2010 Cilt 24 Sayı 1

Permanent URI for this collectionhttps://hdl.handle.net/11452/1828

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    Introduction of Steinernema Carpocapsae Weiser, 1955 (Rhabditida: Steinernematidae) from natural population of white grub, Polyphylla Olivieri (Coleoptera: Melolonthidae) from Iran
    (Uludağ Üniversitesi, 2010) Karimi, Javad; Kharazi-Pakdel, Aziz; Yoshiga, Toyoshi; Koohi-Habibi, Mina
    White grub, Polyphylla olivieri Cast. (Col., Melolonthidae) is major pest of the Iran. In a survey for collecting natural entomopathogenic nematodes associated with this melolonthid, two isolates of Steinernema spp. were collected as natural pathogens in larval populations of the white grub in the Tehran province of Iran. Morphological characters identified those as members of “carpocapsae “group. Morphological and molecular characters using ITS sequences as well cross hybridization tests confirmed those as S.carpocapsae.16S rRNA sequences and phenotypic characters of symbiotic bacteria were determined and used for identification. Phylogenetic analysis for studying relationship was performed. This is the first information about this pathogen of P.olivieri as well new information about symbiotic bacteriua associated with Iranian entomopathogenic nematodes.
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    One sided UV-C treatments maintain quality of fresh-cut green onions
    (Uludağ Üniversitesi, 2010) Kasım, Rezzan; Kasım, M. Ufuk
    Storage quality of fresh-cut green onions as affected by UV-C treatments, so in this research the effect of UV-C treatments on quality was investigated in fresh-cut green onions. Four different UV-C treatments were used for ultraviole radiation to onions, and non-treated samples as evaluated control group. After UV-C treatments onions were stored at 5o C and 85-90% RH for 15 days. Quality attributes of samples were evaluated periodically in terms of antioxidant activity, electroliyte leakage, color, weight loss, decay percentage and inner leaf extension. Electrolyte leakage of fresh-cut green onions was getting high with the higher doses of UV-C so, the lower doses can be used for controlled pathogen growth because of both lower electrolyte leakage and lower decay percentage at the day 10th. L* value of white stem tissues maintain best in UV-C5 treatment whereas green color of hollow green tissues was retained best in UV-C3 treatment. Onions in UV-C15 treatment were shown noticeable yellowing however inner leaf extension of onions was effectively controlled by the UV-C15 treatment. Antioxidant activity of fresh-cut green onion was enhanced higher doses of UV-C treatments, especially UV-C15.