Aziz Karakaya
Ankara University, Plant Protection, Faculty Member
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Research Interests: Plant Biology, Biology, Proteomics, Virulence, Plant Physiology, and 4 morePathogen, Trypsin, Cell Wall, and Proteome
Arpa (Hordeum vulgare L.), ulkemizde bugdaydan sonra en yaygin tahil urunudur. Etmeni Pyrenophora teres olan arpa ag benek hastaligi, dunya capinda onemli bir fungal arpa yaprak hastaligidir. Arpa ag benek hastaligina ait izolatlarin... more
Arpa (Hordeum vulgare L.), ulkemizde bugdaydan sonra en yaygin tahil urunudur. Etmeni Pyrenophora teres olan arpa ag benek hastaligi, dunya capinda onemli bir fungal arpa yaprak hastaligidir. Arpa ag benek hastaligina ait izolatlarin toplanmasi amaci ile arpa uretiminin yogun oldugu Ankara, Eskisehir, Konya, Kirikkale, Sivas, Kayseri, Cankiri, Kastamonu, Edirne, Kirsehir, Yozgat, Nevsehir, Bilecik, Aksaray, Icel, Adana, Nigde, Şanliurfa, Mardin, Diyarbakir, Adiyaman, Kahramanmaras, Usak, Manisa, Izmir, Aydin, Denizli, Şirnak, Siirt, Batman, Gaziantep, Hatay, Kilis ve Osmaniye illerini kapsayacak sekilde arazi calismalari ve orneklemeler yapilmistir. Arazi calismalari sonucu 425 adet tek spor izolati elde edilmistir. Turkiye’ de arpa ag benek hastaliginin patotiplerinin belirlenmesi amaci ile 50 adet Pyrenophora teres f. maculata ve 40 adet Pyrenophora teres f. teres izolati secilmis ve 25 adet arpa ayirici test genotipi iceren set uzerinde denenmistir. 50 adet Pyrenophora teres f. m...
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Surveys carried out in Rize province, Turkey, revealed that greenhouse thrips Heliothrips haemorrhoidalis (Bouché) was common and harmful on kiwifruit. Brief information is provided about its identification, biology, distribution and hosts.
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Turnip (Brassica rapa) was evaluated for its growth and adaptability to Wyoming . Forage yields ranged from 3.64 to 7.73 Mg/ha at two locations over a two year period. It is concluded that turnip could be grown as a forage crop in Wyoming .
Research Interests: Biology and Brassica rapa
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Net blotch foliar diseases of barley are important in Turkey, lowering grain yields and quality. There are two forms, the spot form (caused by Pyrenophora teres f. maculata ( Ptm )) and the net form (caused by P. teres f. teres ( Ptt )) .... more
Net blotch foliar diseases of barley are important in Turkey, lowering grain yields and quality. There are two forms, the spot form (caused by Pyrenophora teres f. maculata ( Ptm )) and the net form (caused by P. teres f. teres ( Ptt )) . To determine the pathotypes of Ptt and Ptm in Turkey, surveys were carried out during 2012, 2013 and 2015. Pyrenophora teres samples were collected from 34 provinces of Turkey. From these samples, 258 Ptm and 167 Ptt single conidium isolates were obtained. Pathotypes of 50 P. teres f. maculata and 40 P. teres f. teres isolates were assessed by inoculating onto a differential set of 25 barley genotypes. Twenty six Ptm pathotypes and 24 Ptt pathotypes were identified, and significant pathogenic variation was found among the isolates. Barley breeding programmes in Turkey should consider the pathotypes identified for incorporation of net blotch resistance. Continuous virulence monitoring for the P. teres population should be carried out to inform resis...
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Unimproved landraces and wild relatives of crops are sources of genetic diversity that were lost post domestication in modern breeding programs. To tap into this rich resource, genome-wide association studies in large plant genomes have... more
Unimproved landraces and wild relatives of crops are sources of genetic diversity that were lost post domestication in modern breeding programs. To tap into this rich resource, genome-wide association studies in large plant genomes have enabled the rapid genetic characterization of desired traits from natural landrace and wild populations. Wild barley (Hordeum spontaneum), the progenitor of domesticated barley (Hordeum vulgare), is dispersed across Asia and North Africa, and has co-evolved with the ascomycetous fungal pathogens Pyrenophora teres f. teres and P. teres f. maculata, the causal agents of the diseases net form of net blotch and spot form of net blotch, respectively. Thus, these wild and local adapted barley landraces from the region of origin of both the host and pathogen represent a diverse gene pool to identify new sources of resistance, due to millions of years of co-evolution. The barley—P. teres pathosystem is governed by complex genetic interactions with dominant, ...
