Yazar "Morgounov, Alexey" seçeneğine göre listele

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    First report of Fusarium culmorum and Microdochium bolleyi causing root rot on Triticale in Kazakhstan
    (AMER PHYTOPATHOLOGICAL SOC, 2021) Alkan, Mehtap; Özer, Göksel; İmren, Mustafa; Özdemir, Fatih; Morgounov, Alexey
    Triticale (×Triticosecale Wittmack) is obtained from wheat × rye crossing. It is positioned between wheat and rye in terms of resistance to soilborne pathogens including Gaeumannomyces graminis var. tritici, Fusarium culmorum, F. avenaceum, and Bipolaris sorokiniana (Arseniuk and Góral 2015). In 2019, seven triticale fields were surveyed in Almaty Province, Kazakhstan, to examine soilborne fungal pathogens. A total of 28 symptomatic plants with stunting, rot, or discolored root were collected. The overall disease incidence was ∼8 to 10%. Fungi were isolated from 3- to 5-mm pieces excised from symptomatic tissues. The pieces were surface disinfected in 1% NaOCl for 2 min, rinsed three times with sterile distilled water, blotted dry, and plated on 1/5-strength PDA amended with 0.01% streptomycin. Plates were left in the dark at 23°C for 7 days. A total of 34 colonies were isolated, of which 19 isolates originally from six fields showed the characteristics of B. sorokiniana.
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    Plant-parasitic nematodes associated with wheat in Central, Eastern, and Southeastern Kazakhstan
    (American Phytopathological Society, 2021) İmren, Mustafa; Özer, Göksel; Paulitz, Timothy C.; Morgounov, Alexey; Dababat, Abdelfattah Amer
    Kazakhstan is one of the biggest wheat producers, however, its wheat production is far below the average international wheat production standard due to biotic and abiotic stressors. Plant-parasitic nematodes are devastating for cereal production systems worldwide. A comprehensive survey was conducted in 2019 to identify plant-parasitic nematodes associated with wheat in different locations of central, eastern, and southeastern Kazakhstan. The results revealed 33 root-lesion and 27 cyst nematode populations from the 77 localities sampled. These two genera occurred in separate or in mixed populations. The root-lesion populations were identified as Pratylenchus neglectus and P. thornei while all cyst nematodes were identified as Heterodera filipjevi. The identification of nematodes was firstly performed based on morphological and morphometric features and confirmed by BLAST and phylogenetic analyses based on the internal transcribed spacer and the D2-D3 expansion located in the 28S gene of ribosomal DNA for CCN and RLN populations, respectively. Pratylenchus neglectus and P. thornei populations from Kazakhstan showed a high similarity with the American, European, and Asian populations. Heterodera filipjevi populations formed a well-supported cluster with the corresponding populations from different countries and showed a slightly intraspecific polymorphism. Kazakhstan populations of H. filipjevi may have multiple introductions in Kazakhstan due to the divergence among them. The results of this study are of great importance for breeding programs and will enable awareness for extension advisors to develop measures to control these nematodes in cereal cropping areas in Kazakhstan.