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    The Effect of Grafting on Morphological, Physiological and Molecular Changes Induced by Drought Stress in Cucumber
    (Mdpi, 2023) Coskun, Omer Faruk
    Drought is one of the most important abiotic stress factors affecting crop yields and qualities worldwide. One drought-sensitive plant is the cucumber, which has a high transpiration rate. Grafting is recognized as a promising approach to increasing tolerance to abiotic stresses in cucumber. In this study, it is aimed to determine the rootstock that will prevent negative changes in some growth, physiological and genetic parameters of cucumber under drought stress and to determine the mechanism of the system. In drought stress conditions, leaf number values were found to be 6 on average in non-grafted plants and between 6-13.16 in grafted plants. Average leaf fresh weight values (7.56-9.84 g) obtained from grafted plants were higher than non-grafted plants (5.7 g). Leaf chlorophyll content (SPAD) values were found to be between 24.43 in non-grafted plants and 37.83-55.36 in grafted plants under stress conditions. Malondialdehyde (MDA) concentration values also decreased from 5.66 to 3.23-4.36 in grafted plants. It was determined that the genomic template stability (GTS) rate was 64.1% in the non-grafted treatment group. DNA polymorphisms detected by ISSR (inter simple sequence repeat) can be used as a biomarker system for the detection of genotoxic effects of abiotic stresses, such as drought. These findings suggest that grafting with drought-resistant rootstocks may improve drought tolerance in drought-sensitive cucumber genotypes.
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    The mediating role of organizational silence in the relationship between organizational justice and organizational creativity
    (Emerald Group Publishing Ltd, 2024) Olcer, Ferit; Coskun, Omer Faruk
    Purpose The purpose of this study is to determine the relationships between organizational justice, organizational silence and organizational creativity and to examine the mediating role of organizational silence in the effect of organizational justice on organizational creativity. Design/methodology/approach Research data were collected using a face-to-face survey method applied to employees in the automotive industry in Turkey. The research model and hypotheses were tested by structural equation modeling. Findings Research results indicate that organizational justice positively affects organizational silence, organizational creativity is positively affected by organizational justice and organizational silence positively affects organizational creativity. Besides, according to the results, organizational silence has a partial mediating role in the effect of organizational justice on organizational creativity. Originality/value Although the relationships between organizational justice, organizational silence and organizational creativity were examined in previous studies in the literature, the role of organizational silence in the relationship between organizational justice and organizational creativity was not investigated. Besides, although previous studies examined the mediating role of variables that are thought to have a positive effect on the organization between organizational justice and organizational creativity, they did not study the role of a variable of organizational silence, which is considered negative. For these reasons, this study is predicted to differentiate the perspective in the literature and fills a gap in the literature.
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    The mediator and moderator role of positive organizational behavior in the effect of corporate reputation on organizational commitment
    (Natl Research Univ Higher Sch Economics, 2021) Olcer, Ferit; Coskun, Omer Faruk
    Purpose. This study aims to determine the relationships between corporate reputation, organizational commitment, and positive organizational behavior and to examine the mediator and moderator role of positive organizational behavior in the effect of corporate reputation on organizational commitment. Methodology. Research data were collected using a questionnaire method on 138 employees working in the sales stores affiliated to the regional directorate of an enterprise operating in the telecommunications sector. The data obtained were analyzed by correlation and regression tests, and the models and hypotheses developed within the research scope were tested. Findings. Research results indicate that corporate reputation is an important predictor of both organizational commitment and positive organizational behavior. According to another important result of the study, positive organizational behavior predicts organizational commitment. However, the analysis results on the role of positive organizational behavior in the effect of corporate reputation on organizational commitment show that positive organizational behavior has a partial mediating and moderating role in this relationship. Originality. When the studies conducted in the literature are reviewed, it is seen that many studies investigate the bilateral relations between corporate reputation and organizational commitment, corporate reputation and positive organizational behavior, and positive organizational behavior and organizational commitment. However, no research was found on the role of positive organizational behavior in the effect of corporate reputation on organizational commitment. This study is expected to respond to an unanswered question about the role of positive organizational behavior in the effect of corporate reputation on organizational commitment, fill an important gap in the literature, and contribute to explaining the relationships between corporate reputation, positive organizational behavior, and organizational commitment.
