Abstract
In this research, the salt tolerance of salt-tolerant (Avci-2002) and salt-sensitive (Tokak 157/37) barley cultivars was analyzed. The seedlings were grown in a hydroponic culture containing 0, 100, 200 and 300 mM NaCl. The decrease in dry weight was more significant in Tokak 157/37 than in Avci-2002. On the other hand, no significant correlations were found between the altered d aminolevulinic acid dehydratase (ALAD) activity and the chlorophyll content. The chlorophyll and carotenoid contents in leaves of Avci-2002 decreased significantly at only 300 mM NaCl, whereas the pigment contents of Tokak 157/37 decreased at all NaCl concentrations. The increase in proline content was significantly higher in Avci-2002 than in Tokak 157/37 at 300 mM NaCl. The lipid peroxidation level measured in terms of malondialdehyde (MDA) content was higher in Tokak 157/37 than in Avci-2002. Salt stress caused significant increases in superoxide dismutase (SOD), guaiacol peroxidase (POD), ascorbate peroxidase (APX) and catalase (CAT) activity. However, Avci-2002 had relatively lower SOD and CAT activities and higher POD and APX activities than Tokak 157/37. As a result, dry weight, pigments content, proline content, lipid peroxidation and activities of POD and APX results are in good correlation with supporting Avci-2002 being relatively salt-tolerant.
Highlights
Salinity affects almost every aspect of the physiology and biochemistry of plants and significantly reduces yield
The aim of this study is to evaluate the comparative effects of different concentrations of NaCl salinity on growth, chlorophyll biosynthesis, proline content, lipid peroxidation and superoxide dismutase (SOD), POD, ascorbate peroxidase (APX) and CAT activity of salt-tolerant (Avcı-2002) and saltsensitive (Tokak 157/37) barley cultivars at early seedling stage
In order to evaluate salt tolerance of salt-tolerant Avcı-2002 and salt-sensitive Tokak 157/37 barley cultivars at early seedling stage, dry weights of shoots and roots were tested under the effect of NaCl salinity
Summary
Salinity affects almost every aspect of the physiology and biochemistry of plants and significantly reduces yield. Salinity stress induce enhanced production of the reactive oxygen species (ROS) such as superoxide radicals (O2 ̇ˉ), singlet oxygen (1O2), hydroxyl radicals (OH) and hydrogen peroxide (H2O2) in plants (Misra & Gupta 2006; Kholová et al 2010). Cell membrane stability has widely been utilized to differentiate salt-tolerant and salt-sensitive cultivars (Meloni et al 2003). Salinity promotes oxidative stress and plants with high constitutive and induced antioxidant enzymes have better tolerance to damage (Parida & Das 2005). Comparison of the responses of cultivars and/or related species that exhibit differential sensitivity to salt stress showed a correlation between salt tolerance and increased activity of the antioxidant system (Neto et al 2006; Athar et al 2008)
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