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Cephalosporium gramineum ’un neden oldugu Cephalosporium cizgi hastaligi toprak kaynakli olup kislik bugdayin vaskuler bir solgunluk hastaligidir. Hymenula cerealis hastaligin saprofit asamasi olarak kabul edilmistir. Ayni alandaki... more
Cephalosporium gramineum ’un neden oldugu Cephalosporium cizgi hastaligi toprak kaynakli olup kislik bugdayin vaskuler bir solgunluk hastaligidir. Hymenula cerealis hastaligin saprofit asamasi olarak kabul edilmistir. Ayni alandaki hastalikli bitkilerin orani %100 olabilmekte ve urun kayiplari %80’e kadar cikabilmektedir. Hastalik yagisin yuksek oldugu yerlerde yaygin olarak gorulurken daha iliman, daha kurak ya da drenajin daha iyi oldugu topraklarda nadiren gorulmekte veya hic gorulmemektedir. Ilk enfeksiyonlar sonbaharda baslamakta olup inokulum bol oldugu zaman kis boyunca devam etmektedir. Konidilerin ksilem sivisindan yukari dogru hareketi suresince patojen konukcusunu sistemik olarak istila etmektedir. Yaprak tabanindan yaprak ucuna kadar uzanan kenarlari duzensiz beyazimsi seritler hastaligin tipik belirtisidir. Bunun disinda bodurlasma ve ak basak olusumu diger onemli belirtileridir. Bu derlemede ulkemizde 2010 yilinda tespit edilmis olan Cephalosporium cizgi hastaligi etme...
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Pyrenophora teres f. maculata incites spot form of barley net blotch disease. For determination of Pyrenophora teres f. maculata pathotypes, a differential set consisted of 22 international cultivars and genotypes and a susceptible... more
Pyrenophora teres f. maculata incites spot form of barley net blotch disease. For determination of Pyrenophora teres f. maculata pathotypes, a differential set consisted of 22 international cultivars and genotypes and a susceptible Turkish barley variety Bülbül 89 were tested using 45 isolates obtained from different regions of Turkey. Nineteen pathotypes were determined out of 45 isolates used. It appears that this differential set could be useful for determination of P. teres f. maculata pathotypes.
Tomato is among the most produced and exported products in greenhouse cultivation in Turkey. Tomato leaf mold is one of the most important fungal diseases that can cause significant yield losses in greenhouse and hydroponic tomato... more
Tomato is among the most produced and exported products in greenhouse cultivation in Turkey. Tomato leaf mold is one of the most important fungal diseases that can cause significant yield losses in greenhouse and hydroponic tomato cultivation. In this study, the mating types of 97 Fulvia fulva isolates obtained from different provinces in Turkey were determined. We found that 43 isolates were MAT1-1 type and 54 isolates were MAT1-2 type. Both mating types of the pathogen were determined in the same greenhouse. The distribution of mating types conformed to the ratio of 1:1. This showed the high probability of sexual reproduction of Turkish F. fulva populations. In addition, a multiplex PCR method was developed for the rapid detection of pathogen mating types. In multiplex PCR results, except for the main amplified fragment, 806 and 613 bps were obtained in MAT1-1 type, while fragment with a length of 613 bp was obtained in MAT1-2 type. It is thought that the mating types of the pathogen can be determined by using these DNA regions showing homology in multiplex PCR since the fragment sizes obtained with mating type primers are very close to each other. The reliability of the method was supported by the band profiles obtained by cutting PCR products with the PstI enzyme. This will be helpful in mating-type studies of F. fulva .