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    Molecular Characterization, Population Structure Analysis, and Association Mapping of Turkish Parsley Genotypes Using iPBS Markers
    (Mdpi, 2023) Coskun, Omer Faruk
    Parsley (Petroselinum crispum Mill.) is a vegetable that has many benefits for human health, and its cultivation is increasing. In order to carry out breeding studies in parsley, genotypes should be characterized in terms of some characteristics. In this study, some phytochemical properties of 18 different parsley genotypes were revealed, and their genetic diversity was determined with the iPBS (Inter Primary Binding Site) marker system. In the study, the polymorphism rate was 31.9%, the mean PIC (Polymorphic Information Content) was 0.17, and the similarity coefficients were between 0.87 and 0.99. The number of subpopulations was determined as two, and 10 markers were detected at expression levels of 19-33% related to phytochemical properties. The results of this study show that there is a phytochemical and genetic variation in parsley. Parsley genotypes with certain phytochemical properties and genetic structures can be used more effectively in breeding programs.
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    Morphological and molecular characterization of garlic (Allium sativum L.) genotypes sampled from Turkey
    (Springer, 2022) Kirac, Hayrettin; Sekerci, Akife Dalda; Coskun, Omer Faruk; Gulsen, Osman
    Garlic is a vegetable widely used both in food and as a pharmaceutical raw material in the world due to its contents. Although morphological differences are observed in garlic, which is obligatory apomictically propagated, clonal propagation causes narrowing variation, a genetic bottleneck. This situation complicates breeding programs aiming improvements in preferred agronomic characteristics. For this reason, determining the morphological and molecular differences between garlic genotypes originating from Turkey is important for breeding studies. In this study, morphological and molecular characteristics of 39 garlic genotypes, which are widely cultivated in Turkey, were determined. Kahramanmaras4 genotype was different from other genotypes in terms of some morphological features (fresh weight, dry weight, and bulb diameter). In the molecular characterization study, 10 Inter-Simple Sequence Repeats (ISSR) primers were used, and it was determined that the genotype TekDis31 of Tunceli region was different from other garlic genotypes. Genetic similarity coefficient was found to be high (0.85-1.0) in genotypes except for TekDis31 garlic genotype. In general, some garlic clones (Maras3 and Kayseri30, Urfa33 and Topakli35, Kastamonu22 and Kastamonu28, Urfa10 and Kastamonu14, Kastamonu29 and Bademci23) were completely similar to each other, while few differences were found among others. In conclusion, this study revealed that the garlic plant, despite its clonal propagation, consisted of some level of morphological and partially molecular variation. Due to its mode of reproduction (vegetative), this variation may largely be due to point or chromosomal mutation. Furthermore, the 10 identified ISSR primers can generate valuable information for genetic diversity for use by garlic breeders.
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    Some seed properties and molecular analysis with inter-primary binding site (iPBS) retrotranposons markers of edible-seeded watermelon genotypes
    (Springer, 2024) Coskun, Omer Faruk; Toprak, Seher; Mavi, Kazim
    Watermelon, one of the most important vegetable species in the world, is grown mostly for its fruit. However, there are also genotypes grown for their seeds in some parts of the world and that have snack potential due to their seed characteristics. This study was carried out to determine the morphological-molecular variation of edible-seeded watermelon genotypes and to identify markers associated with seed characteristics. Morphologically, 11 parameter measurements were made repeatedly. The highest value of the number of seed/fruit was determined in the HMKU-KR-15 genotype, and the highest value of 1000 seed weight was determined in the HMKU-KR-6 genotype. The lowest ease of cracking value and the highest weighted scaling score were detected in the HMKU-KR-20 genotype. In molecular research, a total of 135 bands in 24 genotypes were obtained using the inter-primary binding site (iPBS) marker technique and the polymorphism rate was calculated as 79.70%. Three main clusters emerged in cluster analysis. In structure analysis, it was determined that the genotypes consisted of two subpopulations. Seven markers were identified at levels of 29-46% related to seed characteristics. It has been determined that edible-seeded watermelon genotypes can be genetically distinguished using iPBS techniques. The results of this study can be used in breeding strategies to improve edible-seeded watermelon cultivars.