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Öğe Determination of resistance against to cereal cyst nematode, heterodera avenae (wollenweber, 1924) in some wheat germplasm [Bazi bugday genotiplerinin tahil kist nematodu heterodera avenae (wollenweber, 1924) karsi dayanikliliklarinin arastirilmasi](2013) Imren M.; Toktay H.; Bozbuga R.; Dababat A.; Özkan H.; Elekçioglu I.H.The cereal cyst nematode, Heterodera avenae is one of the most important pests of wheat in many countries in the world with different climatic types. Heterodera. avenae is commonly distributed in the Eastern Mediterranean region of Turkey and all populations investigated belong to the Ha1 group, Ha21 pathotype. This study was aimed to found resistance sources from the national wheat varieties, wheat wild genotypes and international wheat genotypes against H. avenae Karlik-Adana population (Ha21 pathotype). Results showed that four national wheat varieties, seventeen wheat wild genotypes and twenty three international wheat genotypes were found to be moderately resistant against to Eastern Mediterranean Region of Turkey H. avenae population. Among these genotypes, the national bread wheat variety, Adana 99 (PFAU/SERI82// BOG"S"), some wild genotypes and international genotypes can be used in national wheat breeding programmes. However, Cre1 was not showed completely resistant against H. avenae. Additionally resistance sources in of Turkish national wheat and wild genotypes needs to be determined.Öğe Determining the optimal Meloidogyne Incognita inoculum level, inoculation time, pathogencity and gall development on tomato roots for resistance experiments in breeding programs(Society for Plant Research, 2015) Bozbuga R.; Imren M.; Kasapoglu E.B.; Toktay H.; Elekcioglu I.H.Root knot nematodes (RKN) cause a significant damage to many cultivated crops and present study was conducted to determine the most appropriate inoculum levels of a ubiquitous RKN nematode in warm climate, Meloidogyne incognita, inoculation time and plant age for the screening of nematode resistance studies on plant breeding programs under controlled conditions. The inoculum level experiment was conducted to investigate the effect of four M. incognita inoculum levels (1000, 1500, 2000, 2500 juveniles/ 1000 gram soil mix) on three different age of susceptible tomato plants. Gall development was observed at 3 different ages of susceptible tomato plants with 7 different time points. The highest gall numbers were observed on nematode infected 3 day old plant roots and the least number of galls were detected on the roots of 5 day old plants. First galls were observed at 1 dpi and the highest gall number was observed on the 21st gall counting day on three day old tomato roots. Thus the inoculation of 2000- 2500 second stage juveniles /1000 gram soil mix to 3 days old tomato plants was the best to reach high gall numbers which are suitable for screening of nematode resistance studies on plant breeding programs. © 2015 Society for Plant Research. All rights reserved.Öğe Identification of common bean (Phaseolus vulgaris) genotypes having resistance against root knot nematode meloidogyne incognita(Agricultural Research Communication Centre, 2015) Bozbuga R.; Yildiz Dasgan H.; Akhoundnejad Y.; Imren M.; Toktay H.; Kasapoglu E.B.Root knot nematodes (Meloidogyne spp.) cause immense yield losses in crops throughout the world. Use of resistant germplasms of plants limits the root knot nematode damages. In this study, 87 common bean (Phaseoulus vulgaris L.) genotypes were screened against the root knot nematode, Meloidogyne incognita to determine the resistance response under growth chamber conditions in Turkey. P. vulgaris genotypes were evaluated based on resistance index (RI); root galling severity and nematode egg mass production on a 1-9 scale. The nematode negatively influenced the growth (fresh weight) of bean genotypes. At the completion of the study, 13 bean genotypes were found as immune (Sehirali), highly resistant (TR42164, Seleksiyon 5, Seker Fasulye, Fas-Agadir-Suk-1) and moderately resistant (Acik Badem, TR68587, TR43477, TR53827, TR28018, Gülnar-3, Siyah Fasulye, Kibris Amerikan) against M. incognita thus suggesting the use of such genotypes in breeding studies as a parental material to develop the root knot nematode resistant cultivars. © 2015, Agricultural Research Communication Centre. All Rights Reserved.Öğe Investigation the efficiency of resistance gene, Cre1, against mediterranean cereal cyst nematode: Heterodera latipons franklin (Tylenchida: Heteroderidae) [dayani{dotless}kli{dotless}li{dotless}k geni Cre1'in akdeniz tahi{dotless}l kist nematodu, heterodera latipons franklin (Tylenchida: Heteroderidae)'e karşi{dotless} etkinliginin araşti{dotless}ri{dotless}lmasi{dotless}](Ankara University, 2014) Imren M.; Kasapoglu E.B.; Dababat A.; Toktay H.; Elekcioglu I.H.Cereal cyst nematodes (Heterodera avenae group) are important pests of wheat; they include the three most important species of cereal cyst nematodes: Heterodera avenae Wollenweber, H. latipons Franklin and H. filipjevi (Madzhidov) in Turkey that were determined in different wheat growing areas. It was reported that Mediterranean cereal cyst nematode, Heterodera latipons which is widely found in the centre of the durum wheat growing area -South-eastern Anatolia region- in our country was reaching the economical threshold in many locations. It is known that the use of resistant/tolerant wheat varieties is the most effective controlling method against cyst nematodes in the wheat cultivation. Nowadays, nine different resistance genes (Cre genes), which are transferred from wild wheat species to wheat cultivated forms are available. In this study, the efficiency of the resistance gene, Cre1, against the population of H. latipons from Gaziantep (Karkami{dotless}s) was investigated. In the study, 38 genotypes carrying Cre1 gene and 26 genomes lacking resistance genes; this gives a total 64 wheat genotypes which are produced by parental crossing of SILVERSTAR containing the resistance gene, Cre1, in its genome, SOKOLL, CALINGIRI, GOLDMARKER, CROC_1/AE.SQUARROSA(224)//OPATA, FRAME, STYLET and PASTOR were used against H. latipons in the experiment. Among the 64 genotypes; 20 were resistant, 32 were moderately resistant and 12 were moderately susceptible to the nematode. Ten resistant, 20 moderately resistant and 8 moderately susceptible lines were determined against H. latipons that these 38 lines carried the Cre1 gene in their genome. With in this study, the resistant gene, Cre1, was not found to be completely resistant against H. latipons, but its 78% efficiency rate was found to be successful: therefore, it was concluded that it can be used against H. latipons in national wheat breeding programs. Furthermore, PASTOR, SOKOLL and CROC_1/AE.SQUARROSA(224)//OPATA wheat genotypes were determined as good resistance source against H. latipons. © Ankara Üniversitesi Ziraat Fakültesi.Öğe Morphometric and genetic variability among mediterranean cereal cyst nematode (Heterodera latipons) populations in turkey(Turkiye Klinikleri Journal of Medical Sciences, 2018) İmren M.; Yildiz Ş.; 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 wheat-producing areas of Turkey. © 2018, Turkiye Klinikleri Journal of Medical Sciences. All rights reserved.Öğe Resistance to cereal cyst nematodes in wheat and barley: An emphasis on classical and modern approaches(MDPI AG, 2019) Ali M.A.; Shahzadi M.; Zahoor A.; Dababat A.A.; Toktay H.; Bakhsh A.; Li H.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. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
