Aziz Karakaya

Aziz Karakaya
Ankara University · Department of Plant Protection

Ph. D.

About

159
Publications
30,127
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733
Citations
Citations since 2016
86 Research Items
532 Citations
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2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
Introduction
Aziz Karakaya currently works at the Department of Plant Protection, Ankara University, Turkey. Aziz does research in Plant Pathology. His current study areas are barley and wheat diseases, wild barleys, disease resistance, tea, kiwifruit and blueberry diseases.

Publications

Publications (159)
Article
Full-text available
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. Pyrenopho...
Article
Full-text available
Pyrenophora teres f. maculata (Ptm) and Pyrenophora teres f. teres (Ptt) incite net and spot forms of net blotch disease of barley, respectively. In this study, Ptm and Ptt isolates differing in virulence were compared in terms of protease activity and glucose production. Protease production by Ptm isolates ranged between 75.33 ± 4.10 and 127.33 ±...
Article
Full-text available
Barley scald, caused by the fungal pathogen Rhynchosporium commune is the most important disease of barley in the world and in Turkey. Surveys were conducted during 2012, 2013, and 2014 in different regions of Turkey. Isolations were accomplished from diseased leaves and from these fifty-two R. commune single spore isolates were selected. A total o...
Article
Rhynchosporium commune is the causal agent of barley scald disease and is an important foliar disease of barley worldwide. During 2012, 2013, and 2014, Rhynchosporium commune single-spore isolates were collected from different parts of Turkey, and from those, 60 isolates were selected. The mating type distribution and prevalence of these selected i...
Preprint
Full-text available
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 bar...
Article
Pyrenophora teres f. maculata (Ptm) is a fungal pathogen that causes the spot form of net blotch on barley and leads to economic losses in many of the world's barley-growing regions. Isolates of Ptm exhibit varying levels of aggressiveness that result in quantifiable changes in the severity of the disease. Previous research on plant-pathogen intera...
Conference Paper
Full-text available
In June 2022, surveys were carried out in Afyonkarahisar and Konya provinces of Türkiye in order to determine the distribution of downy mildew disease in the opium poppy fields. Fifty-one and 68 opium poppy fields, respectively in Afyonkarahisar and Konya provinces were examined. Downy mildew was detected in 34 fields (% 66.67) in Afyonkarahisar an...
Conference Paper
Full-text available
Under greenhouse conditions, seedling reactions of 36 barley cultivars and 35 barley genotypes to spot blotch disease caused by Cochliobolus sativus were determined. Four genotypes showed low infection responses, on the other hand, 26 and 5 genotypes showed intermediate and high infection responses. Barley cultivars Pınar and Harman exhibited low i...
Poster
Full-text available
In 2021 and 2022, the presence of Berberis plants in the Çankırı province of Turkey and their aecia infection status were investigated. In 2021, 45 Berberis plants in Şabanözü, Orta, Atkaracalar, Kurşunlu and Korgun districts, and in 2022, 73 Berberis plants in Eldivan, Yapraklı, Ilgaz, Şabanözü districts and Çankırı central district were examined....
Article
Full-text available
Fusarium pseudograminearum is one of the most damaging Fusarium species that causes root, crown, and foot rots in wheat. Identification of resistant germplasm is one of the most efficient and environmentally sound control methods. However, up to date, limited wheat genotypes with partial resistance are available. Therefore, in this study, the seedl...
Article
Septoria Leaf Blotch caused by Zymoseptoria tritici is a major disease of wheat affecting many wheat‐growing regions in the world. This study is the first to describe characteristics of the pathotype structure of Z. tritici isolates in Central Anatolia, Turkey, and to determine effective resistance genes for use in breeding strategies of Septoria L...
Article
Full-text available
Ramularia collo-cygni, arpada (Hordeum vulgare) Ramularia yaprak lekesi hastalığına neden olan fungal bir etmendir. Nekrotik lekelenmeye ve erken yaprak yaşlanmasına neden olarak arpada yeşil yaprak alanı kaybına yol açmakta ve epidemi yapması durumunda %70'e varan verim kaybına neden olmaktadır. Hastalığın geç dönemde ortaya çıkması ve etmenin tan...