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Tomato is among the most produced and exported products in greenhouse cultivation in Turkey. Tomato leaf mold is one of the most important fungal diseases that can cause significant yield losses in greenhouse and hydroponic tomato... more
Tomato is among the most produced and exported products in greenhouse cultivation in Turkey. Tomato leaf mold is one of the most important fungal diseases that can cause significant yield losses in greenhouse and hydroponic tomato cultivation. In this study, the mating types of 97 Fulvia fulva isolates obtained from different provinces in Turkey were determined. We found that 43 isolates were MAT1-1 type and 54 isolates were MAT1-2 type. Both mating types of the pathogen were determined in the same greenhouse. The distribution of mating types conformed to the ratio of 1:1. This showed the high probability of sexual reproduction of Turkish F. fulva populations. In addition, a multiplex PCR method was developed for the rapid detection of pathogen mating types. In multiplex PCR results, except for the main amplified fragment, 806 and 613 bps were obtained in MAT1-1 type, while fragment with a length of 613 bp was obtained in MAT1-2 type. It is thought that the mating types of the pathogen can be determined by using these DNA regions showing homology in multiplex PCR since the fragment sizes obtained with mating type primers are very close to each other. The reliability of the method was supported by the band profiles obtained by cutting PCR products with the PstI enzyme. This will be helpful in mating-type studies of F. fulva .
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Pyrenophora teres is an important pathogen of barley. The pathogen has two biotypes: Pyrenophora teres f. teres , which causes the net type of net blotch, and P. teres f. maculata causing the spot type of net blotch. Turkey is an... more
Pyrenophora teres is an important pathogen of barley. The pathogen has two biotypes: Pyrenophora teres f. teres , which causes the net type of net blotch, and P. teres f. maculata causing the spot type of net blotch. Turkey is an important gene centre of barley and has a rich barley landrace population. Finding disease resistant barley germplasm has potential for world agriculture. Three virulent Pyrenophora teres f. maculata ( Ptm ) isolates and three virulent Pyrenophora teres f. teres ( Ptt ) isolates were tested for their pathogenicity to 198 barley landraces, and landraces resistant to both forms of the pathogen were identified. Thirteen landraces (numbered 17, 40, 71, 98, 101, 103, 104, 143, 162, 167, 171, 183 and 185) were resistant to the Ptm isolates and seven (numbered 18, 21, 22, 24, 40, 71 and 153) were resistant to the Ptt isolates. Two landraces (40 and 71) were resistant to all six P. teres isolates. In addition, several of the landraces exhibited reactions to one or ...
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Pyrenophora teres’ in neden oldugu ag benek hastaligi dunyada oldugu gibi ulkemizde de arpa hastaliklari arasinda kaliteyi ve verimi etkileyen onemli bir hastaliktir. Hastaliga sebep olan patojenin iki tipi bulunmaktadir. Pyrenophora... more
Pyrenophora teres’ in neden oldugu ag benek hastaligi dunyada oldugu gibi ulkemizde de arpa hastaliklari arasinda kaliteyi ve verimi etkileyen onemli bir hastaliktir. Hastaliga sebep olan patojenin iki tipi bulunmaktadir. Pyrenophora teres Drechs. f. teres Smedeg. ag tipi belirtilere, P.teres . f. maculata Smedeg. nokta tipi belirtilere neden olmaktadir. Funguslarda, cesitli yollar ile virulens degisiklikleri ortaya cikabilmekte ve dayanikli olarak belirlenen genotipler bu degisiklikler sonucu ortaya cikan yeni virulent patotiplere karsi zamanla hassas reaksiyon verebilmektedir. Yetistirilmekte olan arpa cesitlerinin dayaniklilik durumlari virulent patotiplerce etkilenebilir. Basarili bir yetistirme programi icin cesitlerin tepkilerinin belirlenmesi, olasi dayanikli genotiplerin tespit edilmesi ve ag benek patojeninin virulens degiskenliginin bilinmesi onem kazanmaktadir. Bu calismada P. teres f. teres ve P. teres f. maculata etmenlerinin virulensliginin degisik bolgelerdeki farklil...
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ABSTRACT [Species identification of 2 Phytophthora isolates from roots of kale (Brassica oleracea) and tyfon (hybrid of turnip and Chinese cabbage) are described. Morphological and pathological characteristics as well as cardinal temp.... more
ABSTRACT [Species identification of 2 Phytophthora isolates from roots of kale (Brassica oleracea) and tyfon (hybrid of turnip and Chinese cabbage) are described. Morphological and pathological characteristics as well as cardinal temp. for mycelial growth of these isolates were compared with Australian and Great Britain isolates of P. megasperma from Brassica spp., Wyoming isolates of P. megasperma f.sp. medicaginis from lucerne and P. cryptogea from sugarbeet.
