عنوان مجله
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Yuzuncu Yil University Journal of Agricultural Sciences
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کلیدواژهها
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Antioxidant enzymes, Salinity, Osmotic regulation, Oxidative stress, Wheat
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چکیده
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Wheat is one of the main crops occupying a large area in the world and also in Iran. Salinity is
one of the factors that decrease wheat growth and productivity. Therefore, to study the effects of different
salinity levels, changes in lipid peroxidation, antioxidant enzyme activities [catalase (CAT), ascorbate
peroxidase (APX) and guaiacol peroxidase (GPX)], hydrogen peroxide (H2O2), membrane stability index
(MSI), relative water content (RWC), soluble sugars, sodium (Na+) and potassium (K+) ions in two wheat
varieties (Hirmand and Karkheh) were investigated. Seedlings were subjected to 100 and 200 mM NaCl
and hoagland’s solution as control for 20 days. Salinity stress increased GPX and CAT in both cultivars
compared with control. At the same time, the APX enzyme increased in ‘Hirmand’, but had no significant
change in ‘Karkheh’ compared with control. The amount of H2O2 in ‘Hirmand’ did not significantly
change in the saline condition compared with control, but showed a significant increase in ‘Karkheh’. The
amount of malondialdehyde (MDA) in both cultivars under saline conditions increased in comparison
with control. However, the highest increase was related to ‘Karkheh’. The results also showed a decrease
in MSI in both of the cultivars. RWC decreased significantly in ‘Karkheh’ while in ‘Hirmand’ there was
no significant change. Soluble sugars in both cultivars increased. The results indicated an increase in Na+
in both cultivars. But K+ reduced in ‘Karkheh’ and did not change significantly in ‘Hirmand’. The
K+/Na+ ratio also decreased in both cultivars. These findings possibly suggest that by inducing the activity
of antioxidant enzymes, no decrease in RWC, and K+, low increase of Na+ and increasing the soluble
sugars, ‘Hirmand’ has a better protection mechanism against salt-induced oxidative damage than
‘Karkheh’.
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