Onur Sefa ALKAÇ

Dr. Onur Sefa ALKAÇ

orcid

Research Focus & Metrics

Academic Career Length

7Years (2020-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 August 2022 in Mustafa Kemal Üniversitesi Tarım Bilimleri Dergisi
Verified
Journal Article
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OAOnur Sefa ALKAÇ
Onur Sefa ALKAÇ
SBSabriye Belgüzar
Sabriye Belgüzar
EÖEsra Öndeş
Esra Öndeş
FOFulya Okatar
Fulya Okatar
ZKZeliha KAYAASLAN
Zeliha KAYAASLAN
Amaç: Bu çalışma, bitki gelişimini teşvik eden farklı kök bakterisi ve mikoriza uygulamalarının kesme çiçek ve dış mekân süs bitkisi olarak dünya genelinde üretimi yaygın olan ve Türkiye’de de gittikçe yaygınlaşan Dahlia variabilis (Yıldız çiçeği) bitkisinde tohumdan fideye kadar geçen aşamada, büyüme ve gelişimine etkilerini belirlemek amacıyla yapılmıştır. Yöntem ve Bulgular: Çalışma kapsamında, Dahlia variabilis ‘Violet’ çeşidine ait tohumlara, Enterobacter cloacae (ZE-2), Bacillus cereus (ZE-7), Pseudomonas putida (ZE-12), Acinetobacter calcoaceticus (ZE-13), Burkholderia cepecia (7-a-2) bakteri türleri ve ticari olarak satışı bulunan mikoriza (5000 ppm) uygulanmıştır. Çalışmada, uygulamaların fide büyüme ve gelişimine etkilerini belirlemek için; çimlenme oranı (%), fide boyu (cm), gövde çapı (mm), yaprak sayısı (adet), bitki yaş ağırlığı (g), bitki kuru ağırlığı (g), kök uzunluğu (cm), kök yaş ağırlığı (g), kök kuru ağırlığı (g) ve SPAD değeri ile klorofil içeriği ölçülmüştür. Çalışma sonunda, yapılan uygulamaların Yıldız çiçeği üzerinde farklı etkilere sahip olduğu belirlenmiştir. Pseudomonas putida (ZE-12) uygulamasının kontrole kıyasla %12 oranında çimlenmeyi artırdığı, Acinetobacter calcoaceticus (ZE-13) bakterisinin fide boyunda %32.9’luk artış sağladığı belirlenmiştir. Genel Yorum: Sonuç olarak, bu çalışma ile doğal kökenli olan ve çevreye zararı olmayan bu bakterilerin süs bitkilerinde fide yetiştiriciliğinde kullanılabilme potansiyeline sahip olduğu belirlenmiş olup, süs bitkileri üretim sektöründe bu uygulamaların kullanımının yaygınlaştırılması önem arz etmektedir. Çalışmanın Önemi ve Etkisi: Dahlia bitkisi, Dünya’da tanınmasına rağmen Türkiye’de bu konuda pek fazla bilgi bulunmamaktadır. Ayrıca Dahlia bitkisinin tohumdan fide aşamasına kadar geçen sürede, daha kaliteli fideler elde etmek için yeni izole edilen bakteri türlerinin kullanımı da oldukça sınırlıdır. Bu çalışma ile sürdürülebilir yöntemler arasında yer alan bakteri ve mikoriza uygulamaları ile fide kalitesini iyileştirmek önem arz etmektedir.

