Person: 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 18 results
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- Heterodera schachtii (Nematoda: Heteroderidae) associated with cabbage-cultivation systems in anatolia region of Türkiye(MDPI, 2024) Akyol, G.B.; Yüksel, E.; Elci, E.; Bozbuga, R.; Dababat, A.A.; Imren, M.; Toktay, H.
Publication - Resistance response of drought and heat tolerant spring wheat lines against the cereal cyst nematode, heterodera filipjevi(Ankara University, 2022) Atiya, O.; Dababat, A.A.; Erginbas Orakci, G.; Singh, S.; Toktay, H.
Publication - Incidence of cereal cyst nematodes in the East Anatolia Region in Turkey(Russian Society of Nematologists, 2015) Toktay, H.; Imren, M.; Ocal, A.; Waeyenberge, L.; Viaene, N.; Dababat, A.A.
Publication - Characterization of potato golden cyst nematode populations (Globodera rostochiensis) in Turkey(Friends Science Publishers, 2020) Toktay, H.; Evlice, E.; Imren, M.; Özer, G.; Muhammad Amjad Ali; Dababat, A.A.
Publication - Phytophagous nematodes in cereal fields in Niğde Province, Turkey(Entomological Society of Turkey, 2020) Toktay, H.; Imren, M.; Akyol, B.; Evlice, E.; Riley, I.T.; Dababat, A.A.
Publication - 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 - Resistance to cereal cyst nematodes in wheat and barley: an emphasis on classical and modern approaches(MDPI, 2019) Muhammad Amjad Ali; Mahpara Shahzadi; Adil Zahoor; Dababat, A.A.; Toktay, H.; Allah Bakhsh; Muhammad Azher Nawaz; Hongjie LiCereal cyst nematodes (CCNs) are among the most important nematode pests that limit production of small grain cereals like wheat and barley. These nematodes alone are estimated to reduce production of crops by 10% globally. This necessitates a huge enhancement of nematode resistance in cereal crops against CCNs. Nematode resistance in wheat and barley in combination with higher grain yields has been a preferential research area for cereal nematologists. This usually involved the targeted genetic exploitations through natural means of classical selection breeding of resistant genotypes and finding quantitative trait luci (QTLs) associated with resistance genes. These improvements were based on available genetic diversity among the crop plants. Recently, genome-wide association studies have widely been exploited to associate nematode resistance or susceptibility with particular regions of the genome. Use of biotechnological tools through the application of various transgenic strategies for enhancement of nematode resistance in various crop plants including wheat and barley had also been an important area of research. These modern approaches primarily include the use of gene silencing, exploitation of nematode effector genes, proteinase inhibitors, chemodisruptive peptides and a combination of one or more of these approaches. Furthermore, the perspective genome editing technologies including CRISPR-Cas9 could also be helpful for improving CCN resistance in wheat and barley. The information provided in this review will be helpful to enhance resistance against CCNs and will attract the attention of the scientific community towards this neglected area.
Publication - 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 - Association analysis of resistance to cereal cyst nematodes (Heterodera avenae) and root lesion nematodes (Pratylenchus neglectus and P. thornei) in CIMMYT advanced spring wheat lines for semi-arid conditions(Japanese Society of Breeding, 2016) Dababat, A.A.; Gomez-Becerra, H.F.; Erginbas Orakci, G.; Dreisigacker, S.; Imren, M.; Toktay, H.; Elekcioglu, I.H.; Tesfamariam Mekete; Nicol, J.M.; Ansari, O.; Ogbonnaya, F.C.To identify loci linked to nematode resistance genes, a total of 126 of CIMMYT advanced spring wheat lines adapted to semi-arid conditions were screened for resistance to Heterodera avenae, Pratylenchus neglectus, and P. thornei, of which 107 lines were genotyped with 1,310 DArT. Association of DArT markers with nematode response was analyzed using the general linear model. Results showed that 11 markers were associated with resistance to H. avenae (pathotype Ha21), 25 markers with resistance to P. neglectus, and 9 significant markers were identified to be linked with resistance to P. thornei. In this work we confirmed that chromosome 4A (~90–105 cM) can be a source of resistance to P. thornei as has been recently reported. Other significant markers were also identified on chromosomal regions where no resistant genes have been reported for both nematodes species. These novel QTL were mapped to chromosomes 5A, 6A, and 7A for H. avenae; on chromosomes 1A, 1B, 3A, 3B, 6B, 7AS, and 7D for P. neglectus; and on chromosomes 1D, 2A, and 5B for P. thornei and represent potentially new loci linked to resistance that may be useful for selecting parents and deploying resistance into elite germplasm adapted to regions where nematodes are causing problem.
Publication - Resistance of winter wheat to Heterodera filipjevi in Turkey(The Scientific and Technology Research Council of Turkey, 2014) Dababat, A.A.; Erginbas Orakci, G.; Toktay, H.; Imren, M.; Akin, B.; Braun, H.J.; Dreisigacker, S.; Elekcioglu, I.H.; Morgounov, A.Cereal cyst nematodes (CCNs) are plant parasites that significantly limit global cereal production. The most frequently reported pathogenic species are Heterodera avenae, H. filipjevi, and H. latipons. One of the most cost-effective, environmentally friendly, and easily adopted control measures is the use of genetic host resistance, which maintains nematode populations below the economic damage threshold level. Many effective sources of resistance to CCNs have been identified in cereals; however, their effectiveness and usefulness is dependent on the interaction of the specific putative resistant accession and the CCN pathotype found in a specific region. In this study, 719 wheat lines from the Facultative and Winter Wheat Observation Nurseries, representing a broad geographical spectrum of breeding lines and varieties from Europe, Central Asia, and the International Winter Wheat Improvement Program, were screened against H. filipjevi under controlled conditions. The results indicated that 114 and 90 genotypes were ranked resistant and moderately resistant, representing 15.8% and 12.5% of the screened genotypes, respectively. The frequency of resistant genotypes observed in the germplasms varied significantly among the different original countries and was the highest for genotypes that originated from Bulgaria (59.3%). From those phenotyped germplasms, a set of 289 lines was genotyped to understand if resistance sources are located at the same site or originate from different locations in the genome.
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