Yazar "Catal, Mursel" seçeneğine göre listele

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    Molecular characterizations of Verticillium dahliae isolates from grafted tomatoes grown in Antalya province of Türkiye
    (Wiley, 2024) Akar, Hasan; Cat, Ahmet; Catal, Mursel
    Verticillium wilt caused by soil-borne fungus Verticillium dahliae results in serious quality, yield and economic losses in tomato fruit production in tomato-growing areas around the world. In this study, V. dahliae isolates obtained from six different major grafted tomato production areas in Antalya province of Turkiye were characterized for races, pathotypes and vegetative compatibility groups using the specific PCR primers. Out of 66 isolates, 60 were determined to be race 2. Six isolates were not identified as race 1 or race 2. Fifty-six isolates were determined as defoliating pathotypes (D) while 10 isolates were identified as non-defoliating (ND) pathotypes. The isolates were clustered into four vegetative compatibility groups (VCGs): VCG1A (61), VCG2A or VCG4B (3), VCG2B (1) and VCG6 (1). According to the results of this study, the race 2, D pathotype and VCG1A isolates were dominant and widely distributed in the region. Additionally, the V. dahliae isolates fall into two major groups based on the dendrogram constructed from molecular data by Dice similarity index. The dendrogram showed significant diversity among the V. dahliae isolates particularly in the Elmali region compared to other regions. The study is the first comprehensive research with the current disease and race 2 was identified for the first time in grafted tomatoes. These findings will lead to the development of V. dahliae-resistant grafted tomatoes and breeding programs in Turkiye.
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    Races of Puccinia striiformis f. sp. tritici identified from the coastal areas of Turkey
    (Taylor & Francis Inc, 2021) Cat, Ahmet; Tekin, Mehmet; Akan, Kadir; Akar, Taner; Catal, Mursel
    Stripe rust, caused by Puccinia striiformis f. sp. tritici, is a devastating disease of wheat in Turkey and worldwide. This pathogen can overcome known resistance genes and negatively affect the wheat production. The objectives of this study were to determine the virulence patterns of wheat stripe rust isolates collected from the coastal areas (Aegean and Mediterranean regions) of Turkey, and to examine the genetic diversity of the pathogen populations by simple sequence repeat (SSR) marker analysis. The majority of the isolates collected were virulent at various frequencies on the resistance genes Yr1 (50%), Yr6 (100%), Yr7 (78%), Yr8 (50%), Yr9 (84%), Yr10 (25%), Yr17 (38%), Yr24 (22%), Yr27 (31%), Yr32 (22%), Yr43 (47%), Yr44 (6%), YrSp (41%), YrTr1 (6%), and avirulent on Yr5 and Yr15. Based on the analysis of virulence, all isolates were determined as 25 races and clustered into six virulence groups (VGs). In contrast, the isolates clustered into four molecular groups (MGs) based on genotypic data. All four MGs were found in Aegean region of Turkey, while only three MGs (MG1, MG2 and MG3) were found in the Mediterranean region of the country. Additionally, analysis of molecular variance indicated that 80.9% of genetic variation was found within regions and 19.1% was found between the regions. The results suggest that interregional migration of the pathogen was high. The data can be helpful for the management of stripe rust and understanding the population structure and migration of Pst in Turkey.
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    Virulence characterization of the wheat stripe rust pathogen, Puccinia striiformis f. sp. tritici, in Turkey from 2018 to 2020
    (Taylor & Francis Inc, 2023) Cat, Ahmet; Tekin, Mehmet; Akan, Kadir; Akar, Taner; Catal, Mursel
    Stripe (yellow) rust caused by Puccinia striiformis f. sp. tritici (Pst) is the most devastating disease of wheat in Turkey. Virulence characterization of the Pst population is critical to prevent large-scale epidemics, by developing wheat cultivars with durable resistance against the disease. In this study, 38 Pst races, including 25 races that were not previously reported, were identified from 140 isolates obtained from most regions of Turkey from 2018 to 2020 using a differential set containing 18 single Yr gene wheat lines (NILs) of 'Avocet'. Virulence to Yr15 was not observed among any of the isolates. Virulence to the remaining 17-Yr genes was detected at various frequencies. The frequencies of virulence to Yr6, Yr9, Yr7, Yr8, Yr43, YrExp2, Yr44, YrTr1, and Yr27 were high (57.1 to 100.0%), to Yr1, Yr17, Yr32, and YrTye were moderate (24.3 to 42.9%), and to YrSP, Yr24, and Yr10 were low (9.3 to 17.1%). Only one race was virulent to Yr5 (0.7%). Many of the races identified were common among regions, indicating that Pst races migrate throughout Turkey. However, the Black Sea (BS) and the Mediterranean (ME) regions were differentiated from other regions by unique races absent in other regions, and the Yr5-virulent race, respectively. To sum up, the virulences of the races identified and their distributions among regions provided an understanding of pathogen migration and may contribute to the development of resistant wheat cultivars against stripe rust.