Cimmyt International Maize And Wheat Improvement Center Pk

Ankara, Turkey

Cimmyt International Maize And Wheat Improvement Center Pk

Ankara, Turkey
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Toktay H.,Biological Control Research Station | Yavuzaslanoglu E.,Karamanoglu Mehmetbey University | Imren M.,Biological Control Research Station | Nicol J.,Cimmyt International Maize And Wheat Improvement Center Pk | And 2 more authors.
Turkiye Entomoloji Dergisi | Year: 2012

Breeding for resistance to the cereal cyst nematodes (CCN) Heterodera filipjevi (Madzhidov,) Stelter, and H. avenae (Wollenweber) and to the root lesion nematode (RLN) Pratylenchus thornei (Sher &Allen) is presently being undertaken by breeding programs at research institutions in Turkey. This study was carried out to screen for nematode resistance in an advanced spring bread wheat breeding population, 42 lines (F9) developed at CIMMYT in Mexico, by crossing resistant parent the Middle-Eastern landrace AUS4930 7.2 and susceptible parent, the widely adapted, high yielding CIMMYT line, Pastor. The results demonstrate that 31 lines are resistant to P. thornei and 5 lines are resistant to H. filipjevi. Only 4 of these lines (2, 7, 23 and 41) are resistant to both nematodes. Lines 2, 7 and 41 also contain the known resistance gene, Cre1. Although some lines carry the Cre1 gene, they are susceptible to either both or one of these nematodes. There is no association among H. filipjevi, P. thornei and Cre1 resistance due to differences in the resistance region in the plant genome.


Toktay H.,Biological Control Research Station | Imren M.,Biological Control Research Station | Nicol J.M.,Cimmyt International Maize And Wheat Improvement Center Pk | Dababat A.,Cimmyt International Maize And Wheat Improvement Center Pk | Elekcioglu I.H.,Cukurova University
Turkiye Entomoloji Dergisi | Year: 2012

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 medium (70:29:1 sand, field soil and organic matter), small container (15 mm diameter × 100 mm in long), inoculation density with 400 individuals per plant, 9 week growing period and bottom perlite irrigation system.


Imren M.,Biological Control Research Station | Waeyenberge L.,Burg. Van Gansberghelaan 96 | Viaene N.,Burg. Van Gansberghelaan 96 | Toktay H.,Biological Control Research Station | And 2 more authors.
Turkiye Entomoloji Dergisi | Year: 2012

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 of cereals cultivated in different parts of Turkey. In this study, forty seven cereal cyst nematode isolates collected from cereal growing areas of the South Anatolian Region of Turkey (Hatay, Kahramanmara, Gaziantep, Kilis, Mardin and Adýyaman), were identified by 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. 76,5 % of the isolates were characterized as H. latipons, 13 % H. filipjevi, 8,5 % H. avenae and 2 % H. ciceri.


Imren M.,Biyolojik Mucadele Arastirma Istasyon Mudurlugu P.K. | Toktay H.,Biyolojik Mucadele Arastirma Istasyon Mudurlugu P.K. | Ozarslandan A.,Biyolojik Mucadele Arastirma Istasyon Mudurlugu P.K. | Nicol J.M.,Cimmyt International Maize And Wheat Improvement Center Pk | Elekciolu I.H.,C.U. Ziraat Fakultesi
Turkiye Entomoloji Dergisi | Year: 2012

The Heterodere avenae group includes 12 species that affect roots of cereals and three species [H. avenae (Wollenweber, 1924), H. filipjevi [(Madzhidov, 1981) Stelter 1984)], H. latipons (Franklin 1969)] are among the most economically important cyst nematodes pest to cultivated cereals in different part of Turkey. In this study, morphological and molecular characterization of 14 cereal cyst populations collected in cereal fields of Southeast Anatolia (Gaziantep, Hatay, Kahramanmaraş, Kilis and Mardin) of Turkey were identified. Morphological characters and morphometric measurements of the cysts and second stage juveniles of the isolated populations were studied. Molecular characterization of cereal cyst nematode species showed distinct restriction fragment patterns of the ITSrDNA following PCR amplification and RFLP digestion with two endonucleases (Alu I, Pst I). Our results revealed that Hatay populations were identified as H. avenae type A, Gaziantep and Kilis populations as H. latipons, Kahramanmaraş populations as H. filipjevi and Mardin populations as H. avenae type A, H. avenae type B and H. latipons.


Imren M.,Cimmyt International Maize And Wheat Improvement Center Pk | Toktay H.,Cimmyt International Maize And Wheat Improvement Center Pk | Ozarslandan A.,Cimmyt International Maize And Wheat Improvement Center Pk | Dababat A.,Cukurova University | Elekcioglu I.H.,Cimmyt International Maize And Wheat Improvement Center Pk
Turkiye Entomoloji Dergisi | Year: 2012

In this study, the effect of temperatures on the incubation duration of the cereal cyst nematode cysts, Heterodera avenae Wollenweber and determining of the optimum methods and materials was investigated under invitro conditions. The effect of tempratures on incubation duration of Heterodera avenae cysts was studied on two different incubation stages. First incubation exposured to all cysts was set up 66 days at 4°C after each samples transfered different temperatures (5, 10, 15, 20 and 25°C). The cumulative hatching percent was significantly effected by different temperatures at the end of 252 days. Hatching was greater at lower temperatures (5, 10 15 °C) compared to at higher temperatures of (20, 25°C) ranging between 46.7, 82.3 and 45.9 % vs and 30.7 and 19.0%, respectively. Although the highest cumulative hatching of 82.3% was obtained at a constant 10°C at 252 days, the lowest cumulative hatching of 19.0% was obtained to 25°C at 252 days. The most suitable soil type for the in-vitro conditions was found the sandy soil (70 % sand: 29% field soil: 1% organic matter), best inoculation rate was 2,5 second stage juveniles per gram soil and inoculation time at planting day.

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