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Toktay, H.

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Toktay
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H.
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Toktay, H.
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0000-0003-0814-7237

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2012 - 20183
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Region: Türkiye × AGROVOC: CEREALS ×

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Now showing 1 - 3 of 3
  • Thumbnail Image
    Morphometric and genetic variability among Mediterranean cereal cyst nematode (Heterodera latipons) populations in Turkey
    (The Scientific and Technology Research Council of Turkey, 2018) Imren, M.; Yildiz, S.; Toktay, H.; Duman, N.; Dababat, A.A.
    The Mediterranean cereal cyst nematode, Heterodera latipons, is an important plant parasitic nematode that negatively impacts cereal production worldwide, particularly in the Mediterranean Basin. Successful control of cereal cyst nematodes requires knowledge of the nematode species/pathotypes and their biology. However, little information is currently available concerning the phenotypic and genotypic variability of H. latipons populations in Turkey. This study analyzed the morphological/morphometric and genetic characteristics of Turkish H. latipons populations to define intraspecific distinctions between them. Morphological and morphometric studies focused on the pattern of the perineal region of cysts and second stage juveniles (J2), while the molecular analyses used sequenced ITS-rDNA regions targeting the internal transcribed spacer (ITS) region of rDNA. The data from these investigations demonstrate that nematode populations from Adana and Hatay provinces differ from the populations collected in Kilis, Gaziantep, and Mardin provinces. These phenotypic and genotypic differences between H. latipons populations may indicate that they are heterogenic, with at least two pathotypes. To date, this study is the most comprehensive analysis identifying H. latipons populations in major wheatproducing areas of Turkey.
    Publication
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    Ocurrence and identification of cereal cyst nematode, heterodera filipjevi (nemata: heteroderidae), in Bolu province of Turkey
    (Organization of Nematologists of Tropical America, 2016) Imren, M.; Toktay, H.; Kutuk, H.; Dababat, A.A.
    Cereal cyst nematodes, Heterodera filipjevi, parasitize the roots of wheat and cause significant yield losses around the world. Cereal cyst nematodes are one of the most important and endemic problems in wheat-growing areas especially where rainfall is limited and monoculture crop production practices exist. In Turkey, cereal cyst nematodes are considered among the most damaging pests in wheat. Identifying cyst nematode species and determining their prevalence and distribution in Turkey are important for predicting potential spread in the future. This survey aimed to identify cyst nematode species and to assess their prevalence in cereal growing areas of Bolu province in Turkey. Cereal cyst nematode cysts were found in 83% of the surveyed fields. Prevalence of cysts was greater in cereal-growing areas in the provincial center and in the Gerede district. Morphological features of second-stage juveniles and cysts were examined, and DNA was extracted from second-stage juveniles and the species-specific Sequence Characterized Amplified Region (SCAR) primers were used for molecular identification. Based on both morphological and molecular methods, all samples were identified as H. filipjevi. This study was the first comprehensive investigation of H. filipjevi prevalence in cereal fields in Bolu. This information is of value to alert personnel of wheat breeding programs to develop local resistant varieties to target H. filipjevi.
    Publication
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    Molecular characterization of cereal cyst nematodes from South Anatolian region in Turkey using ITS-rDNA sequences
    (Türkiye Entomoloji Derneği, 2012) Imren, M.; Waeyenberge, L.; Viaene, N.; Toktay, H.; Dababat, A.A.; Elekcioglu, I.H.
    The Heterodera avenae group includes 12 species feeding on roots of cereals. Three species, Heterodera avenae Wollenweber, 1924, Heterodera filipjevi (Madzhidov, 1981) Stelter, 1984 and Heterodera latipons Franklin, 1969 are among the most economically important cyst nematode pests towards cereals cultivated in different parts of Turkey. In this study, forty seven cereal cyst nematode isolates collected from cereal growing areas of South Anatolian Region of Turkey (Hatay, Kahramanmaraþ, Gaziantep, Kilis, Mardin and Adýyaman), were identified using sequence analysis of the Internal Transcribed Spacer region of the ribosomal DNA (ITS-rDNA). Based on phylogenetic analysis using ITS-rDNA sequences, H. avenae, H. filipjevi, H. latipons and Heterodera ciceri Vovlas, Greco & Di Vito, 1985 were identified. According to our results, 76,5 % of the isolates could be characterized as H. latipons, 13 % H. filipjevi, 8,5 % H. avenae and 2 % H. ciceri.
    Publication