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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 - 20194
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AGROVOC: WHEAT × AGROVOC: DISEASE RESISTANCE ×

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Now showing 1 - 4 of 4
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    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 Li
    Cereal 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
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    Identification of genetic resistance to cereal cyst nematodes; Heterodera avenae (Wollenweber, 1924), Heterodera filipjevi (Madzhidov, 1981) Stelter and Heterodera latipons (Franklin, 1969) in some international bread wheat germplasms
    (Entomological Society Turkey, Ege University, 2013) Imren, M.; Toktay, H.; Bozbuga, R.; Erginbas Orakci, G.; Dababat, A.A.; Elekcioglu, I.H.
    The cereal cyst nematodes, Heterodera avenae group, are known as parasites of cereals worldwide. In Turkey, the cereal cyst nematodes, Heterodera filipjevi, H. avenae and H. latipons, are the three known species infested wheat fields and cause high yield losses. The using of resistance varieties is one of the most effective methods for controlling cereal cyst nematodes. Recently, resistance genes (Cre genes) which are obtained from wild wheat genotypes have been transferred into bread wheat varieties to control the cereal cyst nematodes species. In this study, the efficiency of some sources of resistance (CreR, Cre1, Cre2, Cre3, Cre7 and Cre8) in wheat against some Turkish H. avenae, H. filipjevi and H. latipons populations was investigated in-vitro conditions. According to results, the effect of resistance genes showed variation depending on different Cereal cyst nematode populations; H.avenae, H. filipjevi and H. latipons. Although Cre1 gene was only found as completely resistant to all (three) nematode species, Cre3 and Cre7 were found resistant to H. avenae and H. latipons. Cre R was also determined as resistant to H. filipjevi and H. latipons populations but Cre8 was only found resistant against to H. filipjevi population. No resistance was found in Cre 2 gene against to all nematode populations. Additionally, 2 resistance gene-free variety and lines were found resistant to H. avenae; 3 wheat lines to H. filipjevi and 11 wheat genotypes were found moderately resistant to H. latipons.
    Publication
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    Pathotype characterization of the cereal cyst nematode Heterodera filipjevi (Madzhidov, 1981) Stelter in Turkey
    (Entomological Society Turkey, Ege University, 2013) Toktay, H.; Imren, M.; Bozbuga, R.; Erginbas Orakci, G.; Dababat, A.A.; Elekcioglu, I.H.
    Turkey is ranked among top ten wheat producing countries in the world. Cereal cyst nematodes are considered one of the most damaging plant parasitic nematodes on wheat worldwide. Up to date, the most effective method of controlling this group of nematodes is the use of crop rotation and resistant varieties. The successful development of disease-resistant plants is contingent on knowledge of the pathotypes of the causal agent. In this study, three populations of Heterodera filipjevi (Madzhidov, 1981) Stelter were collected from different locations (Afsin, Elbistan and Yozgat) in Turkey in order to identify their pathotype using ?The International Test Assortment of Cereal Cultivars?. The results showed that two populations gave a similar reaction to the resistant and susceptible varieties. These populations were determined as Ha 33 pathotype which is a new report for Turkey.
    Publication
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    Improved methodology for resistance screening in spring wheat against the root lesion nematode, Pratylenchus thornei (Sher et Allen) (Tylenchida: Pratylenchidae)
    (Entomological Society Turkey, Ege University, 2012) Toktay, H.; Imren, M.; Nicol, J.M.; Dababat, A.A.; Elekcioglu, I.H.
    The root lesion nematode, Pratylenchus thornei (Sher et Allen) is a polyphagous and economically important nematode in wheat production systems, particularly in rainfed environments. Chemical management of this nematode is not economically or environmentally sound, leaving cultural practices like crop rotation as the most widely accepted option. Long-term control is best achieved in established wheat monoculture systems through genetic improvement, which provides both economic and environmental benefits to the growers. Intensive screening under controlled conditions can facilitate and accelerate the identification of resistance and its subsequent deployment in commercial wheat cultivars. In this study, a number of variables were assessed to optimize P. thornei screening, including initial nematode density, soil type, container size, reference cultivars, harvest time and watering regime with perlite. Growth room experiments showed clear separation between the resistant and susceptible cultivars, using sandy growth edium (70:29:1 sand, field soil and organic matter), small container (15 mm diameter x 100 mm in long), inoculation density with 400 individuals per plant, 9 week growing period and bottom perlite irrigation system.
    Publication