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Rize ilinde yapilan incelemeler sonucu, kivide yaygin ve zararli oldugu belirlenen sera thripsi Heliothrips haemorrhoidalis (Bouche)’in taninmasi, kisa biyolojisi, yayilisi ve konukculari hakkinda bilgi verilmistir
Research Interests: Biology and Agricultural
Seedling stage reactions of 25 barley cultivars were evaluated against three isolates of Drechslera teres f. teres causing net form of net blotch of barley under greenhouse conditions. Isolates were obtained from Eskisehir, Diyarbakir,... more
Seedling stage reactions of 25 barley cultivars were evaluated against three isolates of Drechslera teres f. teres causing net form of net blotch of barley under greenhouse conditions. Isolates were obtained from Eskisehir, Diyarbakir, and Sivas provinces of Turkey. The reactions of cultivars to fungal isolates ranged between resistant-moderately resistant and moderately susceptible-susceptible. Cultivars Bulbul 89 and Ince 04 were found as the most susceptible cultivars, which were followed by cvs. Cildir 02, Ozdemir 05 and Hamidiye 85. Cultivar Harman was found as the most resistant cultivar. This cultivar was followed by cvs Lord, Yercil 147, Erginel 90, Bilgi 91, Unver, and Aydan Hanim. Virulence differences among the isolates were observed. Diyarbakir isolate was the least virulent isolate whereas Sivas isolate was the most virulent isolate.
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In this study, carried out in 2008 in Rize Province which is an important kiwifruit area of Turkey, was determined Hemiberlesia rapax (Comstock) , Ceroplastes sinensis Del Guercio, Coccus hesperidum L. and Pseudaulacaspis pentagona... more
In this study, carried out in 2008 in Rize Province which is an important kiwifruit area of Turkey, was determined Hemiberlesia rapax (Comstock) , Ceroplastes sinensis Del Guercio, Coccus hesperidum L. and Pseudaulacaspis pentagona Targioni Tozzeti. H. rapax and P. pentagona were found common species. It is estimated that these tw o insects will be potential pests for kiwifruit. Th is is the first report of these scale insects on kiwif ruit in Turkey. Brief information was provided about the biology, distribution and general characteristi cs of these insects.
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Abstract: Seedling reactions of 15 barley cultivars grown in Turkey were determined under greenhouse conditions to five isolates of Drechslera graminea, the causal agent of barley stripe disease. Isolates were collected from different... more
Abstract: Seedling reactions of 15 barley cultivars grown in Turkey were determined under greenhouse conditions to five isolates of Drechslera graminea, the causal agent of barley stripe disease. Isolates were collected from different parts of Ankara province. Differences were observed among the reactions of the cultivars to the isolates of the fungus. There were also pathogenicity differences among the isolates. The cultivars Çumra 2001 and Yerçil 147 were resistant to all five isolates. Cultivar Sladoran was resistant to 4 isolates. The cultivars Erginel 90, Orza 96, Çetin 2000 and Aydanhanım were susceptible to three isolates of the fungus. The reactions of other varieties ranged between resistant and susceptible depending on the isolates. Isolate Dg3 was the most virulent.
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Seedling reactions of 20 barley cultivars grown in Turkey to an isolate of Drechslera teres f. maculata was determined under controlled conditions. The reactions of cultivars ranged between susceptible to resistant-moderately resistant.... more
Seedling reactions of 20 barley cultivars grown in Turkey to an isolate of Drechslera teres f. maculata was determined under controlled conditions. The reactions of cultivars ranged between susceptible to resistant-moderately resistant. Cultivars Tokak 157/37 and Bulbul 89 was susceptible to the isolate used. The cultivars Ozdemir, Cildir 02 and Cumhuriyet 50 showed a moderately susceptible- susceptible reaction. The cultivars Fahrettinbey, Bilgi 91, Suleymenbey 98 and Bornova 92 were moderately susceptible to the isolate. The cultivars Yercil 147, Şerifehanim 98, Sur 93, Ince 04, Konevi, Balkan 96, Beysehir and Zeynelaga were moderately resistant - moderately susceptible to the pathogen. The cultivars Sladoran and Kiral 97 showed a moderately resistant and cultivar Erginel 90 showed a resistant-moderately resistant reaction the isolate. Seedling reactions of 20 barley cultivars grown in Turkey to an isolate of Drechslera teres f. maculata was determined under controlled conditi...