Article
Full-text available
Seedling stage reactions of thirty-eight 2-rowed barley landraces representing different areas of Turkey obtained from Osman Tosun Gene Bank to two Pyrenophora teres f. teres isolates were evaluated. In addition, barley cultivars Bülbül 89 and Avcı 2002 were included. Landraces exhibited different reactions to the disease and their reactions ranged...
Article
Full-text available
Pyrenophora tritici-repentis, (eşeysiz dönemi: Drechslera tritici-repentis) tüm dünyada buğdayda sarı yaprak lekesi hastalığına neden olan önemli bir fungal patojendir. Pyrenophora tritici-repentis Ascomycota funguslarının en büyük ve çeşitli sınıfı olan Dothideomycetes sınıfında yer alır. Fungus, konidiler ile eşeysiz, askosporlar ile eşeyli çoğal...
Preprint
Full-text available
Rhynchosporium commune, the causal agent of the disease scald or leaf blotch of barley is a hemibiotrophic fungal pathogen of global importance, responsible for yield losses ranging from 30-40% on susceptible varieties. To date, over 150 resistance loci have been characterized in barley. However, due to the suspected location of the R. commune host...
Article
Full-text available
Puccinia carthami'nin neden olduğu aspir pas hastalığı, aspir bitkisinin en önemli fungal hastalıklarından birisidir. Bu çalışmada, 2019 yılında aspir bitkisinin tam çiçeklenme döneminde Edirne ilinde doğal şartlar altında 219 genotipin (159 linoleik ve 60 oleik tip) aspir pas hastalığına karşı dayanıklılığı belirlenmiştir. Hastalık reaksiyonu 0-5...
Article
Full-text available
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 we...
Article
Full-text available
In this review, the prevalence of rice blight disease (Pyricularia oryzae), which is the most important fungal disease of rice in the rice-growing areas of Turkey, reaction studies against rice blight disease and resistance and control studies against this disease have been reported. Monitoring the prevalence of P. oryzae and conducting resistance...
Article
Barley net blotch is one of the most widespread and destructive foliar diseases of barley crops worldwide. The causal fungal agent, Pyrenophora teres (anamorphic stage: Drechslera teres) occurs in two forms, P. teres f. maculata (Ptm) and P. teres f. teres (Ptt) exhibiting the spot and net type symptoms, respectively. In this study, sixty-one P. te...
Poster
Full-text available
In 2016 and 2017, 25 Berberis plants in Sinop province located in northern Turkey were examined for the presence of aecial infection. The elevation of Berberis plants ranged between 334-and 543 m. The estimated number of Berberis plants per 100 m 2 ranged between 1 and 30 and the number of infected plants in 10 m ranged between 1-10. The heights of...
Article
Full-text available
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 bar...
Article
Full-text available
Barley (Hordeum vulgare) is an important crop in Turkey. In this study, 37 barley fields in Batman central district and Beşiri (Batman), Gercüş (Batman), Hasankeyf (Batman), Kozluk (Batman), Sason (Batman), Kocaköy (Diyarbakır), Kurtalan (Siirt), and Midyat (Mardin) districts were examined for the presence of leaf diseases. In addition, 24 naturall...
Article
Full-text available
Stem rust caused by Puccinia graminis f. sp. tritici is an important disease of wheat in the world. This disease is also common in the Sinop province of Turkey. The pathogen forms new races and these races may overcome the resistance present in wheat cultivars. For sustainable wheat production, identification of the stem races is necessary. During...
Article
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, Berber...
Article
Full-text available
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 an...
Article
Full-text available
Seedling resistance of 46 bread wheat and 14 durum wheat cultivars grown commonly in Turkey to stem rust races TTTTF, RTTTC and RTTTF, the most common races in Kastamonu region of Turkey, was determined under greenhouse conditions. Bread wheat cultivars Tahirova 2000, Yıldırım, Alpu 2001, Canik 2003 and Basri Bey 95 were found to be resistant to th...
Article
Full-text available
Tomato leaf mold caused by Passalora fulva is an important disease of tomatoes that grow especially in greenhouse conditions. In 2019, 27 and 29 greenhouses from different areas were inspected for the presence of tomato leaf mold in Bartın and Zonguldak provinces of Turkey. Tomato leaf mold was present in 20 greenhouses in Bartın (74.1%) and 10 gre...
