Journal of Biological and Environmental Sciences

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Browsing by Subject "Abiotic stress"

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    Growth and physiological responses of ‘Chrysanthemum paludosum’ under salinity stress
    (Uludağ Üniversitesi, 2017-06-20) Yasemin, Sara; Köksal, Nezihe; Özkaya, Aslıhan; Yener, Mithat
    Chrysanthemum paludosum, belongs to Asteraceae family, is a perennial medicinal herb and ornamental plant. It has aesthetical values together with several medical effects such as antibacterial, antifungal, insecticidal, antioxidant, nervous, cytotoxic etc. Excess of salinity in soils is one of the major problems which reduce plant growth. The purpose of this study was to determine the effects of salinity on C. paludosum by assaying plant growth and some physiological traits. C. paludosum plants were irrigated with five different levels of NaCl concentrations (0, 50, 100, 150, 200 mM) for 30 days with 3 days intervals in pots under greenhouse conditions. The effects of salinity stress on diameter of flower and disc floret, number of flowers, shoot height, root length, thickness of root collar and stem, fresh weights of root and shoot, dry weights of root and shoot, leaf chlorophyll concentration (SPAD readings), moisture content on wet basis, relative water content and ion leakage were investigated. According to the results, flower diameters, disc florets, number of flowers, shoot height, root collar thickness, root and shoot fresh weights were negatively affected in 150 and 200 mM NaCl treatments. In parallel, ion leakage also highly increased in 150 and 200 mM NaCl treatments. Leaf chlorophyll concentrations decreased by increasing salinity levels.
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    In vitro antagonistic activity against fusarium species of local Trichoderma spp. isolates
    (Uludağ Üniversitesi, 2017-06-28) Küçük, Çiğdem
    Trichoderma spp. isolates were isolated from rhizosphere soils of cotton and maize. The antagonistic effects of local isolates of Trichoderma sp. against some Fusarium species such as Fusarium solani, F.moniliforme, F.culmorum, F.verticillioides and F.chlamydosporum were studied by using the dual culture technique. The isolates of Trichoderma spp. had a inhibitory effects on the growth of tested Fusarium species. Also, the influence of abiotic stress such as temperature, drought and NaCl on the growth of Trichoderma isolates was studied in this study. The most resistant isolates to abiotic stress were T8, T12 and T14, respectively. The specific activity of chitinase produced by local isolates was tested. The antagonist T8 isolate produced higher chitinase activity in culture supernatant.