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    Comparative Analysis of Alfalfa Mutants in Response to Drought Stress Applied After First Cutting
    (Springer, 2024) Cetin, Selcuk; Tiryaki, Iskender; Sari, Ugur; Acar, Okan
    The purpose of this study was to determine the agro-morphological, physiological, and transcriptional characteristics of ethyl methane sulfonate (EMS)-mutagenized M3 alfalfa (Medicago sativa L.) mutants grown for 24 days under water deficit conditions following the first cutting at the blooming bud stage. Drought stress generally reduced all agro-morphological parameters measured. Cutting stress significantly reduced total chlorophyll contents of all genotypes, with the exception of mutant X20. Significant changes occurred in the levels of ascorbate peroxidase (APX), lipid peroxidation (TBARS), glutathione reductase (GR), superoxide dismutase (SOD) and crude protein levels. Drought stress considerably elevated GR levels in irrigated control (C1) and unirrigated control (C2) plants. In contrast to the other genotypes studied, mutant X20's crude protein level increased significantly after the first cutting under 24 days of water deficit conditions, compared to the level found before cutting. The expression profiles of Medicago truncatula Response to Desiccation 2 (MtRD2) and Medicago sativa proline dehydrogenase (MsProDH) genes differed based on the plant genotype and duration of drought stress. Drought stress increased MsProDH gene expression in X20, X50, and C2 plants by 4.57, 14.8, and 20.65 times, respectively. The findings of the expression study indicated that the MtRD2 gene may play a key role in stress reduction rather than drought stress per se. The results of this study revealed that cutting and drought are two independent stress variables that should be evaluated separately when evaluating genotype response to both irrigated and unirrigated growing environments in alfalfa.
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    Öğe
    Improved drought tolerance of EMS mutagenized Alfalfa (Medicago sativa L.) mutants by in vitro screening at germination stage
    (Nature Portfolio, 2022) Tiryaki, Iskender; Sari, Ugur; Cetin, Selcuk; Acar, Okan
    The objectives of this study were to determine drought tolerant novel mutant of alfalfa (Medicago sativa L.) genotypes by screening EMS mutagenized 340675 M-3 seeds at germination stages in the presence of osmotic stress of 35% PEG(6000). Root growth assay provided several drought tolerant candidate mutants. Of those, 4 mutants were further evaluated at water deficit conditions applied for 24 days after the first cutting at flowering bud stage. The results revealed that mutants determined as drought tolerant at germination stage were also tolerant to water deficit conditions. Protein content and superoxide dismutase values were found to be higher in all mutants than controls. Ascorbate peroxides, glutton reductase and lipid peroxidase values varied based on the mutant genotype and duration of drought stress. Drought stress significantly changed transcriptional levels of MtP5CS, MtDehyd, MseIF-2, MtRD2 and MsNAC genes. These results indicated that in vitro screening of alfalfa mutant seeds for osmatic tolerance at germination and early seedling growth stages was successfully able to determine the drought tolerant alfalfa mutants which were also tolerant to water deficit conditions after the first cutting at flowering bud stage.
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    Unusual autopsy finding: Simon's bleeding
    (Slovene Medical Soc, 2013) Eren, Bulent; Turkmen, Nursel; Akgoz, Semra; Cetin, Selcuk; Eren, Filiz; Gundogmus, Umit Naci
    Objective: To determine whether or not hanging had taken place before or after the death of the victim is quite important in the identification of criminal cases pretended to be suicidal attempts. Material and Methods: Evidence for Simon's bleeding was searched in cases included in the study group after retracting soft tissue and organs away from the field of interest for full exposure of the region of lumbar spinal veretebrae without macroscopic grading of the severity of bleeding, and determining the lumbar level of bleeding. The cases autopsied in Bursa Morgue Department between 2009 and 2011 were retrospectively investigated and evaluated. Results: A total of 848 cases (664 males, and 184 females, male/female ratio, 3.6 :1) were included in the study. A total of 270 (31.8 %) cases had Simon's bleeding. A significant difference in the frequency of Simon's bleeding exists among various causes of death. A 28.5 % (n = 77) of the cases with Simon's bleeding were in the group with hanged death cases (p < 0.001). Conclusion: Splinter bleedings identified originally by Simon on the ventral, and later dorsal aspects of the spinal disci in cases of hanging were also observed later in deaths not related to hanging, however it was concluded that these types of bleeding could not be detected in cases of postmortem hanging. When we evaluated all groups, the results we obtained do not support the assertion that the incidence of Simon's bleeding decreases with aging. Instead, when compared with all other groups, the incidence of Simon's bleeding was also higher in cases of hanging with the highest mean age.