Article
Full-text available
Hordeum bulbosum is one of the wild barley species naturally growing in Bingöl province of Turkey. This wild species is an important gene source for obtaining disease resistant plants. In 2018, a survey was carried out in order to determine the diseases occurring on Hordeum bulbosum plants in Bingöl province. Twenty-seven naturally growing Hordeum...
Article
Full-text available
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 pat...
Article
Full-text available
Wheat diseases are one of the constraints limiting wheat yields wherever the crop is grown. Fusarium crown rot, incited by Fusarium culmorum, is one of the most important diseases limiting wheat yields especially in dryland areas. Although there are no wheat varieties which are fully resistant to crown rot, the use of varieties showing some degree...
Chapter
Five barley fields in Genç, Adaklı and Central district of Bingöl province of Turkey were investigated for the presence of barley diseases in 2018. Spot form of net blotch caused by Drechslera teres f. maculata, net form of net blotch caused by Drechslera teres f. teres, scald caused by Rhynchosporium commune, powdery mildew caused by Erysiphe gram...
Chapter
Rice (Oryza sativa) is one of most important cereal crops in Turkey. More intensive rice production areas in Turkey are located in Thrace region. Rice blast disease caused by the fungus Pyricularia oryzae is one of the most important pathogens that affect the yield and quality of rice plants. In this study, a total of 22 rice fields were surveyed i...
Chapter
Full-text available
Botrytis cinerea is one of the most important fungal diseases that decrease the yield and quality of tomato plants especially under greenhouse conditions where intensive cultivation was carried out. The fungus can infect plants under field, garden, greenhouse and storage conditions. B. cinerea has the ability to infect all aboveground parts of the...
Article
Full-text available
Spot blotch disease incited by Cochliobolus sativus is an important disease of barley (Hordeum vulgare L.) crops worldwide. In this study, seedling reactions of 28 six-rowed barley landraces obtained from Osman Tosun Gene Bank, Turkey, and two Turkish barley cultivars (Avcı 2002 and Bülbül 89) to 2 Cochliobolus sativus isolates obtained from Kastam...
Article
Full-text available
Barley scald is caused by the fungal pathogen Rhynchosporium commune. This disease causes substantial losses in barley production areas of the world. In this study, seedling resistance of 198 barley landraces, 104 wild barley (Hordeum spontaneum) genotypes and two susceptible Turkish cultivars (Bülbül 89 and Efes 3) to 6 R. commune isolates was ass...
Presentation
Full-text available
Botrytis cinerea is one of the most important fungal diseases that decrease the yield and quality of tomato plants especially under greenhouse conditions where intensive cultivation was carried out. The fungus can infect plants under field, garden, greenhouse and storage conditions. B. cinerea has ability to infect all aboveground parts of the plan...
Presentation
Full-text available
Tomato leaf mold disease caused by Cladosporium fulvum (Passalora fulva) is an important disease of tomatoes growing especially in greenhouse conditions. In 2019, 27 and 29 greenhouses were inspected for the presence of tomato leaf mold disease in Bartın and Zonguldak provinces of Turkey, respectively. Tomato leaf mold disease was present in 20 Bar...
Article
Full-text available
2018 yılının Mayıs ve Haziran aylarında Elazığ ilinin merkez ilçe, Karakoçan, Palu, Arıcak, Kovancılar, Keban, Ağın, Baskil, Sivrice ve Maden ilçelerinin arpa yetiştirilen alanlarında sürveyler yapılmış ve arpa bitkilerinde görülen yaprak hastalıkları belirlenmiştir. Arpa bitkilerinde Drechslera teres f. maculata ve Drechslera teres f. teres tarafı...
Conference Paper
Full-text available
Stem rust of wheat caused by Puccinia graminis f. sp. tritici is an important disease of wheat (Triticum spp.) in the world. This disease is also common in Turkey. In 2016, severe stem rust symptoms on bread wheat plants (Triticum aestivum L.) were observed in 2 fields of Gerze district of Sinop province located in northern part of Turkey. Two sing...
