Yazar "Can, Hasan" seçeneğine göre listele

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    Collection of local Kyrgyzstan Melon genotypes and determination of morphological relationships between some Anatolian Melons
    (Tubitak Scientific & Technological Research Council Turkey, 2022) Can, Hasan; Turkmen, Onder
    Collection, characterization, and protection of genetic resources are among the high-priority issues of increasing importance throughout the world, especially for the breeding and release of novel cultivars. To understand and describe the characteristics of germplasm, the morphological status of genetic resources must accurately represent their agricultural applications. In this study, the genotypes of melon in Kyrgyzstan were collected by visiting several regions and contacting farmers. The genetic diversity of 35 Kyrgyz and 13 Turkish melon accessions was characterized based on the corresponding phenotypes. The morphological characterizations were largely based on the IPGR and, to some extent, UPOV standards. The genotypes from the collections of both countries were separated into three main clusters using the ward method. It was demonstrated that among the 40 morphological parameters, the fruit-related characteristics contributed most significantly to the separation of genotypes in the PCA analysis, and the results of the PCA analysis also validated the cluster analysis. According to the squared eigenvalues, the accessions Kg-G and C-09 were observed to be the closest related genotypes, whereas the accessions Kav-3 and YYU-13 were the most distantly related. Accessions YYu-22, C-02, and C-03 were observed to have the heaviest fruits, Manas-6 and Os-02 were observed to have the highest fruit flesh thickness, and C-08 was determined to have the highest SSC contents among all the accessions. It was observed that the characteristics of melon fruits from both countries differed significantly.
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    Melatonin Application at Different Doses Changes the Physiological Responses in Favor of Cabbage Seedlings (Brassica oleracea var. capitata) Against Flooding Stress
    (Springer, 2023) Can, Hasan
    In recent physiology studies, the number of chemical-based agents applied to allow the recovery of plants under different stress conditions has greatly increased, and melatonin is one significant novel one among these agents. Extremely high and low precipitation regimes are two of the most important factors limiting agricultural production and resulting in drought and flooding stresses. The present study aimed to investigate the effects of melatonin on the physiological responses of early-growth stage seedlings to flooding stress. In this context, cabbage seedlings were subjected to excess water followed by measurement of the essential parameters, such as photosynthesis, antioxidant enzymes, chlorophyll fluorescence, and certain agronomic features. The results indicated that underground fresh mass (UFM) and dry mass (UDM), leaf area (LA), chlorophyll (Chl b) content, carotenoid (CT) content, relative water content (RWC), and protein (PT) content in cabbage seedlings were increased, while the levels of chlorophyll fluorescence (Fv/Fm) and superoxyde dismutase (SOD), peroxidase (POX), and catalase (CAT) levels were stable in flooding-stressed cabbage seedlings treated with 150 mu M melatonin. Proline content was significantly reduced in the 150 mu M melatonin treatment group. The photosynthetic parameters of cabbage seedlings under the flooding stress condition were not much affected by changes in the stoichiometry of the Chla and Chlb ratio. Consequently, improvements were observed at varying rates, and the effects of flooding stress were alleviated in the melatonin-treated cabbage seedlings. It was, accordingly, inferred that treatment with 150 mM melatonin exerted substantial effects in terms of suppressing the detrimental effects of flooding stress in cabbage seedlings.
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    Molecular and Physiological Responses to Exogenously Applied Melatonin in Spinach Under Deficit Irrigation Conditions
    (Springer, 2024) Seymen, Musa; Yavuz, Duran; Can, Hasan; Kiymaci, Gulbanu; Turkmen, Onder; Paksoy, Mustafa; Yavuz, Nurcan
    Melatonin, an important phytochemical, encourages plants to redirect growth in response to environmental stresses. The study aims to investigate the changes in the morphological, physiological, biochemical, and molecular properties of spinach subjected to the exogenous application of melatonin (MEL) at different doses under different water stress. The following four irrigation levels were applied: I100 (complete irrigation), I80 (20% water deficit), I60 (40% water deficit), and I40 (60% water deficit). MEL was applied through a spray on the leaves in three doses-0, 50, and 100 mu M. In the present study, the application of MEL50 exhibited no significant decrease in water use efficiency (WUE) at the I80 irrigation level compared to the I100 irrigation level, while a significant decrease in the WUE was observed beyond this point. The application of MEL contributed to influencing the morphological parameters while also positively affecting the photosynthesis activity and, contribution to the antioxidant defense system. It was observed that the genes involved in the carbon metabolism of photosynthesis), the antioxidant mechanism, and the continuity of photosynthesis, all of which affect the expression of melatonin, facilitated water stress reduction in spinach. Therefore, it was inferred that the application of MEL50I80 could serve as an important irrigation strategy in semi-arid regions with limited water resources.
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    Plant-Endophyte Interaction during Biotic Stress Management
    (Mdpi, 2022) Pathak, Parul; Rai, Vineet Kumar; Can, Hasan; Singh, Sandeep Kumar; Kumar, Dharmendra; Bhardwaj, Nikunj; Roychowdhury, Rajib
    Plants interact with diverse microbial communities and share complex relationships with each other. The intimate association between microbes and their host mutually benefit each other and provide stability against various biotic and abiotic stresses to plants. Endophytes are heterogeneous groups of microbes that live inside the host tissue without showing any apparent sign of infection. However, their functional attributes such as nutrient acquisition, phytohormone modulation, synthesis of bioactive compounds, and antioxidant enzymes of endophytes are similar to the other rhizospheric microorganisms. Nevertheless, their higher colonization efficacy and stability against abiotic stress make them superior to other microorganisms. In recent studies, the potential role of endophytes in bioprospecting has been broadly reported. However, the molecular aspect of host-endophyte interactions is still unclear. In this study, we have briefly discussed the endophyte biology, colonization efficacy and diversity pattern of endophytes. In addition, it also summarizes the molecular aspect of plant-endophyte interaction in biotic stress management.