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    THE EFFECT OF APPLICATION OF PHYTOTOXIC LEVELS OF BORON ALONG WITH SULPHUR ON NUTRIENT CONTENT IN COTTON (Gossypium hirsutum L.)
    (Univ Agronomic Sciences & Veterinary Medicine Bucharest - Usamv, 2017) Kurt, Firat; Temiz, Mefhar Gultekin
    This study was carried out determining the effect of phytotoxic boron along with sulphur fertilizers on nutrient content in cotton in the research field of the department of field crops at Dicle University between 2013 and 2014. In the trial designed in randomized complete split block, the effect of two sulphur doses (0-100 kg da(-1)) and four boron doses ( 0, 2.5, 5 and 15 mg kg(-1)) on nutrient concentrations of cotton leaves were examined. According to the results, 5 and 15 mg kg(-1) of B treatments with and without sulphur did not cause any visible toxic symptoms in cotton. Moreover, the treatments resulted in uptake of N, P, K, Fe, Zn and Mn nutrients in sufficiency ranges whereas Ca, S, Mg, Cu and Mo concentrations were lower than required concentration ranges of these nutrients. B content of leaves was found in sufficient range in plots where phytotoxic level of B was used. The effect of S application over N, K, Ca, B, Mn and Mo content of leaves showed decrease of these nutrients' concentrations but an increase the concentrations of S, Mg, Fe, Zn and Cu. In addition to this, the content of Mo was the lowest among nutrients. In terms of B and S interaction, P concentrations showed inconsistent results during the study.
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    A key gene bHLH115 in iron homeostasis: comprehensive bioinformatics analyses in Arabidopsis, tomato, rice, and maize
    (Springer, 2019) Kurt, Firat; Filiz, Ertugrul; Kurt, Baris
    bHLH115 transcription factor (TF) is a positive regulator of the Fe-deficiency and plays essential roles in the stress-related regulation network. In this study, orthologous bHLH115 genes in Arabidopsis, tomato, rice, and maize were analyzed using in silico methods. All bHLH115 proteins contained PF00010 (HLH: Helix-loop-helix DNA-binding domain) domain structure andtheir sub-cellular localizations were predicted as nucleus. The bHLH115 orthologues in monocots and dicots clearly diverged from each other. The expression analyses revealed that orthologous genes of bHLH115 in queried species were highly expressed in seed parts, leaf, stem, and flower parts. The bHLH115 genes were co-expressed with genes in plant defense system, and withgenes involving inbiotic and abiotic stress responses. In terms of protein structures, OsbHLH115 and ZmbHLH115, and AtbHLH115 and SlbHLH115 had the highest protein structure similarities. In addition, bHLH115 proteins have bZIP, bHLH and MYB transcription factor binding sites strengthens their engagement in various metabolic ways. Molecular docking analyses showed the different binding sites based on plant species, suggesting functional flexibilities of bHLH115 gene.
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    Nitrogen Rate and Timing Implementation on Durum Wheat in a Bed Planting System
    (Univ Kebangsaan Malaysia, 2016) Yildirim, Mehmet; Yakut, Zeki; Akinci, Cuma; Kurt, Firat; Kizilgeci, Ferhat
    The effects of nitrogen (N) fertilization at different growth stages were investigated on durum wheat (Triticum durum L.) grain yield and yield components (with irrigated bed planting) in Diyarbakir, Turkey. N was applied at a rate of 140 kg ha(-1) and distributed to one, two and three applications at various combinations with five different growth stages (i.e. sowing, seedling growth, early tillering, stem elongation and booting). This study included 13 treatments, including the control (zero nitrogen). The N application timings (NAT) of the 50% sowing + 50% early tillering and 66% sowing + 33% early tillering treatments were most suitable for durum wheat. The results showed that NAT had significant effect on flowering time, SPAD readings of the early milky ripe stage, plant density, thousand kernel weights, grain filling duration, grain filling rate, grain N content, grain yield, harvest index and grain N yield. In summary, the highest values of parameters studied were obtained from the 50% sowing + 50% first tillering and 66% sowing + 33% early tillering treatments. N fertilization application rate and time of durum wheat genotypes should consist of applying 50-60% of the total N fertilizer at sowing and 40-50% at the early tillering stage under irrigated conditions and with bed planting.
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    THE RESPONSE OF COTTON (GOSSYPIUM HIRSUTUM L.) TO SOIL APPLIED ELEMENTAL SULPHUR UNDER BORON TOXICITY
    (Parlar Scientific Publications (P S P), 2016) Kurt, Firat; GultekinTemiz, Mefhar
    This study was conducted between 2013 and 2014 to determine the effect of sulphur fertilization on boron toxicity in cotton. Two sulphur doses (0-1 that) as main plots and four boron doses (0, 2.5 ppm, 5 ppm and15 ppm) as subplots were arranged in randomized complete split block design. According to the results, despite lack of phytotoxic symptoms of B, 5 mg B kg(-1), B treatment showed significant effects on seed cotton yield, gin turnout, fiber maturity, and fiber elongation. However, the influence of B was uneven and inconsistent between years and among B dosages. Therefore, it could be concluded that higher doses of B applications should be avoided for higher lint yield and fiber qualities. In terms of S application, the amount of S dose employed in this study significantly decreased seed cotton yield and gin turnout; however, it had no effect on other lint quality parameters. This result may be of particular importance to the cotton growing soils with higher pH, which is required in applying higher doses of sulphur for optimum yields.