Browsing by Author "Ozturkci, Yusuf"

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Isolation and Characterization of Endophytic Bacteria From the Poaceae Family: Assessing Their Impact on Drought Stress and Plant Growth in Wheat
(Springer, 2025) Akkopru, Ahmet; Taskin, Bilgin; Arpali, Digdem; Ucar, Ceylan Pinar; Yardim, Dilek Ozcan; Ozturkci, Yusuf
Limited water resources and the increasing impact of global warming highlight the importance of endophytic bacteria (EB) given their unique tolerance to drought stress. In this study, we isolated EB from cultivated and wild Poaceae family members grown in arid or challenging environments in Lake Van Basin. We aimed to reveal plant growth promoting (PGP) characters in EB and to determine their potential to promote plant growth and reduce the effect of different drought levels in two different wheat cultivars (Tir (tolerant) and Bezostaja-1). 410 EB were isolated from 135 plants belonging to 19 taxa at different periods. In vitro tests revealed that 73.1% of the isolates can synthesize indole acetic acid (IAA), 34.4% can fix nitrogen, 37% can synthesize 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase (ACCd), 37.6% can solubilize phosphorus, and 93.9% can synthesize siderophore. IAA production and phosphorous solubility were the most common characters, coexisting in 59% of EBs. ACCd production, phosphorus solubilization, and nitrogen fixation were the most common features with a triple association of 0.49%. Although isolates selected according to EB characters showed differing effects on coleoptile, root and shoot length, germination percentage, shoot and root weight, and relative water content (RWC) in the early development period (EDP) of Bezostaja-1 cultivar under drought stress, some isolates had negative effects. However, Pseudomonas asturiensis G58S1, Pantoea agglomerans G129K1-1, Chryseobacterium rhizosphaerae G129S2, Acinetobacter calcoaceticus G118K1T, and Stenotrophomonas sp. G109K2-K isolates selected according to PGP trials and EDP results showed improved plant biomass, chlorophyll content, membrane permeability, germination power, and RCW, and protective effects against drought.
Recovering Wheat (Triticum Aestivum L.) To Intake Mineral Nutrient Components Under Drought Stress With Salicylic Acid
(Parlar Scientific Publications (p S P), 2016) Arpali, Digdem; Furan, M. Alp; Ozturkci, Yusuf
This research was conducted to determine the effect of changes of certain minerals (Ca, Mg, Mn, Fe, Cu, Zn) in salicylic acid doses on different wheat varieties (Dogu-88, Altay-2000, Bezostaya-1, Alparslan and Tir mixed population) in drought stress. Drought was created in plants by irrigating 40% of field capacity. It was found that plants were differently responding to drought of mineral accumulation. 1 mM kg-1 dose of salicylic acid, compared to 0.1 mM kg-1 dose significantly increased the mineral content in flag leaf of all varieties to be statistically. The increase was found to be highest in Bezostaya 1 and Altay-2000 varieties. This research has shown that mineral contents are significantly decreased with the drought in wheat varieties, and it was concluded that salicylic acid treatment affected to all varieties positively although this effect is different according to the varieties.