Browsing by Author "Akkopru, A."
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Conference Object Determination of Bacterial Disease on Stone Fruits Grown in Lake Van Basin, East Anatolia of Turkey(int Soc Horticultural Science, 2016) Akkopru, A.Stone fruits are an economically very important product especially in the eastern region of Turkey which is the biggest producer of dry and fresh apricot all over the world. Lake Van Basin is located in this region and it has a common border with Iran. In this respect, it is an important region for passing quarantine plant pathogens. Pseudomonas syringae pathovars were isolated in other regions of Turkey. But Xanthomonas arboricola pv. pruni has not yet been detected, and it is in the list of quarantine pathogens in Turkey. The goal of the this study was to determine the bacterial diseases on apricot, plum, peach, sweet and sour cherry trees in Lake Van Basin. Immature sweet cherry fruits were used for pathogenicity test. Sequence analysis of the 16S rRNA gene region was done using 27F and 1492R primers. Rhodotorula pilimanae strain MUCL 30397 and specific primers of cfl gene were used to determine the specific toxin - syringomycine and coronatin - production. Also, LOPAT and GATTa were used as other identification tests. In this study, 92 stone fruit orchards were visited and 69 suspect samples were collected. Bacterial pathogens were isolated from all provinces and districts in Lake Van Basin. Among the pathogens obtained there was no Xanthomonas axonopodis pv. pruni, and all of them were identified as Pseudomonas syringae pathovars. Two pathovars of Pseudomonas syringae were detected at the rate of 44% P. syringae pv syringae and 56% P. syringae pv. morsprunorum.Article Effects of Endophytic Bacteria on Some Physiological Traits and Nutrient Contents in Pepper Seedlings Under Drought Stress(Centenary University, 2021) Sadak, A.; Akkopru, A.; Sensoy, S.The present study was conducted to determine the effects of the endophytic bacteria (EB) on some physiological traits and nutrient contents in pepper (Capsicum annuum L.) seedlings grown under drought stress. The pepper cv. Mostar F1 and two EB isolates [Bacillus thurigiensis (CA41/1) and Ochrobactrum sp. (CB36/1)] were employed under drought stress condition. The first EB application was at a density of 108 CFU mL-1 as 10 mL plant-1 at the first cotyledon leaf stage and the second one was two weeks later. The seedlings were irrigated by gravimetric method on a regular basis every two days. Twenty days after EB application, irrigation was terminated completely in half of the applications in order to form drought stress for 7 days. Among the studied traits, membrane damage index, leaf relative water content, amount of malondialdehyde, catalase enzyme activity, ascorbate peroxidase enzyme activity, and the contents of some mineral elements (K, Ca and Mg) were significantly different in drought stressed seedlings compared the control (regularly irrigated) seedlings. EB (Especially CA41/1) had generally positive effects on most studied traits, whereas drought stress had generally negative effects on the mentioned traits. There might be a high potential of EB fighting against drought stress in pepper; however, one keeps in mind that there is variation in the performance of EB; therefore, the best EB combinations have to be determined even for cultivars in each plant species in future studies. © 2021, Centenary University. All rights reserved.Article Evolution of Common Beans Collected From Lake Van Basin for Their Resistance To the Common Bacterial Blight (Xanthomonas Axonopodis Pv. Phaseoli)(Corvinus Univ Budapest, 2018) Erdinc, C.; Ekincialp, A.; Akkopru, A.; Yildiz, M.; Sensoy, S.The present study determined the reactions of common bean landraces grown in Lake Van Basin of Turkey against common bacterial blight disease (CBB) caused by Xanthomonas axonopodis pv. phaseoli (Xap). For this purpose 83 bean landraces collected from the basin and two resistant (HR-45, HR-67) and one susceptible (Dresden) lines were evaluated for their reaction to Xap. The experiments were conducted in randomized experimental design with three replications in a growth chamber having 23 +/- 2 degrees C temperature and 16 h light-8 h dark period. Bean seeds were sown in the pots having 2: 1 mixture of peat: perlite and Xap inoculated by spraying when the seedlings reached two trifoliate leaves stage. Disease severity was assessed three weeks after Xph inoculation using 1-5 scale. In light of the findings, it was detected that there was a variation with regard to tolerance to the disease among common bean landraces. While fourteen landraces were assigned as resistant against CBB, 49 landraces were found to be moderately susceptible to CBB. The present study demonstrated the existence of resistance sources against CBB within Lake Van Basin bean landraces that could potentially be used for breeding resistant cultivars.Book Part Use of Arbuscular Mycorrhizal Fungí for Biocontrol of Soilborne Fungal Plant Pathogens(CRC Press, 2024) Demir, S.; Akkopru, A.A key and universally accepted concept is that natural microbial populations in soil or other living substrates are associated with growth around developing plant roots, giving rise to the so-called rhizosphere (Azcón-Aguilar and Barea, 1992). As a rhizosphere develops at the root-soil interface, microorganisms there interact with both plant roots and soil constituents. Communication among these components is mainly via chemical or biochemical signals, although physical interaction is also possible (Azcón-Aguilar and Barea, 1996). © 2007 by The Haworth Press. Inc. All rights reserved.