Browsing by Author "Demirer-Durak, Emre"

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Anastomosis Groups and Pathogenicity of Rhizoctonia Species From Strawberry Plants in Erzurum Province, Turkey
(Parlar Scientific Publications (p S P), 2018) Demirer-Durak, Emre; Demirci, Erkol
Black root rot in strawberry is a disease complex of several different fungi including Rhizoctonia species. This study was carried out to identify anastomosis groups and pathogenicity of Rhizoctonia isolates from the root of strawberry plants in the province of Erzurum, in Eastern Anatolia, Turkey. Three hundred and six Rhizoctonia isolates were obtained, and their anastomosis groups (AGs) were identified. Of these isolates, 17.3 % were Rhizoctonia solani, and 82.7 % were binucleate Rhizoctonia. R. solani isolates were determined as AG-2-1 (2 isolates) and AG-3 (51 isolates), and binucleate Rhizoctonia isolates were AG-A (186 isolates), AG-G (56 isolates), AG-H (4 isolates) and AG-K (7 isolates). The selected isolates representing the each anastomosis group were subjected to sequence analysis and the results were also confirmed as molecular. In pathogenicity tests on strawberry plants (cv. Fern), the most virulent groups were determined as AG-A, AG-G, AG-K and AG-3, whereas the weak virulent ones were AG-H and AG-2-1. The anastomosis groups of Rhizoctonia isolates obtained from strawberry plants in Turkey were determined for the first time in this study. Additionally, binucleate Rhizoctonia AG-H was also new record in Turkey.
Anastomosis Groups, Pathogenicity and Biological Control of Rhizoctonia Species Isolated From Pepper (Capsicum Annuum L.) Plants in Lake Van Basin
(Parlar Scientific Publications (p S P), 2018) Demirer-Durak, Emre
This study was conducted to determine anastomosis groups, pathogenicity and biological control of Rhizoctonia spp. from pepper (Capsicum annuum L.) plants in Lake Van Basin during 2013-2014. Sixty seven isolates of Rhizoctonia spp. were obtained from roots of pepper. Among these isolates, multinucleate anastomosis groups (AG) AG-2, AG 3, AG-4 and AG-5, binucleate AG-K were recorded in the rate of 13,4%, 9%, 62,7%, 4,5% and 10,4%, respectively. In pathogenicity tests on pepper plants, the most virulent group was determined as AG-4, it was followed AG-2, whereas the weak virulent ones were AG-3 and AG-K, isolate of AG-5 was nonpathogenic. A total of 25 isolates of biological control agents belonging to Trichoderma harzianum (44%), T. viride (24%), T. virens (20%) and Gliocladium roseum (12%) were obtained from the roots of pepper plants. The effectiveness of the biological control agents against the most virulent isolate (AG 4 Rs 55) were determined using in vitro and in vivo tests. In vitro tests the most effective isolates were determined as T. harzinum (64,5%), T. viride (58,1%), T virens (57,4%). Whereas G. roseum (35,4%) was the weak inhibition to Rs55. According to the results of in vitro test, isolates showed the highest inhibition against Rs55 were selected, and used in vivo tests. Disease severity and plant growth parameters (plant heigh, shoot and root fresh and dry weights) were evaluated 8 weeks after sowing. According to in vivo test, while T harzianum was found to be the most effective species, T. viride and T virens were moderately, and G. roseum was the least effective genus.
Evaluation of Arbuscular Mycorrhizal Fungi (Amf) and Whey on Rhizoctonia Disease of Potato Caused by Rhizoctonia Solani Kuhn
(Parlar Scientific Publications (p S P), 2018) Demirer-Durak, Emre; Demir, Semra; Ocak, Elvan
This study investigated the effects of Arbuscular Mycorrhizal Fungi (AMF) and whey on the growth of potato (Solanum tuberosum L.) and Rhizoctonia solani disease. Experiments were carried out in a greenhouse with three different AMF applications (Glomus mossease, commercial AMF, mixed AMF), whey and Rhizoctonia solani AG-3. The study findings indicated that application of AMF and whey had positive effects on plant growth and that AMF development was enhanced by whey application. Growth components (plant height, shoot fresh and dry weights, root fresh and dry weights) increased significantly with AMF and whey application when compared to control as well as plants inoculated with R. solani alone. AMF and whey also significantly reduced the harmful effects of the disease. These applications reduced the severity of R. solani disease by between 40% and %53. Mixed AMF combined with whey had the best affinity in terms of both AMF colonization (73%) and mycorrhizal dependency (30,3). Combinations of two treatments were more effective than individual applications.