas. Therefore, it may not be limited to different geographical regions in selecting parents for breeding projects, but it should be consistent with each population’s specific capacities. By studying Salicornia pusilla, researchers have found that the plant seeds remain attached to the inflorescence after ripening, and the spikes are trapped by a separating layer of the plant isolated in the water that may keep moving with the flow of water up to 3 months. They may even germinate but do not grow until the seeds are deposited in sediments [4]. This feature may explain the common seed origin in the studied populations. Using 22 growth parameters, the researchers evaluated 11 S. bigelovii populations in the field and divided the cluster analysis of studied populations into four groups [20]. Contrary to our study, the results of research on the genetic diversity of six Salicornia ramosissima populations in central Germany showed that it is consistent with geographical distribution [17]. A review of the genetic diversity of the two species of saline Salsola manifested a significant difference in this plant and the environmental conditions of the plant, suggesting that disparity in salinity, nutrition, pH, and soil moisture changes the vegetative type of plants [30]. The results of analyzing the main components confirmed the clustering obtained from the cluster decomposition. The analysis of main components sheds light on the difference between individuals and allowing the identification of groups and the relationship between individuals and variables [21]. Based on the results of this analysis and multivariate analysis, four Salicornia populations were divided into three separate groups: the first component (46.11%), the second component (41.35%), and the overall component (87.46%) of the entire diversity. The study of the morphological diversity patterns of 52 Salicornia populations in 31 regions of Northern Europe using 28 morphological traits demonstrated diversity in the studied populations. The main components’ analysis revealed the first five components accounted for 79.8% of the total diversity. In the first component, characteristic spikes included the length of fertile segment and length of the spike (explaining 40% of the diversity, and in the second component, they included the size of the plant and the branches (explaining18.1% of the diversity) [10]. The findings are aligned with our results. Principal component analysis revealed that V7, V8, V11, V14, V16, V19, V25, V26, V31, V32, V37, V38, V39, V40, V41, V42, V44, V45, V46, V53, and V55 contributed mostly to diversity.

Though the association between regional diversity was not that evident, a close look at the scatter plot revealed some regional adaptation level was observed. Such regional variability could be due to geographic isolation and microclimatic differences between regions. Factors such as plant population isolation, adaptation to the environment due to declining lake water levels, and strong self-pollination within the plant population may contribute to Salicornia’s population diversity. The degree of morphological differentials is significantly noticeable in different populations from four groups.

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.

As stated by Dirlewanger et al. [7], there is a relationship between the alleles number in each gene locus and the number of used markers and the samples’ number. According to the findings of research on the genetic diversity of six populations of Salicornia herbacea in South Korea, where 6 ISSR markers were used, 39 polymorphic bands were obtained out of 49 bands, with an average of the effective allele for each gene locus as 1.22. The mean genetic index was 0.249 and the mean Shannon index was 0.382. These researchers mentioned that for achieving high diversity in populations Salicornia, a wider research scope is required to be chosen [16]. Using ISSR markers to identify genotypic differences among the 23 genotypes of finger millet revealed a high degree of polymorphism supported by substantial differences in all marker parameters [33].

These populations were separately gathered because of varying morphological types compared to other populations. Also, this difference is shown in the results. The second subgroup included P26 and P1 populations, with different appearances compared to other populations. They had a taller plant than average, particularly the taller plant was observed in P26 population among all populations. Moreover, long glazes were observed in these two populations. Additionally, it shows all botanical properties of S. Iranica [1].

In earlier Iranian research works on Salicornia, 36 samples of Salicornia were collected by Heydarian [10] from different saline areas. He specified this plant’s genetic diversity by the use of 17 RAPD markers, Jaccard similarity coefficient, and UPGMA approach. The subjects were categorized into 7 classes. Moreover, 18 Salicornia populations were evaluated by Mohammadi [23], which were collected from different regions in Iran. He used AFLP markers and categorized the individuals into 4 groups by the use of UPGMA method and Jaccard similarity coefficient. As shown by the research in this work, the researcher collected species from 7 regions near Lake Urmia and S. iranica are presented, all in a group. In this research, S. iranica species were separated from S. persica species using the AFLP marker, and they were placed in a subgroup. Additionally, the populations gathered from each area were put in a different subgroup. The genetic diversity in 11 Salicornia brachiata populations was evaluated in India using 15 ISSR and 15 RAPD primers [2]. The investigated populations showed high diversity. It was also observed in both markers of the populations under study. They were grouped into 3 groups.

The resulting bar plot showed that when the membership percentage to a cluster for a genotype is higher than or equal to 0.7, the genotype is allocated to that cluster, while if the percentage is below it, it is considered as a mixed genotype (hybrid) [32]. Generally, when the average effective allele numbers per gene locus (1.63), the polymorphic gene loci percentage (65.69%), and the Shannon data index (0.540) are high, it is indicated that we can use ISSR markers for identifying genetic diversity.

Conclusions

This study showed that Salicornia populations growing around Urmia Lake had considerable diversity in morphological and ISSR characteristics. The incompatibility of population clustering with their geographical distribution may be due to different populations’ exact seed origins. The populations under the genetic study were divided into two major groups based on marker data, including 12.12% and 87.88%. The K value was obtained as two according to the practical analysis of the population’s genetic structure and the accurate individuals’ classification to suitable sub-populations. The populations under study were classified into two groups because Salicornia is a self-pollinated plant. Differences in morphological and genetic grouping may be due to the environment’s effect on morphological traits, while in genetic traits, the difference between the populations may be due to the populations’ isolation due to the lowering of the lake water, and the plant was directed towards self-breeding. Combining morphological and ISSR data may be more effective for defining genetic variation and genetic diversity within the Salicornia population.

Availability of data and materials

All data is provided in full in the results section of this paper.

Expression all morphological and molecular data is openly available from Dryad at https://doi.org/10.5061/dryad.83bk3j9r

Abbreviations

ISSR:

Inter Simple Sequence Repeat

CTAB:

Cetyltrimethylammonium bromide

MCMC:

Markov Chain Monte Carlo

UPGMA:

Unweight Pair Group Method with Arithmetic Mean

PCA:

Principal component analysis

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Acknowledgements

The authors sincerely thank Urmia Lake Studies Research Institute for providing part of this research’s necessary funds (Grant No. 608/53)

Funding

The Urmia Lake Studies Research Institute partly supported this work under Grant No. (608/53)

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MA co-designed the research, analyzed the data, prepared the figures, and wrote the manuscript. AH performed the observations and measurements in the field. HN performed the observations and measurements in the field. BAM co-designed the research and performed the fieldwork. MS analyzed the data, prepared the figures, and wrote the manuscript. The authors read and approved the final manuscript.

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Correspondence to Mohammad Aghaei.

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Aghaei, M., Hassani, A., Nazemiyeh, H. et al. Analysis of population structure and genetic diversity of Iranian Wild Salicornia (Salicornia iranica Akhani) population. J Genet Eng Biotechnol 20, 61 (2022). https://doi.org/10.1186/s43141-022-00337-0

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Keywords

  • Genetic distance
  • Cluster analysis
  • ISSR
  • Morphological traits
  • Salicornia