11 May 2023 in Emirates Journal of Food and Agriculture
Verified
Journal Article
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OAOnur Sefa ALKAÇ
Onur Sefa ALKAÇ
SBSabriye Belgüzar
Sabriye Belgüzar
MGMehmet Güneş
Mehmet Güneş
Among the cut flowers, carnations are sensitive to ethylene. Therefore, the vase life is short and a negative situation arises in terms of marketing. Different chemical preservatives, herbal essential oils and growth regulators are used today to extend the post-harvest life of cut flowers. This study was conducted to determines the effects of single-use of some organic acids, chemical acids and essential oils and their combinations with sugar on postharvest life (vase life) of cut carnation flowers. Experiments were conducted in randomized plots design with three replications. Experimental treatments included: Salicylic Acid (100 mg/L), Ascorbic Acid (100 mg/L), Citric Acid (200 mg/L), Benzyl Adenine (50 mg/L), Carvacrol (200 mg/L), Thymol (200 mg/L) and sugar-supplemented (10 g/L) combinations of these treatments. Measured parameters included: Vase life, relative fresh weight, daily vase solution uptake, total vase solution uptake, pH change, bacteria population and diagnosis of dominant bacteria. Among the present treatments, 200 mg/L citric acid treatment decreased the bacteria population, prevented blockage in the plant's stem section, and thus, promoted water uptake. Thus, the best outcomes in terms of vase life, total vase solution uptake and relative fresh weights were achieved with 200 mg/L citric acid treatment. It was also observed that Salicylic Acid (100 mg/L) + Sucrose (10 g/L) and Benzyl Adenine (50 mg/L) + Sucrose (10 g/L) treatments yielded expected outcomes. Besides, non-sugar containing vase solutions yielded better outcomes than sugar-supplemented combinations. In terms of pH changes, decreases were observed in the final pH values of sugar-supplemented solutions compared to the initial pH values. Additionally, in present vase solutions, mostly Burkholderia cepacia species were diagnosed and also Pseudomonas antarctica, Pectobacterium carotovorum, Xanthomonas hortorum, Pseudomonas chlororaphis bacteria colonies were identified. As a result of the study, it is thought that 200 mg/L citric acid treatment and 100 mg/L salicylic acid + 10 g/L sugar treatment will contribute to cut flower and cut carnation producers and researchers working in this in the post-harvest field. Keywords: Bacteria; Benzyl adenine; Citric; Environment-friendly; Sugar

5 January 2022 in Turkish Journal of Agriculture - Food Science and Technology
Verified
Journal Article
Closed access
SASeda Bice Ataklı
Seda Bice Ataklı
SŞSezer Şahin
Sezer Şahin
OAOnur Sefa ALKAÇ
Onur Sefa ALKAÇ
In this study, a pot study was carried out to reveal the effects of direct and foliar applications of humic acid to the growing medium in addition to basic fertilization on the development and plant quality characteristics of lily plants grown in peat + perlite medium. The experiment was carried out in an unheated greenhouse during the summer, in a greenhouse environment with a shade net on it. In the experiment, in addition to the control, the humic acid doses were 3.5 lt/da from soil, 7.5 lt/da from soil, 1.75 lt/da from leaf, 3.75 lt/da from leaf and soil + 3.5 lt/da from leaf + 1, It was applied 3 times as 75 lt/da. In the pot experiment established in three replications according to the randomized plots trial design, 10 lily bulbs were planted in each pot and humic acid applications were made at two-week intervals following plant emergence. In order to see the effect of the applications when the plant is harvested, the length of the flower stem (mm), the thickness of the flower stem (mm), the fresh weight of the branch (mm), the number of buds (pieces), the bud length (cm), the number of leaves (pieces), Full bloom stem (mm) and vase life (days) were examined. As the doses of humic acid increased, the vegetative weight of the lily plant increased, while the effect of the applications on the investigated properties was different. With the mineral elements, hormones and plant growth regulators in humic acid, it has the feature of promoting the increase of biomass in the plant.