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Wheat is a commonly grown crop in Turkey. Rust diseases are among the most important biotic factors affecting wheat yield and quality. Stem rust of wheat caused by Puccinia graminis f. sp. tritici is one of the oldest known diseases of... more
Wheat is a commonly grown crop in Turkey. Rust diseases are among the most important biotic factors affecting wheat yield and quality. Stem rust of wheat caused by Puccinia graminis f. sp. tritici is one of the oldest known diseases of wheat. Wheat stem rust is common in Kastamonu province located in the northern part of Turkey. In addition, Berberis species are also common in Kastamonu province. In this study which was conducted in 2016 and 2017 in Kastamonu province, stem rust races occurring on Berberis species and wheat plants were determined. Forty single pustule aeciospores from Berberis plants were obtained. The most common stem rust race originating from Berberis plants was TTTTF. Other stem rust races from Berberis plants were RTTTF, RTTTC, TTTTC, and TTKTF. From wheat, 74 single pustule isolates of stem rust were obtained. The most common stem rust race originating from wheat was also TTTTF. Other stem rust races from wheat plants were TTKTF, TTTTC, TTKTC, RTTTF, and RTTTC.
Research Interests: Microbiology and Biology
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The seedling reactions of three barley cultivars, one hulless barley cultivar, two candidate hulless barley lines and nine hulless barley genotypes were determined under greenhouse conditions to ten isolates of Drechslera teres f.... more
The seedling reactions of three barley cultivars, one hulless barley cultivar, two candidate hulless barley lines and nine hulless barley genotypes were determined under greenhouse conditions to ten isolates of Drechslera teres f. maculata , the causal agent of spot form of net blotch. Isolates were obtained from Ankara, Cankiri, Eskisehir, Kayseri, Konya and Şanliurfa provinces. The reactions of the cultivars and hulless cultivar ranged between suscepible-resistant. The reactions of the hulless candidate lines and genotypes ranged between resistant-moderately resistant-moderately susceptible with the exception of Candidate line 8 which showed a moderately susceptible reaction to the 3 isolates. There were differences among the reactions of the cultivars and genotypes to the isolates of the fungus. Isolates showed some differences in pathogenicity for each cultivar. Generally, resistance was found among the hulless barley cultivars and genotypes to Drechslera teres f. maculata . Tom...
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Barley ( Hordeum vulgare ) is an important crop in Turkey. In this study, 37 barley fields in Batman central district and Besiri (Batman), Gercus (Batman), Hasankeyf (Batman), Kozluk (Batman), Sason (Batman), Kocakoy (Diyarbakir),... more
Barley ( Hordeum vulgare ) is an important crop in Turkey. In this study, 37 barley fields in Batman central district and Besiri (Batman), Gercus (Batman), Hasankeyf (Batman), Kozluk (Batman), Sason (Batman), Kocakoy (Diyarbakir), Kurtalan (Siirt), and Midyat (Mardin) districts were examined for the presence of leaf diseases. In addition, 24 naturally grown wild barley ( H. spontaneum ) populations in Batman central district and Besiri, Hasankeyf, Kurtalan and Midyat districts were inspected for the presence of leaf diseases. In barley fields, scald caused by the Rhynchosporium commune was the most common diseases followed by spot form of net blotch caused by Drechslera teres f. maculata , barley stripe caused by Drechslera graminea , net form of net blotch caused by Drechslera teres f. teres , spot blotch caused by Cochliobolus sativus , powdery mildew caused by Blumeria graminis f. sp. hordei and brown rust caused by Puccinia hordei . Among the Hordeum spontaneum populations the ...
