جستجوی مقالات مرتبط با کلیدواژه "مالون دی آلدئید و محتوای پرولین" در نشریات گروه "زراعت"

Glycine betaine (GB) is one of the osmotic plant-protecting members that accumulate in response to abiotic stresses. An experiment was، therefore، conducted to test whether GB application at various concentrations (0، 10، 20 and 30 mM) through seed soaking or foliar spray methods would protect cucumber seedlings، subjected to chilling stress. At two true leave stages، after GB treatment، the seedlings were exposed to chilling six h/day at 3°C for 6 days. Results showed that GB pre-treatment improved growth parameters of seedlings subjected to chilling stress and provided significant protection against chilling stress compared to non-GB-treated seedlings. GB prevented chilling injuries with increasing chlorophyll، proline content and antioxidant activities and decreasing electrolyte leakage، malondialdehyde and hydrogen peroxide content. The highest cold tolerance was obtained with 20 and 30 mM GB application and seed soaking method provided better protection compared to foliar spray method.

Copper and Nickel are an essential micronutrient for plants، playing an important role in maintaining plants'' natural metabolism and growth، but in excess both heavy metal are also a proven inhibitor of various physiological functions. In this study maize (Zea mays L.) plants grown in hydroponic culture were treated with 0، 50 and 100 μm CuSO4 and 0، 100 and 200 μm NiSO4. Growth parameters and some biochemical changes were studied in roots and shoots of plants. The results showed that with increasing Cu and Ni concentration، root and shoot weight (27 to 52% in root and 24 to 62% in shoot)، root and shoot length (14 to 59% in root and 9 to 46% in shoot)، pigment contents (chlorophyll a 14 to 67%، chlorophyll b 32 to 79% and total carotenoids 25 to 74%)، reduction of dichlorophenol indophenol (48 to 67%) were decreased in contrast to controls، while soluble sugars leakage (0/5 to 2 fold)، K+ leakage (0/25 to 30 fold) and malondealdyde as indicator lipid of peroxidation (48 to 152% in root and 54 to 190% in shoot)، cell death (5 fold) and prolin content (12 to 29% in root and 9 to 107% in shoot) were increased in contrast to controls. The result showed that the maximum effects in growth parameters and some biochemical changes were observed in 200 μm Ni + 100 μm Cu. However، interaction of Cu and Ni were cooperation effects on together and was more effective compared to the others treatments.