جستجوی مقالات مرتبط با کلیدواژه "prolin content" در نشریات گروه "زراعت"

To study effects of different levels of nitrogen fertilizer and cytokinin on some physiological traits of wheat cv. Chamran under normal and post anthesis heat stress conditions, this experiment was conducted at Ramin Agriculture and Natural Resources University, Ahvaz, Iran, in 2012-2013 growing season. The experiment was carried out in two separate factorial experiments using randomized complete block design with four replications.The first experiment was planted in normal date of sowing (05 December 2012) and the second experiment was planted late (20 January 2013) to expose the experimental treatments to terminal heat stress. In both experiments, nitrogen (N) was applied at four levels (0, 75, 150, and 225 kg.ha-1) and cytokinin (Ck) at three levels (0, 50 and 100 µmol). Results showed that intraction effect of sowing date× nitrogen× cytokinin on prolin content and SPAD value, intraction effects of nitrogen × cytokinin and sowing date × nitrogen on FLAD (Flag Leaf Area Duration), stomatal conductance and grain yield was significant. The highest grain yield was obtained from application of 150 kg.ha-1 nitrogen and 100 µmol cytokinin, however, it was not significantly different from 225 kg.ha-1 nitrogen and 100 µmol cytokinin and 150 kg.ha-1 nitrogen and 50 µmol cytokinin. It was concluded that with increasing application levels of nitrogen and cytokinin the negative effects of terminal heat stress could be mitigated.

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.