1 December 2020 in Ornamental Horticulture
Verified
Journal Article
Open access
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OAOnur Sefa ALKAÇ
Onur Sefa ALKAÇ
OÖOsman Nuri Öcalan
Osman Nuri Öcalan
MGMehmet Güneş
Mehmet Güneş

30 December 2022 in Turkish Journal of Agriculture - Food Science and Technology
Verified
Journal Article
Open access
PDF file
OAOnur Sefa ALKAÇ
Onur Sefa ALKAÇ
SBSabriye Belgüzar
Sabriye Belgüzar
ZKZeliha KAYAASLAN
Zeliha KAYAASLAN
ETEsat Tuncel
Esat Tuncel
SASümeyye Aldırmaz
Sümeyye Aldırmaz
This study was carried out to determine the effects of plant growth-promoting rhizobacteria and mycorrhiza treatments on the development of Zinnia elegans L. ‘Zesty’ and Dahlia variabilis L. ‘Figaro Violet’ cultivars. In the study, a suspension was first prepared from bacterial isolates developed at 25±2 °C for 24 hours. The prepared suspensions were adjusted to an absorbance value of 0,3 at 600 nanometers in a spectrophotometer. D. variabilis seedlings were immersed in suspensions prepared from ZE-12, ZE-13 and ZE-12+ZE-13, Z. elegans seedlings were immersed in suspensions prepared from ZE-2, ZE-7, ZE-12, ZE-13, ZE-12+ZE-13 for 30 minutes. In addition, Z. elegans seedlings were kept in mycorrhiza prepared at a concentration of 5000 ppm for 10 seconds. At the end of the period, flower seedlings were planted in pots with a mixture of peat and perlite. As the control group, seedlings without rhizobacteria and mycorrhiza treatment were used in both cultivars. The experiment was established with 3 replications and 10 plants per replication. The applications made in the D. variabilis experiment remained the same as the control in all other parameters except root dry weight. ZE-13 application was effective on root dry weight. It was determined that the applications made in Z. elegans seedlings increased the flower stem thickness and the number of leaves, especially the ZE-13 application was the most effective application. In conclusion, with this study, it was revealed that rhizobacteria and mycorrhiza applications, which are of natural origin and do not harm the environment, have the potential to be used in ornamental plants cultivation, and that these applications should be expanded.

25 March 2025 in Bahçe
Verified
Journal Article
Closed access
MTMuhammed Esad Tuncel
Muhammed Esad Tuncel
MGMehmet Güneş
Mehmet Güneş
OAOnur Sefa ALKAÇ
Onur Sefa ALKAÇ
Bu çalışmanın amacı, sıvılaştırılmış vermikompost ve humik asidin ‘Dynasty’ lale çeşidinin büyüme ve gelişim üzerindeki etkilerini incelenmiştir. 50 kg katı vermikompost, 50 L saf su ile karıştırılıp 72 saat bekletilerek sıvı vermikompost hazırlanmıştır. Elde edilen sıvı, 1:4 oranında seyreltilmiştir. Humik asit (HA) ise 0, 150, 300, 600 ve 900 ppm konsantrasyonlarında hazırlanmıştır. Sıvı vermikompost ve farklı HA dozları, ayrı ayrı ve birlikte karıştırılarak her bir soğana 125 mL uygulanmıştır. Kontrol grubuna ise 125 mL saf su verilmiştir. Yetiştirme ortamı olarak torf ve perlit (2:1 v:v) karışımı kullanılmıştır. Çalışmada gübreleme için EC 1.10 dS m⁻¹ seviyesi uygulanmıştır. Uygulamaların etkilerini belirlemek amacıyla fenolojik gözlemler ve morfolojik özellikler incelenmiştir. ‘Dynasty’ lale çeşidinde, en uzun çiçek sapı (19.08 cm) 300 ppm HA uygulamasında, en uzun vazo ömrü (9.00 gün) vermikompost ve 300 ppm HA kombinasyonunda, en yüksek perianth uzunluğu (42.11 mm) ise 600 ppm HA uygulamasında elde edilmiştir. Vermikompostun uygulandığı laleler, kontrol grubuna göre daha olumlu sonuçlar vermiştir. Ticari yetiştiriciliğin yanı sıra organik materyal olarak kabul edilen HA ve vermikompost uygulamalarının ‘Dynasty’ lale çeşidinin gelişimine katkı sağladığı saptanmıştır. HA dozlarının 600 ppm konsantrasyonundan fazla miktarda kullanılmasının olumlu etkisinin olmadığı sonucuna varılmıştır.