Article
Full-text available
Net blotch caused by Pyrenophora teres is an important pathogen of barley plants worldwide. There are two biotypes of the fungus. Pyrenophora teres f. teres (Ptt) causes the net form of the disease and Pyrenophora teres f. maculata (Ptm) causes the spot form of the disease. Barley landraces are good sources of disease resistance. In this study, see...
Article
Full-text available
Wild barley (Hordeum spontaneum) is a progenitor of cultivated barley and naturally grows in Turkey. H. spontaneum genotypes possess superior characteristics for biotic and abiotic stress tolerance factors. In this study, 3 virulent Pyrenophora teres f. maculata and 3 virulent P. teres f. teres isolates were tested under greenhouse conditions in or...
Article
Full-text available
Pyrenophora teres f. maculata (Ptm) (spot form of net blotch) and Pyrenophora teres f. teres (Ptt) (net form of net blotch) are common leaf pathogens that cause net blotch disease of barley. From different regions of Turkey during the years 2012-2016 and 2017, 48 Ptt and 49 Ptm single spore isolates were obtained from different Hordeum species [H....
Article
Full-text available
Kavuzsuz 2 arpa çeşidi, bir kavuzsuz arpa çeşit adayı ve 19 kavuzsuz arpa genotipinin, sera koşullarında, arpada Cochliobolus yaprak lekesi hastalığını oluşturan Cochliobolus sativus’un Yozgat ve Hatay illerinden elde edilen iki izolatına karşı fide dönemi tepkileri değerlendirilmiştir. Kavuzsuz arpa çeşitleri Yalın ve Özen orta enfeksiyon tepkisi...
Article
Full-text available
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, Drechs...
Conference Paper
Full-text available
Wheat (Triticum spp.) is one of the most important crops in the World. Wheat diseases are one of the constraints limiting wheat yields wherever the crop is grown. Fusarium crown rot is one of the most important diseases limiting wheat yields especially in drylands and where monoculture is practiced. Although there are no wheat varieties which are f...
Conference Paper
Crown rot of wheat (Triticum spp.) is one of the constraints limiting dry land wheat production.
Conference Paper
Full-text available
Abstract Wheat (Triticum spp.) is one of the most important crops in the World. Wheat diseases are one of the constraints limiting wheat yields wherever the crop is grown. Fusarium crown rot is one of the most important diseases limiting wheat yields especially in drylands and where monoculture is practiced. Although there are no wheat varieties w...
Article
Full-text available
Pyrenophora teres f. maculata (Ptm) and Pyrenophora teres f. teres (Ptt) causes spot form and net form of net blotch diseases of barley, respectively. Although both forms of P. teres are morphologically similar, their symptoms and genetic background differ. In this study, 175 single spore (109 Ptm and 66 Ptt) isolates obtained from different region...
Article
Full-text available
Some agronomic properties of Iranian barley landraces were evaluated using pot experiments under greenhouse conditions. Different seeds of landraces obtained from different regions of northwest Iran were evaluated for their plant heights, number of tillers and length of the spikes. Seeds included 2- and 6-rowed landraces and light and dark colored...
Poster
Berberis species are important alternate hosts and generate new races of stem rust fungus, Puccinia graminis f. sp. tritici and yellow (stripe) rust fungus Puccinia striiformis. Berberis species are common in Kastamonu province of Turkey. In 2016 and 2017, surveys were conducted in Kastamonu province in order to elucidate aecial infection status of...
Article
Full-text available
Pestalotiopsis geniş konukçu dizisine sahip bir cinsdir. Fungus dünyada birçok bölgede tespit edilmiş olup, genellikle tropik ve subtropik bölgelerde gözlenmiştir. Dünyada Hindistan, Çin, Tayland, Japonya, Güney Kore, Türkiye, İran, Brezilya gibi ülkelerden rapor edilmiştir. Değişik Pestalotiopsis türleri çay (Camellia sinensis) ve kivi (Actinidia...
Article
Full-text available
Leaf diseases occurring on barley and wheat fields in Çubuk district of Ankara, Turkey were determined. Eighteen barley fields and 17 wheat fields were inspected for the leaf diseases in 2016. In barley fields, diseases caused by Drechslera teres f. maculata, Drechslera teres f. teres, Drechslera graminea, Rhynchosporium secalis, Erysiphe graminis...
