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Browsing by Author "Demir, S"

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    Article
    Biological Control of Fusarium Wilt in Tomato Caused by Fusarium Oxysporum F. Sp Lycopersici by Amf Glomus Intraradices and Some Rhizobacteria
    (Wiley-blackwell, 2005) Akköprü, A; Demir, S
    In the present study, the effects of the arbuscular mycorrhizal fungus (AMF) Glomus intraradices Schenck & Smith and four rhizobacteria (RB; 58/1 and D/2: Pseudomonas fluorescens biovar II; 17: P. putida; 21: Enterobacter cloacae), which are the important members of the rhizosphere microflora and biological control agents against plant diseases, were examined in the pathosystem of Fusarium oxysporum f. sp. lycopersici [(Sacc) Syd. et Hans] (FOL) and tomato with respect to morphological parameters (fresh and dry root weight) and phosphorous (P) concentration in the roots. Treatments with single and dual inoculation with G. intraradices and RB strains reduced disease severity by 8.6-58.6%. Individual bacteria inoculations were more effective than both the single AMF and dual (G. intraradices + RB) inoculations. In addition, the RB and G. intraradices enhanced dry root weight effectively. Significant increases in root weights were recorded particularly in the triple inoculations compared with single or dual inoculations. Compared with the non-treated controls all biological control agents increased P-content of treated roots of plants. Colonization with RB increased especially in triple (FOL + G. intraradices + RB) inoculations whereas colonization of G. intraradices was significantly decreased in treatment of FOL + G. intraradices compared with triple inoculations. The results suggest that suitable combinations of these biocontrol agents may ameliorate plant growth and health.
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    Article
    Reactions of Melon Landraces Grown in the Lake Van Basin To the Physiologic Races (Race 1 and Race 2) of Fusarium Oxysporum F. Sp Melonis
    (Eugen Ulmer Gmbh Co, 2006) Demir, S; Turkmen, Ö; Sensoy, S; Akköprü, A; Erdinç, Ç; Yildiz, M; Kabay, T
    Disease incidence and varietal reactions of 51 melon landraces collected from Lake Van Basin, one of the secondary gene center of melon, to the physiologic races (the race I and the race 2) of Fusarium oxysporum f. sp. melonis (F.o.m.) were determined by artificial inoculations. The study was carried out in a growth chamber and pathogen isolates of the races were incubated in a medium containing corn meal and sand, and then this inoculation source was mixed with a seedling growth medium at the rate of 5% (final density: 10(6) conidia ml(-1)). Melon seedlings were evaluated with a 0-3 scale four weeks after the seed sowing in order to detect disease incidence. Disease incidence in melon genotypes against the race 1 and race 2 of F.o.m. ranged between 23% and 100% and between 7% and 100%, respectively. Moreover, F.o.m. races 1 and 2 did not form any disease incidence in four and one melon genotypes, respectively. One of the melon genotypes, 65 ERC 03, was found to be resistant to both races.