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Browsing by Author "Turker, M"

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    Effect of the Air Pollutant Sulfur Dioxide on Phytohormone Levels in Some Lichens
    (Parlar Scientific Publications (p S P), 2004) Battal, P; Aslan, A; Turker, M; Uzun, Y
    In the present study the effect of sulfur dioxide pollution on phytohormonal levels and morphological changes in lichens was investigated. Fumigated sulfur dioxide was applied to Dermatocarpon intestiniforme (Korber) Hasse, Flavoparmelia caperata (L.) Hale, Lecanora muralis (Schreber) Rabenh., Neofuscelia pulla (Ach.) Essl., Rhizocarpon geographicum (L.) DC., Rhizoplaca melanophythalma (DC.) Leuck.& Poelt, Tephromela atra (Huds.) Hafellner, and Xanthophoria elegans (Link.) Th. Fr. in a glass chamber. Dermatocarpon intestinifiorma and Leconara muralis were found to be the most tolerant species. Significant changes in giberellic acid (GA(3))-equivalents, indole-3-acetic acid (IAA), trans-zeatin (t-Z) and abscisic acid (ABA) levels and morphological degeneration were found in most of the lichen species compared to control samples, but also cholorosis, necrosis, detachment from the substrate and chlorophyll breakdown could be observed. ABA levels increased in all lichen species from approx. 1/3 to 8-fold, whereas zeatin levels decreased between 21% and 76%. Elevated levels of GA(3)-equivalents were found in Dermatocarpon intestiniforme, Neofuscelia pulla and Leconara muralis. However, the level of GA(3)-equivalents decreased between 15% and 45% in the others. The levels of IAA were found to be 35% higher in Leconara muralis. A significant change was not determined in Dermatocarpon intestiniforme, whereas IAA values decreased from 16% to 89% in the other species examined.
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    Article
    Effects of Different Mineral Nutrients on Abscisic Acid in Maize (Zea Mays)
    (Finnish Zoological Botanical Publishing Board, 2003) Battal, P; Turker, M; Tileklioglu, B
    The effects of different concentrations of various macroelements on growth and endogenous ABA (absisic acid) levels in root, stem, leaf and flower tissue of maize (Zea mays) were studied. Plants were cultivated in sand and supplied twice a week with a nutrient solution containing optimum, excessive or deficient concentrations of nitro(Yen. phosphorus, potassium, calcium, magnesium, sulphur and iron. Plants were harvested at three different stages: vegetative (4-5 leaves), flowering, and fruiting. Fresh weight, leaf and stem size, leaf number and ABA concentrations differed remarkably between plants cultured in abnormal concentrations of macroelements compared to the controls. In general, deprivation of macroelements caused an increase in ABA levels. Deficiency of N, P, K, S and Fe in the nutrient solution resulted in marked increases in the levels of ABA extracted from root, leaf, stem and flower at the three developmental stages. Excessive concentrations of these macroelements resulted in a decrease in ABA levels in all parts of plants at all three stages as compared with their respective controls. ABA levels in roots, stems, and leaves were elevated from 3% to 159% in N, P, K, and S limited plants whereas the levels of ABA in these same organs were reduced from 1% to 98% in the presence of excessive levels of N, K, P and S.