Article
Full-text available
Barley (Hordeum vulgare L.) landraces are good source of disease resistance. In this study, twenty-five Iranian barley landraces obtained from different regions of northwest Iran were evaluated for their resistance status to Drechslera graminea, the causal agent of the barley stripe disease. Three single spore isolates of the fungus obtained from K...
Article
Full-text available
Stem rust caused by Puccinia graminis f. sp. tritici is an important pathogen of wheat in Turkey. In 2016, a survey was conducted in Sinop province of Turkey in order to elucidate distribution of stem rust in that region. Thirty one wheat fields in Saraydüzü, Durağan, Boyabat and Gerze districts of Sinop province were surveyed. Stem rust was found...
Article
Full-text available
Sixty-five hulless barley F5 populations obtained from ICARDA were examined for foliar diseases at adult stages under field conditions in Ankara, Turkey. Each population contained about 25-30 single heads. From 65 populations, a total of 1818 hulless single head barleys were planted. These plants were evaluated for their resistance status to foliar...
Article
Full-text available
Twenty two barley landrace populations obtained from different regions of northwest Iran were evaluated for their resistance status to foliar diseases under field conditions in Ankara, Turkey. Landrace populations exhibited differences in terms of disease resistance. Scald caused by Rhynchosporium secalis, yellow rust caused by Puccinia striiformis...
Article
Full-text available
Barley stripe disease caused by the fungus Drechslera graminea (teleomorph: Pyrenophora graminea) is an important disease of barley (Hordeum vulgare L). Twenty-three Turkish hulless barley lines were evaluated for their resistance status using 3 single spore isolates of Drechslera graminea. Kayseri isolate was found as the most virulent isolate. On...
Chapter
Tea is one of the most widely consumed beverages after water in the world. It has delicate requirements in terms of agricultural and factorial processing. Tea is a popular drink; however, its biotic and abiotic stresses are lowering the quality of brewed tea. Researchers have concentrated mostly on its cultivation and processing or its sustainabili...
Article
The paper presents the results of the immunological evaluation of the varieties of spring wheat of the 17F1SYNT-OMSK-LIST farm: 90 samples and 7 susceptible local varieties jointly created by scientific institutions of Kazakhstan, Western Siberia and the CIMMYT International Wheat and Maize Improvement Center in conditions of the southeast of Kazak...
Article
Full-text available
z Köy çeşitleri, özellikle kuru tarım alanlarında yürütülen ıslah programlarının en önemli gen kaynaklarından biridir. Seleksiyonda kullanılacak veya bir ıslah programında ebeveyn olarak yararlanılacak köy çeşitlerinin genetik varyasyon sınırlarının belirlenmesi ve hedef çevrelerdeki mevcut çeşitlere göre üstün olanların saptanması ıslah çalışmasın...
Conference Paper
Barley stripe disease caused by the fungus Drechslera graminea (teleomorph: Pyrenophora graminea) is an important disease of barley (Hordeum vulgare L). Twenty-three Turkish hulless barley lines were evaluated for their resistance status using 3 single spore isolates of Drechslera graminea. Kayseri isolate was found as the most virulent isolate. On...
Article
Seedling response of 39 cultivars of barley commonly grown in Turkey to spot blotch disease agent was determined under greenhouse conditions. The reactions of the barley cultivars differed in their response to pathogen isolates. Different reactions to different isolates were also observed. Differences in virulence levels among the isolates were evi...
Article
Full-text available
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...
Article
Full-text available
Arpanın (Hordeum vulgare) gen merkezlerinden birisi olan Türkiye ve yakın çevresinde 2- sıralı yabani arpa (Hordeum spontaneum) çok yaygın olarak bulunmaktadır Yabani arpa (Hordeum spontaneum) hastalıklara dayanıklılık yönünden çok değerli bir kaynaktır. Hordeum spontaneum ile yapılan dayanıklılık çalışmalarında ümitvar sonuçlar elde edilmiştir. Bu...
Article
An extensive survey was carried out to collect Fusarium species colonizing the lower stems (crowns) of bread wheat (Triticum aestivum L.) and durum wheat (T. durum Desf.) from different wheat growing regions of Turkey in summer 2013. Samples were collected from 200 fields representing the major wheat cultivation areas in Turkey, and fungi were isol...