Leaf diseases occurring on barley fields in Bala district of Ankara province, Turkey were determined. Survey studies were carried out in Bala district in 2018 and prevalence and severity of these diseases were determined. A total of 50... more
Leaf diseases occurring on barley fields in Bala district of Ankara province, Turkey were determined. Survey studies were carried out in Bala district in 2018 and prevalence and severity of these diseases were determined. A total of 50 fields were examined. The following barley disease causing agents were found: Drechslera teres f. maculata, Drechslera teres f. teres, Drechslera graminea, Rhynchosporium secalis and Erysiphe graminis f. sp. hordei. Mean prevalences of these diseases were determined as Drechslera teres f. teres 30.7%, Drechslera teres f. maculata 11.7%, Drechslera graminea 1.16%, Rhynchosporium secalis 4.67% and Erysiphe graminis f. sp. Hordei 0.2%. Drechslera teres f. teres and Drechslera teres f. maculata were found as the most common disease agents. Disease severity values ranged between 4-8 using a 1-9 scale.
Barley stripe disease caused by Drechslera graminea is an important disease of barley worldwide. During 2012, 205 barley fields were surveyed for the presence of this disease in Central Anatolia, Turkey. Eighty-two fields (40%) were found... more
Barley stripe disease caused by Drechslera graminea is an important disease of barley worldwide. During 2012, 205 barley fields were surveyed for the presence of this disease in Central Anatolia, Turkey. Eighty-two fields (40%) were found to be infected with Drechslera graminea . Disease incidence ranged between 1-70%. Generally low amount of disease was observed, however, disease incidence was high (up to 70%) in some fields of Kayseri, Sivas, Yozgat and Aksaray provinces. Large differences were observed among provinces for the proportion of crops infected.
210 aspir genotipinin aspir pasi hastaligina karsi tepkileri tarla kosullarinda belirlenmistir. Genotipler 0–5 iskalasina gore degerlendirilmislerdir. 30 genotip Dayanikli, 26 genotip Orta Derecede Dayanikli, 27 genotip Orta Derecede... more
210 aspir genotipinin aspir pasi hastaligina karsi tepkileri tarla kosullarinda belirlenmistir. Genotipler 0–5 iskalasina gore degerlendirilmislerdir. 30 genotip Dayanikli, 26 genotip Orta Derecede Dayanikli, 27 genotip Orta Derecede Hassas, 127 genotip ise Hassas olarak bulunmustur.
Powdery mildew, net blotch, scald, spot blotch, barley stripe, and leaf rust are important foliar fungal pathogens of barley. Fungal leaf pathogens negatively affect the yield and quality in barley plant. Virulence changes, which can... more
Powdery mildew, net blotch, scald, spot blotch, barley stripe, and leaf rust are important foliar fungal pathogens of barley. Fungal leaf pathogens negatively affect the yield and quality in barley plant. Virulence changes, which can occur in various ways, may render resistant plants to susceptible ones. Factors such as mutation, population size and random genetic drift, gene and genotype flow, reproduction and mating systems, selection imposed by major gene resistance, and quantitative resistance can affect the genetic diversity of the pathogenic fungi. The use of fungicide or disease-resistant barley genotypes is an effective method of disease control. However, the evolutionary potential of pathogens poses a risk to overcome resistance genes in the plant and to neutralize fungicide applications. Factors affecting the genetic diversity of the pathogen fungus may lead to the emergence of more virulent new pathotypes in the population. Understanding the factors affecting pathogen evo...
Yem bitkisi olarak kullanilan uc Brassica turu Kayalik Daglar bolgesinde (ABD) yetismeleri, sartlara ve cevreye uyma yetenekleri yonunden incelenmistir. Brassica turleri onceden Brassica oleracea var. acephala ‘kale’ uzerinde gozlemlenen... more
Yem bitkisi olarak kullanilan uc Brassica turu Kayalik Daglar bolgesinde (ABD) yetismeleri, sartlara ve cevreye uyma yetenekleri yonunden incelenmistir. Brassica turleri onceden Brassica oleracea var. acephala ‘kale’ uzerinde gozlemlenen bir Phytophthora hastaligi ile enfekteli tarlalarda yetistirilmistir. Metalaxyl muamelesinin Brassica mahsul miktarini onemli bir olcude etkilemedigi gorulmustur. Zararli problemlerinin olmasina ragmen Brassica turleri dusuk isi derecelerine tolerans gostermisler ve 9.90 Mg/ha a kadar urun alinmistir. Brassica turlerinden izole edilen Phytophthora izolatlari Phytophthora megasperma olarak teshis edilmistir. Bu izolatlar konukcuya ozellesmis olarak gozuken yonca izolati Phytophthora megasperma f.sp. medicaginis izolatindan farkliliklar gostermistir.